ASM中OCR重建 - 墨天轮文档

ASM中OCR重建

小蛋蛋

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2020-07-09

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一般 ASM 中 OCR 盘应做 normal 冗余，有 3 个失败组，本次实验为测试环境就只做了 external 只有一块盘，

思路是一样的，利用 dd 命令破坏 asm 盘头部，再重建。

1.确定 ocr 盘为/dev/raw/raw1

```

SQL> col path for a30

SQL> set lines 100

SQL> select name,mount_status,header_status,mode_status,state,path from

v$asm_disk;

NAME MOUNT_S HEADER_STATU MODE_ST STATE PATH

------------------------------ ------- ------------ ------- --------

------------------------------

FRA_0000 CACHED MEMBER ONLINE NORMAL /dev/raw/raw2

OCR_0000 CACHED MEMBER ONLINE NORMAL /dev/raw/raw1

DATA_0000 CACHED MEMBER ONLINE NORMAL /dev/raw/raw3

```

2.确定 ocr 盘有自动备份

```

[root@ltrac1 ~]# ocrconfig -showbackup

ltrac2 2020/07/09 13:05:25 /u01/app/grid_home/cdata/ltrac-

cluster/backup00.ocr

ltrac2 2020/07/09 09:05:24 /u01/app/grid_home/cdata/ltrac-

cluster/backup01.ocr

ltrac2 2020/07/09 05:05:24 /u01/app/grid_home/cdata/ltrac-

cluster/backup02.ocr

ltrac2 2020/07/08 01:05:20 /u01/app/grid_home/cdata/ltrac-

cluster/day.ocr

ltrac1 2020/07/02 10:17:36 /u01/app/grid_home/cdata/ltrac-

cluster/week.ocr

ltrac2 2020/07/03 16:53:15 /u01/app/grid_home/cdata/ltrac-

cluster/backup_20200703_165315.ocr

```

3.破坏 OCR 盘头部

```

[root@ltrac1 ~]# dd if=/dev/zero of=/dev/raw/raw1 bs=1024 count=100000

100000+0 records in

100000+0 records out

102400000 bytes (102 MB) copied, 13.9248 s, 7.4 MB/s

```

再查看 OCR 盘头部状态为 CANDIDATE 候选状态，说明 OCR 头部磁盘可能损坏了。

```

NAME MOUNT_S HEADER_STATU MODE_ST STATE PATH

------------------------------ ------- ------------ ------- --------

------------------------------

FRA_0000 CACHED MEMBER ONLINE NORMAL /dev/raw/raw2

OCR_0000 CACHED CANDIDATE ONLINE NORMAL /dev/raw/raw1

DATA_0000 CACHED MEMBER ONLINE NORMAL /dev/raw/raw3

```

4.重启两台集群服务器

```

reboot

```

查看集群 alert 日志

```

[cssd(3015)]CRS-1714:Unable to discover any voting files, retrying discovery in

15 seconds; Details at (:CSSNM

00070:) in /u01/app/grid_home/log/ltrac1/cssd/ocssd.log

```

5.编辑 rac 安装中用于配置 crs 配置的文件

```

[root@ltrac1 ltrac1]# find / -name crsconfig_params

/u01/app/grid_home/crs/install/crsconfig_params

/u01/app/grid_home/inventory/Templates/crs/install/crsconfig_params

```

这个文件是安装 grid 时，root 脚本调用的配置脚本，主要用于初始化 asm 磁盘组 ocr、voting。

现在要修改下，使用一块新盘放 ocr，此处因为 OCR 盘没有坏就不做修改了。

确认好冗余方式跟新的 asm 盘，在两个节点修改下下面两个参数：

```

[root@ltrac1 ltrac1]# vim /u01/app/grid_home/crs/install/crsconfig_params

......

ASM_REDUNDANCY=EXTERNAL

ASM_DISKS=/dev/raw/raw1

```

6.两个节点清除老的 rac 配置（root 用户，先执行节点 1，再执行节点 2，会很久）

```

节点 1：

[root@ltrac1 ltrac1]# /u01/app/grid_home/crs/install/rootcrs.pl -deconfig -force

Using configuration parameter file:

/u01/app/grid_home/crs/install/crsconfig_params

PRCR-1119 : Failed to look up CRS resources of ora.cluster_vip_net1.type type

PRCR-1068 : Failed to query resources

Cannot communicate with crsd

PRCR-1070 : Failed to check if resource ora.gsd is registered

Cannot communicate with crsd

PRCR-1070 : Failed to check if resource ora.ons is registered

Cannot communicate with crsd

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