Oracle rac 添加磁盘到磁盘组（官方文档）

GOAL

Before you add the disk(s) to your production diskgroup, you can use the next steps to validate whether the candidate disk(s) is/are in good shape and can be accessed from each node (without harm the existing production diskgroups), as follow:

 

SOLUTION

1) As Oracle or Grid OS user, run the next commands on each node (if ASMLIB API is used):

# /etc/init.d/oracleasm  scandisks  #(only this command needs to be executed as root user)

$> id

$> /etc/init.d/oracleasm  listdisks

$> /etc/init.d/oracleasm  querydisk <each disk from previous output>

Note: All the disks must be visible from each node.

 

2) Confirm the disks are visible (I/O) at OS level (as oracle or grid OS user) from each node:

$> id

$> ls -l  <disk name>

$> dd if=<raw/character or block partition device in  question> of=/dev/null count=100 bs=8192

 

Example:

$> dd if=/dev/raw/raw1 of=/dev/null count=100 bs=8192  # raw device

$> dd if=/dev/oracleasm/disks/PRODA07 of=/dev/null count=100 bs=8192  # ASMLIB device

$> dd if=/dev/rdsk/c1t3d0s6 of=/dev/null count=100 bs=8192 # raw device

 

3) Verify that kfed can read on the candidate disk(s) at OS level (as oracle or grid OS user) from each node:

$> kfed read  <raw/character or block partition device in question>

 

Example:

$> kfed read /dev/raw/raw1

$> kfed read /dev/oracleasm/disks/PRODA07

$> kfed read /dev/rdsk/c1t3d0s6

Note: If the disk is not a FORMER disk, then kfed on new disks will return:    kfbh.type: 0 ; 0x002: KFBTYP_INVALID and that is expected.

 

4) Create a new temporary diskgroup:

SQL> CREATE DISKGROUP TEST EXTERNAL REDUNDANCY DISK '<YOUR CANDIDATE DISK>';

 

5) Check if the diskgroup is created and mounted:

SQL> SELECT STATE, NAME FROM V$ASM_DISKGROUP;

 

6) If so, then manually mount it on the other ASM instance(s):

SQL> ALTER DISKGROUP TEST MOUNT;

SQL> SELECT STATE, NAME FROM V$ASM_DISKGROUP;

 

7) If the previous steps had success and the TEST diskgroup can be successfully mounted (on each ASM instance), then drop the TEST diskgroup as follow:

SQL> alter diskgroup test dismount; --(from all the ASM instances, except from one).

SQL> DROP DISKGROUP TEST; --(from the ASM instance, which the diskgroup is still mounted).

 

8) Then the candidate disk is ready to be added to the desired diskgroup:

SQL> ALTER DISKGROUP <my production diskgroup> ADD DISK '<your candidate disk>';