A couple of times I've removed ASM disks from a diskgroup and found that the rebalance operation will take too long.
This is not a problem when you don't want to disturb online users, the rebalance process only locks for writes 1mb of data at a time, so letting the rebalance to run slowly has no performance impact.
My problem was that I needed to free the disks as fast as possible in order to finish some IO tests within a limited timeframe.
The procedure to change the rebalance power of an ongoing operation is very simple:
alter diskgroup DATADG rebalance power 6;
After that the rebalance operation will restart with the new set rebalance power.
For a complete example check this document:
Changing the rebalance power of an ongoing rebalance operation
Comments (1)
Thanks for the tip. Didn't know you could remove the asm disk without disturbing other users. Takes ages otherwise.
Posted by Oracle Certification | July 11, 2008 12:09 AM
Posted on July 11, 2008 00:09