exadata-datasheet-X2-2

X3-2Eighth RackX3-2 Quarter Rack 2个数据库服务器，2个数据库服务器，每服务器包括：每服务器包括：• 2 个8核Intel® Xeon® E5-2690 处理器(2.9GHz, 每服务器激活8个核)• 2 个8核Intel® Xeon® E5-2690 处理器(2.9GHz)• 128 GB 内存(可扩展到256 GB) •512MB电池支援写缓存的磁盘控制器HBA• 128 GB 内存(可扩展到256 GB) •512MB电池支援写缓存的磁盘控制器HBA • 4个300 GB SAS 10,000RPM硬盘• 4个300 GB SAS 10,000RPM硬盘• 512MB电池支援写缓• 512MB电池支援写缓存的磁盘控制器 HBA存的磁盘控制器 HBA • 2个QDR端口• 2个QDR端口（40Gb/s）（40Gb/s）• 2个10 Gb以太网端口• 2个10 Gb以太网端口• 4个1 Gb 以太网端口• 4个1 Gb 以太网端口• 1个 ILOM 以太网端口• 1个 ILOM 以太网端口• 2个冗余热插拔电源• 2个冗余热插拔电源3个Exadata Storage Server X3-23个Exadata Storage Server X3-236 CPU cores for SQL36 CPU cores for SQL processing (18 coresprocessingenabled)2.4 TB Exadata Smart Flash Cache（12 PCI flash cards，6 cards enabled）18 x 600 GB 15,000 RPM高性能硬盘 或36 x 600 GB 15,000 RPM高性能硬盘 或18 x 3 TB 7,200 RPM36 x 3 TB 7,200 RPM 高容量盘(每台存储服务器激活6块硬盘）高容量盘2个36端口QDR (40 Gb/秒)2个36端口QDR (40 Gb/秒)InfiniBand交换机InfiniBand交换机操作系统Oracle Enterprise Linux Oracle Enterprise Linux 数据库软件Oracle DB 11g企业版Rac集群管理软件（2CPU）Oracle DB 11g企业版Rac集群管理软件（4CPU）•用于管理DatabaseMachine的以太网交换机•用于管理DatabaseMachine的以太网交换机•用于本地管理的键盘、视频或可视单元、鼠标 (KVM) 硬件•用于本地管理的键盘、视频或可视单元、鼠标 (KVM) 硬件• 42U机架包装• 42U机架包装物理尺寸：物理尺寸：• 高: 42U, 78.66英寸-1998mm• 高: 42U, 78.66英寸-1998mm • 宽: 23.62英寸 – 600mm• 宽: 23.62英寸 – 600mm • 深: 47.24英寸 – 1200mm• 深: 47.24英寸 – 1200mm 电源电源• 最大功率：2.9千瓦 (3.0千伏安)• 最大功率：3.2千瓦 (3.3 千伏安)• 额定功率(根据加载的应用而定): 2.0 千瓦 (2.1 千伏安)• 额定功率(根据加载的应用而定): 2.3 千瓦 (2.4 千伏安)重量:重量:813磅 (368.8公斤)813磅 (368.8公斤)备注内联网络附加的硬件组件环境参数Exadat计算节点/DBServer 存储服务器/StorageServer/SegmentServers 4.8TB Exadata Smart Flash Cache （12PCI flash cards）X3-2 Half RackX3-2 Full Rack 4个数据库服务器，8个数据库服务器，每服务器包括：每服务器包括：• 2 个8核Intel® Xeon® E5-2690 处理器(2.9GHz)• 2 个8核Intel® Xeon® E5-2690 处理器(2.9GHz)• 128 GB 内存(可扩展到256 GB) •512MB电池支援写缓存的磁盘控制器HBA • 128 GB 内存(可扩展到256 GB) •512MB电池支援写缓存的磁盘控制器HBA • 4个300 GB SAS 10,000RPM硬盘• 4个300 GB SAS 10,000RPM硬盘• 512MB电池支援写缓• 512MB电池支援写缓存的磁盘控制器 HBA存的磁盘控制器 HBA • 2个QDR端口• 2个QDR端口（40Gb/s）（40Gb/s）• 2个10 Gb以太网端口• 2个10 Gb以太网端口• 4个1 Gb 以太网端口• 4个1 Gb 以太网端口• 1个 ILOM 以太网端口• 1个 ILOM 以太网端口• 2个冗余热插拔电源• 2个冗余热插拔电源7个Exadata Storage Server X3-214个Exadata Storage Server X3-284 CPU cores for SQL168 CPU cores for SQL processingprocessing 84 x 600 GB 15,000 RPM高性能硬盘 或168 x 600 GB 15,000 RPM高性能硬盘或84 x 3 TB 7,200 RPM 168 x 3 TB 7,200 RPM高容量盘高容量盘3个36端口QDR (40 Gb/秒)3个36端口QDR (40 Gb/秒)InfiniBand交换机InfiniBand交换机Oracle Enterprise Linux Oracle Enterprise LinuxOracle DB 11g企业版，Rac集群管理软件（8CPU）Oracle DB 11g企业版Rac集群管理软件（16CPU）• 用于管理Database Machine的以太网交换机•用于管理Database Machine的以太网交换机•用于本地管理的键盘、视频或可视单元、鼠标 (KVM) 硬件•用于本地管理的键盘、视频或可视单元、鼠标 (KVM) 硬件• 42U机架包装• 42U机架包装物理尺寸：物理尺寸：• 高: 42U, 78.66英寸- 1998mm•高: 42U, 78.66英寸 - 1998mm • 宽: 23.62英寸 – 600mm• 宽: 23.62英寸 – 600mm • 深: 47.24英寸 – 1200mm• 深: 47.24英寸 – 1200mm 电源电源：• 最大功率：6.5千瓦 (6.6千伏安)• 最大功率：11.9千瓦 (12.1 千伏安)• 额定功率(根据加载的应用而定): 4.6 千瓦 (4.7 千伏安)• 额定功率(根据加载的应用而定): 8.4千瓦 (8.6 千伏安)重量:重量:1119磅 (543.9 公斤)1921磅 (871.4 公斤)xadata11.2TB Exadata Smart Flash Cache（28PCI flash cards）22.4TB Exadata Smart Flash Cache （56PCI flash cards）。

