RAC

ASM memory fragment problem in 11gR2 RAC

June 7, 2013 oracle, RAC No comments

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[……]

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[转] ASM Handling Block Corruptions

November 25, 2012 oracle, RAC No comments

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[……]

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Solaris 10g CRS 自动reboot一例

October 18, 2012 oracle, RAC No comments

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

October 16, 2012 11g, oracle, RAC No comments

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[......]
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CRS troubleshooting 两例

September 11, 2012 oracle, RAC No comments

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[……]

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11g Smart Flash Cache

August 30, 2012 11g, oracle, RAC No comments

整理一篇关于11g smart flash cache 的文章,vmcd

我们来做一下演示 采用FusionIO SLC 160G

[oracle@db-41 ~]$ ls -l /dev/fi[......]
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Why ASM?

June 13, 2012 oracle, RAC No comments

Why ASM?

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

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11gR2 rac ora.asm error (ASM)

April 26, 2012 maintain, oracle, RAC No comments ,

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[……]

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ASM Preferred mirror Read

April 25, 2012 oracle, RAC 2 comments

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[……]

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11gR2 RAC Rebootless Node Fencing

March 6, 2012 Internals, oracle, RAC No comments

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[……]

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