RAC – Louis workspace

ASM memory fragment problem in 11gR2 RAC

Posted on June 7, 2013December 22, 2014 by admin

前天处理了一启RAC ASM 内存泄露问题，系统为公司最后一套RAC one node 版本为11.2.0.3

这套核心RAC one node系统出现大量 log file switch buffer busy waits等待,并伴随大量cursor: pin S wait on X re[……]

[转] ASM Handling Block Corruptions

Posted on November 25, 2012December 22, 2014 by admin

Some excellent experiment From Honcho

为了保护disks 上的数据，Oracle ASM 对disk groups 有3种冗余方式:
（1）external redundancy 表示Oracle不帮你管理镜像，功能由外部存储系统实现，比如通过RAID技[……]

Solaris 10g CRS 自动reboot一例

Posted on October 18, 2012December 22, 2014 by admin

最近RAC 的case实在太多,越来越觉得公司逐渐去rac的正确。一套sunOS的系统在安装完crs 10g之后服务器不停的自动reboot,具体环境如下：

root@bmsa#showrev 
Hostname: bmsa
Hostid: 84f94303
Release: 5.1[......]Read more

11gR2 rac install ASM terminating the instance due to error 481

Posted on October 16, 2012December 22, 2014 by admin

一套新上线的RAC系统(redhat 5.8 RAC 11.2.0.3) 安装过程中跑GI root.sh时抛出error 481错误：

CRS-2672: Attempting to start 'ora.asm' on 'ptdb1'
CRS-50[......]Read more

CRS troubleshooting 两例

Posted on September 11, 2012December 22, 2014 by admin

一套10.2.0.5 RAC 系统 evmd cssd服务无法启动

CRS version

[oracle@ptdb02 oracle]$ crsctl query crs softwareversion
CRS software version on node [ptdb02] is[……]

11g Smart Flash Cache

Posted on August 30, 2012December 22, 2014 by admin

整理一篇关于11g smart flash cache 的文章,louisliu

11g r2 flashcache_Tips from Louis liu

我们来做一下演示采用FusionIO SLC 160G

[oracle@db-41 ~]$ ls -l /de[......]Read more

Why ASM?

Posted on June 13, 2012December 22, 2014 by admin

Why ASM?

. ASM is an Oracle provided Database/Cluster filesystem and Storage Volume manager, optimized for Oracle for any kind of workload (b[……]

11gR2 rac ora.asm error (ASM)

Posted on April 26, 2012December 22, 2014 by admin

ASM – ora.asm error

11.2.0.3 RAC CRS 无法启动

[ohasd(25286)]CRS-2112:The OLR service started on node db-41.
2012-04-25 14:46:13.120
[ohas[……]

ASM Preferred mirror Read

Posted on April 25, 2012December 22, 2014 by admin

ASM Preferred mirror Read

Introduction

The concept of the Preferred Read is not a new idea, but is now implemented in Oracle’s ASM volume[……]

11gR2 RAC Rebootless Node Fencing

Posted on March 6, 2012December 22, 2014 by admin

Rebootless Node Fencing

In versions before 11.2.0.2 Oracle Clusterware tried to prevent a split-brain with a fast reboot (better: reset) of the[……]