PHVL Supercapacitors Cylindrical packsDescriptionEaton supercapacitors are high reliability, high power, ultra-high capacitance energy storage devices utilizing electric double layer capacitor (EDLC) construction combined with proprietary materials and processes. This combination of advanced technologies allows Eaton to offera wide variety of capacitor solutions tailored to applications for backup power, pulse power and hybrid power systems.They can be applied as the sole energy storage or in combination with batteries to optimize cost, life time and run time. System requirements can range from a few microwatts to megawatts.All products feature low ESR for high power density with environmentally friendly materials for a green power solution. Eaton supercapacitors are maintenance-free with design lifetimes up to 20 years* and operating temperatures down to -40 °C and up to +85 °C..Features and benefits• Low leakage current, low self discharge • Large capacitance for high energy density • Ultra-low ESR for high power density Applications• Pulse Power• Water and gas meters• Battery assist for peak power• Especially Lithium Thionyl• IoT sensors• Long duration, low power discharges • RTC• Memory backup• Bridging or hold-up power Environmental compliancePb HALOGENHFFREE*Supercapacitor lifetimes vary based on charge voltage and temperature. See Eaton’s application guidelines or contact your local Eaton sales representative for more information on lifetime estimates2Technical Data ELX1022Effective February 2021PHVL SupercapacitorsCylindrical packs/electronicsRatingsCapacitance 0.47 F to 5.0 F Working voltage 8 3.9 V Surge voltage 85.0 VCapacitance tolerance -10% to +30% (+20 °C)Operating temperature range -40 °C to +65 °C Extended operating temperature range-40 °C to +85 °CSpecificationsCapacitance 1 (F)Verticalpart numberHorizontal part numberMaximum initial ESR 1 (Ω)Peak current 5 (A)Nominal leakage current 2 (µA)Peak power 4 (W)Stored energy 3 (mWh)Short circuit current**6 (A)0.47PHVL-3R9V474-R PHVL-3R9H474-R 0.400.77 1.09.50.9939.751.5PHVL-3R9V155-R PHVL-3R9H155-R 0.16 2.35 2.023.8 3.1724.32.5PHVL-3R9V255-R PHVL-3R9H255-R 0.08 4.06 4.047.5 5.2848.83.0PHVL-3R9V305-R PHVL-3R9H305-R 0.08 4.71 4.047.5 6.3448.85.0PHVL-3R9V505-R PHVL-3R9H505-R0.077.225.054.310.655.7** Repeated short circuit current will permanently damage the leads.PerformanceParameterCapacitance change (% of initial value)ESR(% of maximum initial value)Lifetime: (3.9 V; 2 years @ +65 °C, 5,000 hours @ +85 °C)≤ 30%≤ 200%Charge/discharge cycles 7: (500,000 at +20 °C)≤ 30%≤ 200%Storage: Low and high temperature (1000 hours @ -40 °C and +85 °C)≤ 30%≤ 200%1. Capacitance, Equivalent series resistance (ESR) and leakage current are measured according to IEC62391-12. Leakage current at +20 °C after 72 hour charge and hold.3. Stored energy (mWh) = 0.5 x V 2 x C 36004. Peak power (W) = V 2 4 x ESR5. Pulse current for 1 second from full rate voltage to half voltage.(A) = 0.5 x V x C (1 + ESR x C)6. Short circuit current is for safety information only. Do not use as operating current.7. Cycling between rated voltage and half voltage, 3 second rest at +20 °C.8. Voltage testing and verification of product under end application conditions is recommendedSafety and certificationsEnvironmental compliance RoHS, REACH, lead free, halogen free Warnings Do not overvolatgae, do not reverse polarityShippingNo restrictions, per UN3499 with all cells <10 watt-hoursx10003Technical Data ELX1022Effective February 2021PHVL Supercapacitors Cylindrical packs /electronics Part numbering systemPHVL–3R9V155-RType Family code Voltage (V) R = decimal Configuration Capacitance (μF)ValueMultiplierStandard productP = PackHVL= Product family3R9 = 3.9 VV= Vertical H= HorizontalExample 155= 15 x 105μF or 1.5 FPackaging information•Standard packaging: Bulk, 100 parts per bagPart marking• Manufacturer• Capacitance value (F) • Working voltage (V)• Family code or part number • Polarity mark•Vertical part numberHorizontal part numberA B C d’D D’E E’F PTypical mass (g)PHVL-3R9V474-R PHVL-3R9H474-R 9.017.314.50.520152520 2.011.8 2.6PHVL-3R9V155-R PHVL-3R9H155-R 9.017.3220.520152520 2.011.8 3.0PHVL-3R9V255-R PHVL-3R9H255-R 1121.3230.620152520 2.0 5.3 4.5PHVL-3R9V305-R PHVL-3R9H305-R 9.017.332.50.520152520 2.011.8 4.8PHVL-3R9V505-R PHVL-3R9H505-R1121.332.50.6201525202.0 5.36.8TolerancesMaximum± 0.02Minimum± 0.5Note: Longer lead is positiveVerticalHorizontalEatonElectronics Division 1000 Eaton Boulevard Cleveland, OH 44122United States/electronics© 2021 EatonAll Rights Reserved Printed in USAPublication No. ELX1022 BU-ELX21023February 2021PHVL SupercapacitorsCylindrical packsTechnical Data ELX1022Effective February 2021Life Support Policy: Eaton does not authorize the use of any of its products for use in life support devices or systems without the express writtenapproval of an officer of the Company. Life support systems are devices which support or sustain life, and whose failure to perform, when properly used in accordance with instructions for use provided in the labeling, can be reasonably expected to result in significant injury to the user.Eaton reserves the right, without notice, to change design or construction of any products and to discontinue or limit distribution of any products. Eaton also reserves the right to change or update, without notice, any technical information contained in this bulletin.T e m p e r a t u r eTimeT T T TWave solder profileEaton is a registered trademark.All other trademarks are property of their respective owners.Follow us on social media to get the latest product and support information.Profile feature Standard SnPb solder Lead (Pb) free solderPreheat and soak • Temperature max. (T smax )100 °C 100 °C • Time max.60 seconds 60 seconds D preheat to max Temperature160 °C max.160 °C max.Peak temperature (T P )*220 °C – 260 °C 250 °C – 260 °C Time at peak temperature (t p )10 seconds max5 seconds max each wave 10 seconds max5 seconds max each wave Ramp-down rate~ 2 K/s min ~3.5 K/s typ ~5 K/s max ~ 2 K/s min ~3.5 K/s typ ~5 K/s max Time 25 °C to 25 °C4 minutes4 minutesManual solder+350 °C (4-5 seconds by soldering iron), generally manual/hand soldering is not recommendedCleaning/WashingAvoid cleaning of circuit boards, however if the circuit board must be cleaned use static or ultrasonic immersion in a standard circuit board cleaning fluid for no more than 5 minutes and a maximum temperature of +60 °C. Afterwards thoroughly rinse and dry the circuit boards. In general, treat supercapacitors in the same manner you would an aluminum electrolytic capacitor.。

