Re: ASM rebalancing
From: Chris Taylor <christopherdtaylor1994_at_gmail.com>
Date: Wed, 20 May 2015 11:14:46 -0500
Message-ID: <CAP79kiR=8A4hSrjg8H4DwiwdVOYCZZib0ViUeHF7UHd+JedVSQ_at_mail.gmail.com>
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.
Date: Wed, 20 May 2015 11:14:46 -0500
Message-ID: <CAP79kiR=8A4hSrjg8H4DwiwdVOYCZZib0ViUeHF7UHd+JedVSQ_at_mail.gmail.com>
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.
Regards,
Chris
On Wed, May 20, 2015 at 11:00 AM, Malcolm Lawrence < lawrence.malcolm_at_gmail.com> 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
>
-- http://www.freelists.org/webpage/oracle-lReceived on Wed May 20 2015 - 18:14:46 CEST