Re: ASM rebalancing

From: Chris Taylor <>
Date: Wed, 20 May 2015 11:14:46 -0500
Message-ID: <>

For some reason, many of us (myself included) used to think ASM moved hot blocks to different areas to smooth out performance. This was a myth but I'm unsure of the origin.
I know it started many years ago however and I was disabused of the notion some time ago.

The only rebalancing ASM does is when you add or remove disks and data has to be moved/rebalanced based on percentages used of each device in the disk group. Has nothing to do with block usage.


On Wed, May 20, 2015 at 11:00 AM, Malcolm Lawrence <> wrote:

> All,
> Does ASM move hot spots around in the background, or do you have to do a
> rebalance accomplish that?
> I cannot find anywhere in Oracle documentation stating that it does, so I
> assume that that it does not.
> Malcolm Lawrence

Received on Wed May 20 2015 - 18:14:46 CEST

Original text of this message