EXADATA基础知识培训前言EXADATA是一款由Oracle公司开发的高性能数据库解决方案，其强大的处理能力和可靠性使其成为现代企业在数据管理方面的首选。

本次培训将介绍EXADATA的基础知识，包括其特点、架构以及使用方法，帮助您更好地理解和应用EXADATA。

第一章：EXADATA简介1.1 EXADATA的定义EXADATA是一种集成了硬件和软件的一体化数据库解决方案。

它将强大的存储和计算能力集中在一起，并通过高速网络进行连接，实现了高性能和可扩展性。

1.2 EXADATA的特点EXADATA具备以下几个显著特点：1）高性能：EXADATA通过优化的硬件设计和数据存储方式，实现了卓越的查询和分析性能，能够处理大规模的数据请求。

2）可靠性：EXADATA采用了多层次的数据备份和容错机制，确保数据的安全性和可恢复性。

它具备故障转移和自动恢复功能，能够最大程度地减少系统故障对业务的影响。

3）可扩展性：EXADATA支持弹性扩展，可以根据业务需求灵活地增加存储和计算资源，同时保持高性能和可用性。

1.3 EXADATA的应用场景EXADATA广泛应用于大型企业和数据库密集型应用中，特别适用于以下场景：1）大数据分析：由于其卓越的性能和可扩展性，EXADATA能够支持大数据分析任务，提供快速准确的查询结果。

2）在线事务处理（OLTP）：EXADATA具备高并发处理能力，能够支持高速在线事务处理系统的运行，提供稳定可靠的服务。

3）云计算环境：EXADATA可以作为云计算平台的一部分，为不同业务提供高性能的数据存储和处理能力。

第二章：EXADATA架构2.1 EXADATA硬件架构EXADATA的硬件架构由数据库服务器和存储服务器组成。

数据库服务器负责运行数据库实例和处理查询请求，而存储服务器则负责存储数据并提供快速的读写操作。

2.2 EXADATA软件架构EXADATA的软件架构包括数据库软件、操作系统和EXADATA存储软件。

Oracle® Enterprise Manager Ops CenterEnabling Single Root Input Output Virtualization in Exalogic Elastic Cloud12c Release 1 (12.1.2.0.0)E35262-01November 2012This guide provides an end-to-end example for how to use Oracle Enterprise ManagerOps Center.IntroductionOracle Exalogic Elastic Cloud X2-2 solution includes a set of compute nodesinterconnected through QDR InfiniBand IO Fabric. In order to be able to virtualize theInfiniBand IO of Exalogic compute nodes, the Single Root Input Output Virtualization(SR-IOV) option must be enabled in BIOS.After compute node ILOM and BIOS is updated, the BIOS configuration settings of theExalogic node are set to default, leaving the SR-IOV settings disabled. For properfunctioning of the appliance, this option has to be re-enabled. You can change theSR-IOV settings in BIOS using the following procedures.■Enabling Single-Root Input Output Virtualization Using Oracle EnterpriseManager Ops Center UI■Enabling Single-Root Input Output Virtualization using ILOM CLI CommandsBoth these procedures are explained in this document.What You Will NeedYou will need the following to enable single-root input output virtualization:■ A configured Enterprise Controller■Oracle Exalogic Elastic Cloud (version 2.2 or later) installed on Oracle EnterpriseManager Ops Center■Ensure popup is enabled on the web browser■You must have the role of System Admin to enable SR-IOV actions■Login credentials to login to ILOM (administrative login credentials)Enabling Single-Root Input Output Virtualization Using OracleEnterprise Manager Ops Center UIIf Oracle Enterprise Manager Ops Center is available and fully functional, you can usethis procedure to enable single-root IO virtualization through the Oracle EnterpriseManager Ops Center UI.1.On the Navigation pane, under Assets, select a Server.2.On the Actions pane, click Launch LOM Controller. The web-based ILOM loginscreen for the asset opens.3.Enter the User Name and Password (Admin login credentials for the serviceprocessor of the asset) and click Log In.4.After logging in, click Remote Control, then click Host Control.5.In the Next Boot Device field, select BIOS.6.Click Save.7.Click the Logout button on the top right corner of the screen to logout of LOMController.■The server moves into locked state indicated by a padlock on the OS of the server.8.In the Navigation pane, under Assets, expand the Server node that you have justedited and select the hypervisor node under it.9.On the Actions pane, click Reboot Oracle VM Server Host.10.Click Reboot Oracle VM Server. The VM server is rebooted.11.On the Navigation pane, under Assets, select the server.12.In the center pane, click the Console tab, then click the Enable Console Connectionicon.■Wait until the job is complete. The BIOS menu opens.13.In the BIOS menu, using arrow keys, select Advanced, then select I/OVirtualization.14.Change the SR-IOV Supported value to Enabled.15.Press Esc key to go back to the Main menu. Using the arrow key, select Exit.16.Click OK to save the changes and exit.■The server reboots and the Operating System is started. This might take a few minutes. After the server has rebooted, the padlock icon on the OS disappearsand the OS is ready to host the virtual guests.17.Click Disable the Console Connection icon to disable the console.Enabling Single-Root Input Output Virtualization using ILOM CLI CommandsIf Oracle Enterprise Manager Ops Center is not installed, you can enable SR-IOV using ILOM CLI commands.1.Login to the ILOM console using SSH and your admin login credentials.2.Type ssh root@<xxx.xx.xx.x> to log in to the ILOM console (xxx.xx.xx.xx is the IP ofthe ILOM).Run the following commands after logging in to the server’s LDOM CLI console.1.Type set /HOST boot_device=BIOS .2.Type reset /SYS .3.Type start /SP/console .■It might take a few minutes for the BIOS menu to appear.4.In the BIOS menu, using arrow keys, select Advanced, then select I/O Virtualization.5.Change the SR-IOV Supported value to Enabled.6.Press Esc key to go back to the Main menu. Using the arrow key, select Exit.7.Click OK to save the changes and exit.The server reboots and the Operating System is started. This might take a fewminutes. After the server has rebooted, the padlock icon on the OS disappears and the OS is ready to host the virtual guests.Related Articles and ResourcesThe following chapter in the Oracle Enterprise Manager Ops Center Feature Reference Guide contains more information:Note:The ILOM CLI console IP address is read from the ECUconfiguration spreadsheet.