问题产生 服务器重启,导致cassandra损坏,整个集群不可用.所使用的cassandra为2.1.9版本. 问题描述 运行启动命令,报错如下: DEBUG :: All segments have been unmapped successfully INFO :: Opening ./../data/data/system/size_estimates-618f817b005f3678b8a453f3930b8e86/system-size_estimates-ka- ( bytes) E

x=y x_+_y=0 The bit in any position is the modulo-2 sum of all the bits in the corresponding positions of all other disks.

环境:RHEL5.8 RAC 11.2.0.3.0 1:查看ORC和voting disk信息: In 11g Release 2 your voting disk data is automatically backed up in the OCR whenever there is a configuration change. 所以恢复时恢复备份OCR即可,这里和10g是不同的,不需要备份voting disk,备份OCR即可 2:使用cluvfy 工具检查OCR完整性 [grid@rac

HDFS Architecture HDFS Architecture(HDFS 架构) Introduction(简介) Assumptions and Goals(假设和目标) Hardware Failure(硬件失效是常态) Streaming Data Access(支持流式访问) Large Data Sets(大数据集) Simple Coherency Model(简单一致性模型) "Moving Computation is Cheaper than Moving Data&q

本系列文章着重学习和研究OpenStack Swift,包括环境搭建.原理.架构.监控和性能等. (1)OpenStack + 三节点Swift 集群+ HAProxy + UCARP 安装和配置 (2)原理.架构和性能 (3)监控 1. 架构 1.1 总体架构 Swift 的总体架构非常的清晰和独立: # 分层(Tier) 组件(Service) 功能(Function) 特性 部署考量 1 访问层(Access Tier) Load Balancer 硬件(比如F5)或者软件(比如HAPro

RAC: Frequently Asked Questions [ID 220970.1]   修改时间 13-JAN-2011     类型 FAQ     状态 PUBLISHED   Applies to: Oracle Server - Enterprise Edition - Version: 9.2.0.1 to 11.2.0.1 - Release: 9.2 to 11.2 Purpose Frequently Asked Questions for Real Applicatio

61. View the Exhibit.Which statement regarding the dept and emp tables is true?A) When you delete a row from the emp table, you would receive a constraint violation error.B) When you delete a row from the dept table, you would receive a constraint vi

再总结: 一般,清RAID再做RAID,安装完毕后: ./MegaCli64 -PDList -aALL | egrep 'Slot|Enclosure Device'                       查看背板和硬盘位置 ./MegaCli64 -ldinfo -lall -a0 | egrep 'Virtual|RAID'                                      查看RAID状态 ./MegaCli64  -cfglddel -l0 -a0 或者 

HDFS Architecture Introduction The Hadoop Distributed File System (HDFS) is a distributed file system designed to run on commodity hardware. It has many similarities with existing distributed file systems. However, the differences from other distribu

通常,我们使用的DELL/HP/IBM三家的机架式PC级服务器阵列卡是从LSI的卡OEM出来的,DELL和IBM两家的阵列卡原生程度较高,没有做太多封装,可以用原厂提供的阵列卡管理工具进行监控:而HP的阵列卡一般都做过封装了,因此需要使用自身特有的管理工具来监控. 本文以几种常用的阵列卡为例,展示其阵列卡及硬盘监控的方法. DELL SAS 6/iR卡,全称LSI Logic SAS1068E,只支持RAID 0, RAID 1, RAID 1+0, 不支持RAID 5等高级RAID特性,不支持

LVM Logical Volume Manager Volume management creates a layer of abstraction over physical storage, allowing you to create logical storage volumes. Logical volumes provide the following advantages over using physical storage directly: Flexible capacit

LVM Logical Volume Manager Volume management creates a layer of abstraction over physical storage, allowing you to create logical storage volumes. Logical volumes provide the following advantages over using physical storage directly: Flexible capacit

HDFS Architecture HDFS Architecture(HDFS 架构) Introduction(简介) Assumptions and Goals(假设和目标) Hardware Failure(硬件失效是常态) Streaming Data Access(支持流式访问) Large Data Sets(大数据集) Simple Coherency Model(简单一致性模型) “Moving Computation is Cheaper than Moving Data”(

1.首先查看机器是否使用的是MegaRAID卡 dmesg | grep RAID [ 6.932741] scsi host0: Avago SAS based MegaRAID driver 2.添加 megaraid 源: 修改 /etc/apt/sources.list 在末尾添加 deb http://hwraid.le-vert.net/ubuntu precise main 然后执行: apt-get update apt-get install megacli megactl m

In this post, I will give a list of all undocumented parameters in Oracle 12.1.0.1c. Here is a query to see all the parameters (documented and undocumented) which contain the string you enter when prompted: – Enter name of the parameter when prompted

转自: https://blog.minio.io/modern-data-lake-with-minio-part-2-f24fb5f82424 In the first part of this series, we saw why object storage systems like Minio are the perfect approach to build modern data lakes that are agile, cost-effective, and massively

1.Linux系统备份工具 REAR (RELAX-AND-RECOVER) https://blog.csdn.net/qq43748322/article/details/78710754?locationNum=2&fps=1 https://www.suse.com/zh-cn/documentation/sle_ha/book_sleha/data/sec_ha_rear_concept.html 以下是关于backup和rescue备份到同一个ISO的测试过程,供您参考: ~~~ 1

1.下载安装包 下载地址:https://raw.githubusercontent.com/crazy-zhangcong/tools/master/MegaCli8.07.10.tar.gz 2.安装软件包 [root@web-01_zw_119 install]# tar -zxf MegaCli8.07.10.tar.gz [root@web-01_zw_119 install]# tree MegaCli8.07.10 MegaCli8.07.10 ├── Linux │ ├── Li

基础命令学习目录首页 MegaCli64 -LDInfo -Lall -aALL这个命令能看到RAID的状态MegaCli64 -LDSetProp ForcedWB -L0 -a0MegaCli64 -LDSetProp ForcedWB -L1 -a0这两个命令把两个cache打开 原文链接:https://segmentfault.com/a/1190000008780600 手动创建 raid   ##删除raid root@scaler:~# /opt/MegaRAID/MegaCli

安装OMSA wget -q -O - http://linux.dell.com/repo/hardware/latest/bootstrap.cgi | bash yum install -y net-snmp net-snmp-devel net-snmp-utils wget perl OpenIPMI yum -y install srvadmin-all #安装路径:/opt/dell/srvadmin/ /opt/dell/srvadmin/sbin/srvadmin-servic