Raw Disk Migration Steps (OCR,VOTING,ASM) – Oracle RAC 10g

                                                          

1)      Disk Migration of the OCR Disks

#########################

a).       Backup all OCR-related files. 
b).      Current Status of OCR disks.

 {CRS_HOME}/bin/ocrcheck 

c).      Backup the /var/opt/oracle/ocr.loc file:

 cp ocr.loc ocr.loc.old

  
d).       Manually backup OCR:

$ocrconfig -export  /exports/OCRFile_exp.dmp

 Important : -  As root, run the following commands to replace OCR files. This change can be performed on-line, and will be reflected across the entire cluster.

e). Replace new rawdisk 

{CRS_HOME}/bin/ocrconfig -replace  ocr  /dev/raw/raw9
 

{CRS_HOME}/bin/ocrconfig -replace  ocrmirror  /dev/raw/raw10

   

 

f). Check new ocr.loc file updated:

cat /var/opt/oracle/ocr.loc

ocrconfig_loc=/dev/raw/raw9

ocrmirrorconfig_loc=/dev/raw/raw10

g). Check Status of Newly added OCR:

{CRS_HOME}/bin/ocrcheck

2)       Disk Migration of the Voting Disks

###########################

Important : - Shutdown the Oracle Clusterware (crsctl stop crs as root) on all nodes before making any modification to the voting disk

a). Status check of current  Voting disks.

b). Backup voting disks using dd:

dd if={voting_disk_name} of={backup_file_name}

Example,

dd if=/dev/raw/raw3 of=/tmp/voting1

c).  Stop CRS.

d).  Add/remove voting disks.

/opt/oracrs/bin/crsctl delete css votedisk /dev/raw/raw3  -force

/opt/oracrs/bin/crsctl add  css votedisk /dev/raw/raw11 –force

/opt/oracrs/bin/crsctl delete css votedisk  /dev/raw/raw4 –force

/opt/oracrs/bin/crsctl add css votedisk  /dev/raw/raw12 –force

/opt/oracrs/bin/crsctl delete css votedisk  /dev/raw/raw5 –force

/opt/oracrs/bin/crsctl add css votedisk  /dev/raw/raw13 –force

e). Status check of current  Voting disks.

 

 /opt/oracrs/bin/crsctl query css votedisk

f). Start Cluster

crsctl start crs

3) Disk Migration of ASM

#####################

a). Take full database backup.

b) Check Current status of asm disks

select name,header_status,path from v$asm_disk;

c). Both old and new SAN LUNs must be presented to all the RAC nodes.

d). Once the LUNs are visible we need to stamp them to use them as ASM disks.

e). Login to ASM instance and verify the newly added ASM disks.

select name,header_status,path from v$asm_disk;

f).  Add new asm disk to ASM groups

alter diskgroup TESDB_DG1 add disk  '/dev/raw/raw15' rebalance power 5;

alter diskgroup TESDB_DG1 add disk  '/dev/raw/raw16' rebalance power 5;

alter diskgroup TESDB_ARCDG1 add disk '/dev/raw/raw14' rebalance power 5;

Monitor Rebalancing operation

 select * from v$asm_operation;

 g). Check status after added  asm disks in asm groups.

Select path,name from v$asm_disk where group_number=2;

Select path,name from v$asm_disk where group_number=1;

h). Drop old asm disks from ASM groups

alter diskgroup TESDB_DG1 drop disk 'TESDB_DG1_0000';

alter diskgroup TESDB_DG1 drop disk 'TESDB_DG1_0001';

alter diskgroup TESDB_ARCDG1  drop disk ' TESDB_ARCDG1_0000'; 

i). Check status after dropped asm disks from asm groups.

Select path,name from v$asm_disk where group_number=2;

Select path,name from v$asm_disk where group_number=1;

j). Check current asm disks status.

select name,header_status,path from v$asm_disk;

Thanks & Regards
Gaurav Sharma