■Oracle Exalogic Elastic CloudSee the How To library at/pls/topic/lookup?ctx=oc121&id=howtoDocumentation AccessibilityFor information about Oracle's commitment to accessibility, visit the Oracle Accessibility Program website at/pls/topic/lookup?ctx=acc&id=docacc.Access to Oracle SupportOracle customers have access to electronic support through My Oracle Support. For information, visit /pls/topic/lookup?ctx=acc&id=info or visit /pls/topic/lookup?ctx=acc&id=trs if you are hearing impaired.Oracle Enterprise Manager Ops Center Enabling Single Root Input Output Virtualization in Exalogic Elastic Cloud, 12c Release 1 (12.1.2.0.0)E35262-01Copyright © 2007, 2012, Oracle and/or its affiliates. All rights reserved.This software and related documentation are provided under a license agreement containing restrictions on use and disclosure and are protected by intellectual property laws. Except as expressly permitted in your license agreement or allowed by law, you may not use, copy, reproduce, translate, broadcast, modify, license, transmit, distribute, exhibit, perform, publish, or display any part, in any form, or by any means. Reverse engineering, disassembly, or decompilation of this software, unless required by law for interoperability, is prohibited.The information contained herein is subject to change without notice and is not warranted to be error-free. If you find any errors, please report them to us in writing.If this is software or related documentation that is delivered to the U.S. Government or anyone licensing it on behalf of the U.S. Government, the following notice is applicable:U.S. GOVERNMENT END USERS: Oracle programs, including any operating system, integrated software, any programs installed on the hardware, and/or documentation, delivered to U.S. Government end users are "commercial computer software" pursuant to the applicable Federal Acquisition Regulation and agency-specific supplemental regulations. As such, use, duplication, disclosure, modification, and adaptation of the programs, including any operating system, integrated software, any programs installed on the hardware, and/or documentation, shall be subject to license terms and license restrictions applicable to the programs. No other rights are granted to the U.S. Government.This software or hardware is developed for general use in a variety of information management applications. It is not developed or intended for use in any inherently dangerous applications, including applications that may create a risk of personal injury. If you use this software or hardware in dangerous applications, then you shall be responsible to take all appropriate fail-safe, backup, redundancy, and other measures to ensure its safe use. Oracle Corporation and its affiliates disclaim any liability for any damages caused by use of this software or hardware in dangerous applications. 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Exadata管理 (3)Exadata性能优化 (3)让表使用flash cache (3)可以使用如下公式计算Exadata特性对IO的优化 (3)可以使用如下公式计算Exadata Storage Index对Disk IO减少的共享 (3)可以使用如下计算Flash Cache的使用率 (3)收集cell级别的表缓存统计信息的方法 (3)确认在使用write back flash cache (4)确认所有的griddisk均为正常online状态 (4)确认所有的flashdisk均为正常online状态 (4)启用write back flash cache的方法 (4)确认Exadata 计算节点间的网络带宽 (6)检测多个ORACLE_HOME是否RDS可用？ (6)relink ORACLE_HOME的RDS (6)不同配置Exadata的推荐最大并行度 (6)Exadata EHCC支持 (6)Exadata 压缩信息 (6)针对写日志redo特别多的应用建议启用Smart Flash logging特性 (6)Exadata DB管理 (7)Exadata存储空间计算 (7)查看cell软件版本 (7)了解cell的温度 (7)cell存储节点的日志存放位置 (7)列出cell中的alert history (7)为cell创建一个告警阈值 (8)cell可用性监控 (8)如何禁用Smart Scan? (8)如何禁用storage index? (8)如何禁用flash cache? (8)cell相关的数据库视图有以下这些视图 (8)配置Inter-Database IORM (8)如何禁用布隆过滤Bloom Fliter (9)Exadata数据备份 (9)backup备份速率 (9)recovery应用日志恢复速率 (9)standby database搭建 (9)Exadata恢复 (9)cell 救护 (9)Exadata部署 (10)onecommand下载 (10)Exadata安装前准备工作 (10)环境检查 (10)验证网络连通性 (10)Exadata监控 (11)exachk健康检查脚本 (12)Exadata文档信息 (12)Exadata硬件篇 (12)常规 (12)默认密码，以下是Exadata中cell/db node IB等的默认密码： (12)硬件常规巡检： (12)检测Exadata数据库机器上的硬件和固件版本是否匹配？ (13)检测软件版本与平台是否匹配？ (13)为cell启用告警 (13)监控磁盘故障 (13)更换Storage Cell硬盘 (13)观察Database Server 磁盘状态 (14)观察Database Server RAID状态 (14)Storage Cell加电启动 (14)检测memory ECC错误 (14)若发现Exadata上存在磁盘损毁则： (14)检测 cell server Cache Policy (14)Exadata 停机： (16)Exadata 启动 (16)Infiniband篇 (16)启停IBSwitch (17)检查IB链路状态 (17)查看IB网络拓扑状态 (17)诊断IB链路没有错误 (17)查看IB网络连线 (17)查看IB健康状态 (18)IB健康检查 (18)IB故障处理 (18)IB硬件监控 (18)Switch端口错误 (18)Link状态 (18)Subnet manager (19)CISCO交换机 (19)例行维护操作 (19)KVM (19)PDU (19)故障处理 (19)Exadata管理Exadata性能优化让表使用flash cacheALTER TABLE <object name> storage (CELL_FLASH_CACHE KEEP);可以使用如下公式计算Exadata特性对IO的优化[ 1 – {(cell physical IO interconnect bytes returned by smart scan)/ (cell IO uncompressed bytes + cell physical IO bytes saved by storage index)} ] * 100可以使用如下公式计算Exadata Storage Index对Disk IO减少的共享(cell physical IO bytes saved by storage index / physical read total bytes) * 100可以使用如下计算Flash Cache的使用率(cell flash cache read hit / physical read total IO requests) * 100 收集cell级别的表缓存统计信息的方法SQL> SELECT data_object_id FROM DBA_OBJECTS WHERE object_name=’EMP'; OBJECT_ID———57435CellCLI> LIST FLASHCACHECONTENT –WHERE objectNumber=57435 DETAIL cachedSize: 495438874dbID: 70052hitCount: 415483missCount: 2059objectNumber: 57435tableSpaceNumber: 1确认在使用write back flash cache#dcli -g ~/cell_group -l root cellcli -e “list cell attributes flashcachemode”Results:flashCacheMode: WriteBack -> write back flash cache is enabled flashCacheMode: WriteThrough -> write back flash cache is not enabled确认所有的griddisk均为正常online状态# dcli -g cell_group -l root cellcli -e list griddisk attributes asmdeactivationoutcome, asmmodestatus确认所有的flashdisk均为正常online状态# dcli -g cell_group -l root cellcli -e list flashcache detail启用write back flash cache的方法A. Enable Write Back Flash Cache using a ROLLING method(RDBMS & ASM instance is up – enabling write-back flashcache one cell at a time)Log onto the first cell that you wish to enable write-back FlashCache1. Drop the flash cache on that cell# cellcli -e drop flashcache2. Check if ASM will be OK if the grid disks go OFFLINE. The following command should return ‘Yes’ for the grid disks being listed:# cellcli -e list griddisk attributesname,asmmodestatus,asmdeactivationoutcome3. Inactivate the griddisk on the cell# cellcli –e alter griddisk all inactive4. Shut down cellsrv service# cellcli -e alter cell shutdown services cellsrv5. Set the cell flashcache mode to writeback# cellcli -e “alter cell flashCacheMode=writeback”6. Restart the cellsrv service# cellcli -e alter cell startup services cellsrv7. Reactivate the griddisks on the cell# cellcli –e alter griddisk all active8. Verify all grid disks have been successfully