RE: asm disks
Date: Mon, 4 Feb 2013 14:52:04 -0600
Message-ID: <F05D8DF1FB25F44085DB74CB916678E885711A56E4_at_NADCWPMSGCMS10.hca.corpad.net>
To follow on Andrew, I would imagine that hardware raid (EXTERNAL redundancy) would be more efficient (less penalty) than ASM redundancy - but I may be mistaken since I'm an ASM newbie myself.
Chris
-----Original Message-----
From: oracle-l-bounce_at_freelists.org [mailto:oracle-l-bounce_at_freelists.org] On Behalf Of Andrew Kerber
Sent: Monday, February 04, 2013 2:45 PM
To: funrx1_at_gmail.com
Cc: oracle-l_at_freelists.org
Subject: Re: asm disks
ASM has the options of normal redundancy, high redundancy, and external redundancy. Every time I have worked with ASM for database storage I have used external redundancy, which means using the hardware RAID functionality instead of the ASM functionality. I do sometimes use a high redundancy group for the OCR and voting files, in addition to the hardware RAID, since those groups are relatively small.
I guess this is a long winded way of saying most people only use the ASM mirroring if the hardware RAID is unavailable, and I expect that is a best practice, though I do not recall seeing it anywhere.
On Mon, Feb 4, 2013 at 2:37 PM, Mike Hayes <funrx1_at_gmail.com> wrote:
> I haven't done anything with ASM disks. Had a consultant come in to do
> an install on a physical server with it's own set of disks. He was all
> about that ASM was the way to go and to not use hardware raid and just
> let ASM do everything for you was best practice. Now I start reading
> the Storage Administrators guide and come across the following in chapter 2:
> Logical unit numbers (LUNs)шк~sing hardware RAID functionality to
> create LUNs is a recommended approach. Storage hardware RAID 0+1 or
> RAID5, and other RAID configurations, can be provided to ASM as ASM disks.
>
> It seems to me we have just gone against best practice. For those who
> have experience with ASM do you use hardware raid or not?
>
> Thanks in advance for your input.
>
> --
> http://www.freelists.org/webpage/oracle-l
>
>
>
-- Andrew W. Kerber 'If at first you dont succeed, dont take up skydiving.' -- http://www.freelists.org/webpage/oracle-l -- http://www.freelists.org/webpage/oracle-lReceived on Mon Feb 04 2013 - 21:52:04 CET