Data to be moved to the new storage array: ASM_POWER_LIMIT question

DB version: 10.2.0.4
Solaris operating system: 5.10
Setup: 2 NŒUD RAC storage 2 TB of data in 4 LUNS (all 4 LUNs belong to a single storage group)

We will replace our IBM 2 existing a new 4 TB storage array to Sun Storagetek.

That's what I decided to do after a few R & D.

Below are the steps that I've prepared based ML Note: 557348.1

Create 4 LUNs on the new storage, and then create a test using Diskgroup

SQL> CREATE DISKGROUP TEST EXTERNAL REDUNDANCY DISK '/rdsk/c0t1s1', '/rdsk/c0t1s2', '/rdsk/c0t1s3', '/rdsk/c0t1s4';

Check if the diskgroup is created and mounted:

SQL> SELECT STATE, NAME FROM V$ASM_DISKGROUP;

If so, then manually mount on other instances of ASM:

SQL> ALTER DISKGROUP TEST MOUNT;
SQL> SELECT STATE, NAME FROM V$ASM_DISKGROUP;

If the previous steps were successful and the diskgroup TEST can be mounted with success (on each ASM instance), and then drop the diskgroup TEST as follows:

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).

Records of candidate is ready to be added to the desired diskgroup:

SQL> ALTER DISKGROUP <my production diskgroup> ADD DISK '/rdsk/c0ts1', '/rdsk/c0t1s2', '/rdsk/c0t1s3', '/rdsk/c0t1s4';

My question:
Since involved LUNS are of large size, and rebalancing would make the command Add DRIVE slower. Right?
I am thinking of setting the ASM_POWER_LIMIT to 0 until I started to do this and later new rever to 1. Is this a good approach?

Hello

My question:
Since involved LUNS are of large size, and rebalancing would make the command Add DRIVE slower. Right?

No, when you run the command ' add/drop disc' ASM reads and writes only metadata in the headers of all asmdisks (belonging to the diskgroup) and the guest is released.
The complete rebalancing of the data process runs in the background.

The fact that the guest to be released does not mean that the operation has ended. You need to check on the V$ ASM_DISKS (GROUP_NUMBER, PATH, HEADER_STATUS, NAME) to determine if you can remove the disks to the HOST.

see this example (no difference at the time of change of power of rebalancing)

===================================================

SQL> ALTER DISKGROUP DG_DATA
        ADD DISK '/dev/oracleasm/disks/ASM_VOL'
        DROP DISK DG_DATA_0000
REBALANCE POWER 0; 

Diskgroup altered.

Elapsed: 00:00:07.90

====================================================
SQL> ALTER DISKGROUP DG_DATA
        ADD DISK '/dev/oracleasm/disks/DISK01'
        DROP DISK DG_DATA_0001
REBALANCE POWER 5; 

Diskgroup altered.

Elapsed: 00:00:08.21

I am thinking of setting the ASM_POWER_LIMIT to 0 until I started to do this and later new rever to 1. Is this a good approach?

You must know that the rebalancing will take place when there is a change of configuration diskgroup.
Be careful, affecting the ASM_POWER_LIMIT 0 can let the diskgroup in a State of imbalance or unbalanced. (I do not recommend this)

My recommendation:

(* 1) save all your databases and valid backup (always required to protect your data). *

You NEED to check the note below before add your ASMDISK.
* Block Corruption in ASM while that balance [ID 1098453.1] *.

2) run in two steps

alter diskgroup  add disks  rebalance power x;
alter diskgroup  drop disks  rebalance power x;

Or Execute in a single step. (My favorite)
Alternatively, we can run add disk & drop drive statements in a single operation, in what way that a rebalancing operation will be launched.

alter diskgroup 
 add disk 
 drop disk 
rebalance power 9;

Wait until the end of the operation of rebalancing.
You can follow the process of rebalancing using the following queries:

SELECT  NAME,
     PATH,
     HEADER_STATUS,
     ROUND(TOTAL_MB/1024)  TOTAL_GB,
      ROUND( FREE_MB/1024) FREE_GB,
     ROUND((TOTAL_MB-FREE_MB)/1024) TOTAL_USED_GB
FROM V$ASM_DISK
WHERE GROUP_NUMBER= (SELECT GROUP_NUMBER FROM
     V$ASM_DISKGROUP WHERE NAME='DG_DATA');

select * from v$asm_operation; 

select * from gv$asm_operation;

select      NAME,
     ROUND(TOTAL_MB/1024)  TOTAL_GB,
     ROUND( FREE_MB/1024) FREE_GB,
     ROUND((TOTAL_MB-FREE_MB)/1024) TOTAL_USED_GB,
     UNBALANCED
FROM V$ASM_DISKGROUP;

Kind regards
Levi Pereira

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