put online using the following command:# cellcli -e list griddisk attributes name, asmmodestatus9. Recreate the flash cache# cellcli -e create flashcache all10. Check the status of the cell to confirm that it’s now in WriteBack mode:# cellcli -e list cell detail | grep flashCacheMode11. Repeat these same steps again on the next cell. However, before taking another storage server offline, execute the following making sure‘asmdeactivationoutcome’ displays YES:# cellcli -e list griddisk attributesname,asmmodestatus,asmdeactivationoutcomeB . Enable Write Back Flash Cache using a NON-ROLLING method (RDBMS & ASM instances are down while enabling write-back flashcache)1. Drop the flash cache on that cell# cellcli -e drop flashcache2. Shut down cellsrv service# cellcli -e alter cell shutdown services cellsrv3. Set the cell flashcache mode to writeback# cellcli -e “alter cell flashCacheMode=writeback”4. Restart the cellsrv service# cellcli -e alter cell startup services cellsrv5. Recreate the flash cache# cellcli -e create flashcache all确认Exadata 计算节点间的网络带宽可以采用nc nc-1.84-10.fc6.x86_64.rpm获得检测多个ORACLE_HOME是否RDS可用？dcli -g /opt/oracle.SupportTools/onecommand/dbs_group -l oracle md5sum ${ORACLE_HOME}/lib/libskgxp11.sorelink ORACLE_HOME的RDSdcli -g /opt/oracle.SupportTools/onecommand/dbs_group -l oracle “export ORACLE_HOME=$ORACLE_HOME;;cd `pwd`;;make – f i*mk ipc_rds”dcli -g /opt/oracle.SupportTools/onecommand/dbs_group -l oracle “export ORACLE_HOME=$ORACLE_HOME;;cd `pwd`;;make – f i*mk ioracle” | egrep‘rm|mv.*oracle’不同配置Exadata的推荐最大并行度配置CPU个数推荐最大Parallelism Full Rack64 core DOP=256Half Rack32 core DOP=128Quarter Rack16 core DOP=64Exadata EHCC支持Exadata的EHCC支持宽表最大支持1000个字段的表，而不像11.1中的压缩仅支持最多255列的表Exadata 压缩信息通过dbms_compression.get_compression_ratio 可以获得表的压缩信息针对写日志redo特别多的应用建议启用Smart Flash logging特性CREATE FLASHLOG ALLCREATE FLASHLOG ALL SIZE=1GCREATE FLASHLOG CELLDISK=’fd1,fd2′CREATE FLASHLOG CELLDISK=’fd1,fd2′ SIZE=1GExadata DB管理Exadata存储空间计算FreeMB(最大可用空间) =GridDisk*12*Num of Cells/RedundancyUsableMB (支持1个CELL故障的最大可用空间) =GridDisk*12*(Num of Cells – 1) /Redundancy查看cell软件版本imagehistoryimageinfo了解cell的温度dcli -g cell_group -l root “ipmitool sensor | grep ‘Inlet Amb Temp'”cell存储节点的日志存放位置$ADR_BASE/diag/asm/cell/`hostname`/trace/alert.log$ADR_BASE/diag/asm/cell/`hostname`/trace/ms-odl.*$ADR_BASE/diag/asm/cell/`hostname`/trace/svtrc__0.trc — ps -ef | grep “cellsrv 100″ $ADR_BASE/diag/asm/cell/`hostname`/incident/*/var/log/messages*, dmesg /var/log/sa/*/var/log/cellos/*列出cell中的alert historylist alerthistory where notificationState like ‘[023]’ and severity like ‘[warning|critical]’ and examinedBy = NULL;为cell创建一个告警阈值cellclicreate threshold CD_IO_ERRS_MIN warning=1, comparison=’>=’, occurrences=1, observation=1;cell可用性监控一般建议使用 EMGC Oracle Exadata Storage Server Management Plug-In 监控如何禁用Smart Scan?设置 Cell_offload_processing=false如何禁用storage index?设置 _kcfis_storageidx_disabled=true如何禁用flash cache?11.2.0.2 以后设置_kcfis_keep_in_cellfc_enabled=false11.2.0.1中设置_kcfis_control1=1cell相关的数据库视图有以下这些视图select * from sys.GV_$CELL_STATE;select * from sys.GV_$CELL;select * from sys.GV_$CELL_THREAD_HISTORY;select * from sys.GV_$CELL_REQUEST_TOTALS;select * from sys.GV_$CELL_CONFIG;配置Inter-Database IORMCellCLI> alter iormplan –dbplan = ((name = production, level = 1, allocation = 100), –(name = test, level = 2, allocation = 80), –(name = other, level = 2, allocation = 20))IORMPLAN successfully alteredCellCLI> alter iormplan activeIORMPLAN successfully alteredCellCLI> list iormplan detailname: cell4_IORMPLANcatPlan:dbPlan: name=production,level=1,allocation=100name=test,level=2,allocation=80name=other,level=2,allocation=20status: active如何禁用布隆过滤Bloom Fliter设置_bloom_pruning_enabled=falseExadata数据备份backup备份速率Exadata下rman备份的速率从1通道到8通道大约为1003MB/s 到 2081MB/s，视乎配置不同也略微有区别recovery应用日志恢复速率exadata recovery的速率大约为每秒600~1000MB/s的归档日志standby database搭建对于50TB的standby database搭建，若使用infiniband + 4rman通道大约耗费5.5小时，若使用GigE则在18个小时左右Exadata恢复cell 救护可以通过 /opt/oracle.SupportTools/make_cellboot_usb脚本创建部USB cellboot_usb_in_rescure_modeExadata部署onecommand下载可以下载patch (9935478) ONECOMMAND FOR Exadata 11gR2Exadata安装前准备工作1. 下载安装介质包括Grid, Database,Patches等2. 硬件设备到货验收并安装就绪3. 规划DBM用的管理网，生产网，ILOM等用的网段和IP地址4. 配置DNS服务器5. 将IP地址和域名注册到DNS服务器6. 配置NTP服务器7. 网络连线环境检查1. 检查DBM主机的eth0网卡是否可以通过cisco交换机被访问2. 检查hardware and firmware profile是否正确3. 验证InfiniBand Network验证网络连通性1.登陆第一台数据库服务器使用sh脚本验证网络连通性2.验证DNS是否正常3.验证NTP 服务器是否正常安装Exadata Storage Server Image Patch (root user)1. 在db server和cell server上为root用户配置SSH# /opt/oracle.SupportTools/onecommand/setssh.sh -s -u root -p password -n N -h dbs_group2. 检查当前Cell storage server的Exadata Image 版本3. 安装最新的Patch具体步骤详见Readme4. 验证当前Exadata Image version#cd /opt/oracle.SupportTools/firstconf#dcli -l root -g quarter ‘imagehistory | grep –i Version使用OneCommand工具完成DBM的配置安装1. #cd /opt/oracle.SupportTools/onecommand2. Display the onecommand steps# ./deploy112.sh -i –l3. The steps in order are…Step 0 = ValidateThisNodeSetupStep 1 = SetupSSHForRootStep 2 = ValidateAllNodesStep 3 = UnzipFilesStep 4 = UpdateEtcHostsStep 5 = CreateCellipnitoraStep 6 = ValidateHWStep 7 = ValidateIBStep 8 = ValidateCellStep 9 = PingRdsCheckStep 10 = RunCalibrateStep 11 = ValidateTimeDateStep 12 = UpdateConfigStep 13 = CreateUserAccountsStep 14 = SetupSSHForUsersStep 15 = CreateOraHomesStep 16 = CreateGridDisksStep 17 = InstallGridSoftwareStep 18 = RunGridRootScriptsStep 19 = Install112DBSoftwareStep 20 = Create112ListenerStep 21 = RunAsmCaStep 22 = UnlockGIHomeStep 23 = UpdateOPatchStep 24 = ApplyBPStep 25 = RelinkRDSStep 26 = LockUpGIStep 27 = SetupCellEmailAlertsStep 28 = RunDbcaStep 29 = SetupEMDbControlStep 30 = ApplySecurityFixesStep 31 = ResecureMachineTo run a command#./deploy112.sh –i –s NWhere N corresponds to a step number Example to run step 0Exadata监控exachk健康检查脚本exachk脚本可以以daemon形式后台运行./exachk –d start以daemon形式cluster support运行./exachk –clusternodes [node1,[node N]] –d start! Exadata文档信息Exadata的官方文档 docs.oracle./cd/E50790_01/welcome.html另外文档还保存在您cell 的 /opt/oracle/cell/doc/ 目录下。

月 8年2012．1 前言 (3)一Exadata 概述 (4)1Exadata简介 (4)2Exadata的配置及性能参数 (4)二Exadata特性 (5)1Smart Scan（智能扫描） (5)2Storage Index（存储索引） (14)3Flash Cache（智能闪存） (24)4Compression（压缩） & EHCC（Exadata Hybrid Columnar Compression） 285IORM（IO资源管理） (34)三Exadata监控 (37)1Exadata特性监控常用指标 (37)2如何查看指标 (38)四如何应用Exadata (38)1Exadata参数调整 (38)2在Exadata上开发注意事项 (38)413 ................................................... 应用总结42........................................... 总体总结4. Exadata前言1本文背景1.1前期东软-甲骨文公司组织了一次针对社保系统的Exadata联合应用测试，本文内容是本次Exadata测试的经验总结，其中包含了与Oracle技术人员交流经验应用、Oracle相关技术文档应用及个人测试经验总结。

本文简介1.2本文是关于ORACLE Exadata的一些特性介绍和应用Exadata的一些指南；本文不会涉及太多传统ORACLE DataBase已经具有的而非Exadata专有的一些特性介绍。

通过本文，读者可以了解ORACLE推出 Exadata的目的和初衷，简单了解Exadata 架构体系，了解Exdata的一些设计思路，了解其特性及其原理；了解Exadata 的适合应用场景，不适合应用场景，以及在Exadata下开发的一些注意事项（尤其是做Exadata项目主要设计、开发人员一定要了解Exadata，不要把它完全当作传统ORACLE数据库）。

Exadata系统检测维护⽂档xxxx技术服务有限公司xxxxExadata数据库健康检查报告作者:xxxx创建⽇期:2014年x⽉xx⽇最后修改⽇期: 2014年x⽉xx⽇1 ⽂档控制1.1 修改记录1.2 分发者2 ⽬录1 ⽂档控制 ................................................................................................................... I I 1.1修改记录. (II)1.2分发者 (II)2 ⽬录.......................................................................................................................... I II3 检查总结 (5)3.1概要 (5)3.2建议 (5)4 介绍 (6)4.1⽬标 (6)4.2检查⽅法 (6)4.3检查范围 (6)5 EXADATA配置概要 (7)6 计算节点检查 (7)6.1硬件检查 (8)6.1.1 物理磁盘驱动器配置 (8)6.1.2 磁盘状态 (9)6.1.3 RAID控制器电池 (9)6.1.4 以太⽹⽹络连接 (10)6.1.5 IB私⽹⽹络连接 (10)6.1.6 RAID控制器电池温度 (11)6.1.7 磁盘控制器写⼊模式 (11)6.2操作系统配置检查 (12)6.2.1 hugepages配置 (12)6.2.2 OSwatcher运⾏情况 (13)6.2.3 Shell Limit配置情况 (14)6.2.4 集群RDS协议配置 (14)6.2.5 NUMA功能配置 (15)6.2.6 关闭SELinux (15)6.2.7 内核参数配置 (16)6.2.8 ILOM配置 (16)6.2.9 关闭磁盘的cache策略 (17)7 存储节点检查 (17)7.1硬件检查 (18)7.1.1 RAID控制器电池温度 (18)7.1.2 Flash disk状态 (18)7.1.3 Hard disk状态 (20)7.1.4 关闭磁盘cache策略 (21)7.2存储软件配置检查 (22)7.2.1 存储节点ipconf⽹络配置 (22)7.2.2 Smart Flash log 是否创建 (24)8 IB交换机检查 (26)8.1.1 ⼦⽹管理器是否运⾏ (26)9 数据库配置 (26)9.1数据库版本 (26)9.2数据库初始化参数 (26)9.3控制⽂件 (28)9.4联机⽇志(O NLINE R EDO L OG) (28) 9.5数据⽂件管理(包括临时⽂件) (29) 9.6表空间管理 (32)9.7回滚段 (33)9.8数据库对象管理 (33)9.9JOB管理 (34)9.10安全性管理 (34)9.11D ISK G ROUP空间管理 (35)10 数据库集群状态 (36)10.1集群状态检查 (36)U SING: CRSCTL CHECK CRS (36)10.2OCR检查 (36)U SING: OCRCHECK (36)10.3VOTTE DISK检查 (37)U SING: CRSCTL QUERY CSS VOTEDISK (37)10.4CRS软件版本 (37)U SING: CRSCTL QUERY CRS ACTIVEVERSION (37)10.5集群资源检查 (38)U SING: CRSCTL STATUS RESOURCE -T (38)11 备份与恢复 (40)11.1备份 (40)11.2恢复 (40)12 数据库性能 (41)12.1系统负载情况 (41)12.2⽐较消耗资源的SQL语句 (42)12.3E XADATA上索引情况 (42)3 检查总结3.1 概要此次数据库检查包括以下内容：如果⼯程师在检查中发现ORACLE配置或性能⽅⾯的问题，我们将对检查范围内的情况进⾏记录，并提出建议。

X3-2Eighth RackX3-2 Quarter Rack 2个数据库服务器，2个数据库服务器，每服务器包括：每服务器包括：• 2 个8核Intel® Xeon® E5-2690 处理器(2.9GHz, 每服务器激活8个核)• 2 个8核Intel® Xeon® E5-2690 处理器(2.9GHz)• 128 GB 内存(可扩展到256 GB) •512MB电池支援写缓存的磁盘控制器HBA• 128 GB 内存(可扩展到256 GB) •512MB电池支援写缓存的磁盘控制器HBA • 4个300 GB SAS 10,000RPM硬盘• 4个300 GB SAS 10,000RPM硬盘• 512MB电池支援写缓• 512MB电池支援写缓存的磁盘控制器 HBA存的磁盘控制器 HBA • 2个QDR端口• 2个QDR端口（40Gb/s）（40Gb/s）• 2个10 Gb以太网端口• 2个10 Gb以太网端口• 4个1 Gb 以太网端口• 4个1 Gb 以太网端口• 1个 ILOM 以太网端口• 1个 ILOM 以太网端口• 2个冗余热插拔电源• 2个冗余热插拔电源3个Exadata Storage Server X3-23个Exadata Storage Server X3-236 CPU cores for SQL36 CPU cores for SQL processing (18 coresprocessingenabled)2.4 TB Exadata Smart Flash Cache（12 PCI flash cards，6 cards enabled）18 x 600 GB 15,000 RPM高性能硬盘 或36 x 600 GB 15,000 RPM高性能硬盘 或18 x 3 TB 7,200 RPM36 x 3 TB 7,200 RPM 高容量盘(每台存储服务器激活6块硬盘）高容量盘2个36端口QDR (40 Gb/秒)2个36端口QDR (40 Gb/秒)InfiniBand交换机InfiniBand交换机操作系统Oracle Enterprise Linux Oracle Enterprise Linux 数据库软件Oracle DB 11g企业版Rac集群管理软件（2CPU）Oracle DB 11g企业版Rac集群管理软件（4CPU）•用于管理DatabaseMachine的以太网交换机•用于管理DatabaseMachine的以太网交换机•用于本地管理的键盘、视频或可视单元、鼠标 (KVM) 硬件•用于本地管理的键盘、视频或可视单元、鼠标 (KVM) 硬件• 42U机架包装• 42U机架包装物理尺寸：物理尺寸：• 高: 42U, 78.66英寸-1998mm• 高: 42U, 78.66英寸-1998mm • 宽: 23.62英寸 – 600mm• 宽: 23.62英寸 – 600mm • 深: 47.24英寸 – 1200mm• 深: 47.24英寸 – 1200mm 电源电源• 最大功率：2.9千瓦 (3.0千伏安)• 最大功率：3.2千瓦 (3.3 千伏安)• 额定功率(根据加载的应用而定): 2.0 千瓦 (2.1 千伏安)• 额定功率(根据加载的应用而定): 2.3 千瓦 (2.4 千伏安)重量:重量:813磅 (368.8公斤)813磅 (368.8公斤)备注内联网络附加的硬件组件环境参数Exadat计算节点/DBServer 存储服务器/StorageServer/SegmentServers 4.8TB Exadata Smart Flash Cache （12PCI flash cards）X3-2 Half RackX3-2 Full Rack 4个数据库服务器，8个数据库服务器，每服务器包括：每服务器包括：• 2 个8核Intel® Xeon® E5-2690 处理器(2.9GHz)• 2 个8核Intel® Xeon® E5-2690 处理器(2.9GHz)• 128 GB 内存(可扩展到256 GB) •512MB电池支援写缓存的磁盘控制器HBA • 128 GB 内存(可扩展到256 GB) •512MB电池支援写缓存的磁盘控制器HBA • 4个300 GB SAS 10,000RPM硬盘• 4个300 GB SAS 10,000RPM硬盘• 512MB电池支援写缓• 512MB电池支援写缓存的磁盘控制器 HBA存的磁盘控制器 HBA • 2个QDR端口• 2个QDR端口（40Gb/s）（40Gb/s）• 2个10 Gb以太网端口• 2个10 Gb以太网端口• 4个1 Gb 以太网端口• 4个1 Gb 以太网端口• 1个 ILOM 以太网端口• 1个 ILOM 以太网端口• 2个冗余热插拔电源• 2个冗余热插拔电源7个Exadata Storage Server X3-214个Exadata Storage Server X3-284 CPU cores for SQL168 CPU cores for SQL processingprocessing 84 x 600 GB 15,000 RPM高性能硬盘 或168 x 600 GB 15,000 RPM高性能硬盘或84 x 3 TB 7,200 RPM 168 x 3 TB 7,200 RPM高容量盘高容量盘3个36端口QDR (40 Gb/秒)3个36端口QDR (40 Gb/秒)InfiniBand交换机InfiniBand交换机Oracle Enterprise Linux Oracle Enterprise LinuxOracle DB 11g企业版，Rac集群管理软件（8CPU）Oracle DB 11g企业版Rac集群管理软件（16CPU）• 用于管理Database Machine的以太网交换机•用于管理Database Machine的以太网交换机•用于本地管理的键盘、视频或可视单元、鼠标 (KVM) 硬件•用于本地管理的键盘、视频或可视单元、鼠标 (KVM) 硬件• 42U机架包装• 42U机架包装物理尺寸：物理尺寸：• 高: 42U, 78.66英寸- 1998mm•高: 42U, 78.66英寸 - 1998mm • 宽: 23.62英寸 – 600mm• 宽: 23.62英寸 – 600mm • 深: 47.24英寸 – 1200mm• 深: 47.24英寸 – 1200mm 电源电源：• 最大功率：6.5千瓦 (6.6千伏安)• 最大功率：11.9千瓦 (12.1 千伏安)• 额定功率(根据加载的应用而定): 4.6 千瓦 (4.7 千伏安)• 额定功率(根据加载的应用而定): 8.4千瓦 (8.6 千伏安)重量:重量:1119磅 (543.9 公斤)1921磅 (871.4 公斤)xadata11.2TB Exadata Smart Flash Cache（28PCI flash cards）22.4TB Exadata Smart Flash Cache （56PCI flash cards）。

Shenzhen EAI Technology Co.,Ltd.DOC#:01.13.000100 X2DATA SHEETCONTENTS1PRODUCT OVERVIEW (1)1.1Product Features (1)1.2Applications (1)1.3Installation and Dimensions (1)2SPECIFICATIONS (2)2.1Performance Parameter (2)2.2Electrical Parameter (3)2.3Interface Definition (3)2.4Data Communication (3)2.5Motor Control (4)2.6Optical Characteristic (4)2.7Polar Coordinate System Definition (4)2.8Others (5)3DEVELOPMENT AND SUPPORT (5)4REVISE (6)1 PRODUCT OVERVIEWYDLIDAR X2 is a 360 degrees 2D LiDAR (hereinafter referred to as X2) developed by EAI team. Based on the principle of Triangulation, it is equipped with related optics, electricity, and algorithm design to achieve high-frequency and high-precision distance measurement. The mechanical structure rotates 360 degrees to continuously output the angle information as well as the point cloud data of the scanning environment while ranging.1.1 Product Features➢360 degrees scan ranging➢High accuracy, stable performance➢Wide measuring range➢Strong resistance to ambient light interference➢Low power consumption, small size, stable performance and long service life➢Class I eye safety➢Motor speed adjustable, the proposed speed is 6Hz➢Ranging frequency up to 3kHz1.2 Applications➢Robot navigation and obstacle avoidance➢Robot ROS teaching and research➢Regional security➢Environmental scanning and 3D reconstruction➢Navigation and obstacle avoidance of home robots/ robot vacuum cleaners1.3 Installation and DimensionsFIG 1 YDLIDAR X2 FRONT STRUCTURE SIZEFIG 2 YDLIDAR X2 MECHANICAL DIMENSIONS2 SPECIFICATIONS2.1 Performance ParameterCHART 1 YDLIDAR X2 PERFORMANCE PARAMETERNote 1: It is factory FQC standard value, 80% reflectivity material object.Note 2: The relative error value indicates the accuracy of the Lidar measurement. Relative error (mean value) = (average measured distance-actual distance)/actual distance *100%, sample size: 100pcs.Note 3: Lidar is a precision device, please avoid using Lidar under high or low temperature or strong vibration situation, the relative error parameter index will be relatively larger, and it may exceed the typical value.2.2 Electrical ParameterCHART 2 YDLIDAR X2 ELECTRICAL PARAMETERItem Min Typical Max Unit RemarksSupply voltage 4.8 5 5.2 V Excessive voltage might damage the Lidar while low affect normal performance Supply current 1000 / / mA Instantaneous peak current atstart-up Working current/300500mASystem work, motor rotation2.3 Interface DefinitionX2 provides MX1.25-4P receptacle to realize power and data communication function.FIG 3 YDLIDAR X2 INTERFACESCHART 3 YDLIDAR X2 INTERFACE DEFINITIONPin Type Description Defults Range RemarksVCC Power supply Positive 5V 4.8V-5.2V/Tx Output System serial portoutput/ / Data stream: LiDAR PeripheralsGND Power supply Negative 0V 0V /M_CTRInputMotor speed controlterminal1.8V0V-3.3VVoltage speed regulation or PWM speed regulation2.4 Data CommunicationWith a 3.3V level serial port (UART), users can connect the external system and the product through the physical interface. After that, you can obtain the real-time scanned point cloud data, device information as well as device status. The communication protocol of parameters are as follows:CHART 4 YDLIDAR X2 SERIAL SPECIFICATIONItem Min Typical Max Unit RemarksBaud rate / 115200 / bps 8-bit data bit,1 stop bit, noparityHigh signal level 2.4 3.3 3.5 V / Low signal level0.6V/VCCTx GND M_CTR2.5 Motor ControlX2 has its own motor driver with motor speed control function. The peripheral can control the X2 motor by inputting control signals through the M_CTR pin in the interface.M_CTR is the motor speed control signal, which can be adjusted by voltage and can also be debugged by PWM wave. The higher the voltage/the greater the PWM duty cycle, the higher the motor speed.Among them, the PWM signal of M_CTR has the following requirements:CHART 5 YDLIDAR X2 MOTOR PWM SIGNAL SPECIFICATION2.6 Optical CharacteristicX2 uses an infrared laser that meets FDA Class I eye safety standards. The laser and optical lens finish the transmission and reception of the laser signal to achieve high-frequency ranging while working. To ensure system ranging performance, please keep the laser and optical lens clean. The detailed optical parameters are as follows:CHART 6 YDLIDAR X2 LASER OPTICAL PARAMETERS2.7 Polar Coordinate System DefinitionIn order to facilitate secondary development, X2 internally defines a polar coordinate system. The polar coordinates of the system take the center of the rotating core of X2 as the pole, and the specified Angle is positive clockwise. The zero Angle is located directly in front of the X2 motor. Due to individual differences, there is a deviation of plus or minus 3 degrees, as shown in the figure:FIG 4 YDLIDAR X2 POLAR COORDINATE SYSTEM DEFINITION2.8 OthersCHART 7 YDLIDAR X2 OTHERSItem Min Typical Max Unit Remarks Operating temperature 0 20 40 ℃ No condensation Storage temperature -10 / 60 ℃ With package Lighting environment 0 550 2000 Lux For reference onlyweight/126/gN.W.3 DEVELOPMENT AND SUPPORTX2 provides a wealth of software interfaces, which can realize the motor enablingcontrol, speed control, range unit enabling control and output control of the system. On this basis, users can also implement the power control and scan control purpose.Also, the 3D model of X2 is disclosed. YDLIDAR provides the graphics debugging Workstation under Windows, as well as the corresponding SDK and ROS development kit to users, which could be downloaded from our website: https:///.In order to facilitate user s’ development, X2 development manual, SDK development manual and ROS user manual are also provided. Please download them from our website.Pole Pole axis0°~360°,clockwise is positiveZero direction4 REVISE。