RE: Voting Disks and OCR on 11.2.0.2
- From: John Hallas <John.Hallas@xxxxxxxxxxxxxxxxxx>
- To: "Jed_Walker@xxxxxxxxxxxxxxxxx" <Jed_Walker@xxxxxxxxxxxxxxxxx>, "cichomitiko@xxxxxxxxx" <cichomitiko@xxxxxxxxx>, Zabair Ahmed <roon987@xxxxxxxxxxx>
- Date: Wed, 21 Nov 2012 17:19:54 +0000
I agree entirely Jed - I am happy with external redundancy as I accept the
storage layer provides redundancy, however for such
things as voting disks and redo logs (which are both very small relative to
overall database sizes) then I would certainly advocate mirroring whenever
possible.
John
www.jhdba.wordpress.com
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Walker, Jed S
Sent: 19 September 2012 16:56
To: cichomitiko@xxxxxxxxx; Zabair Ahmed
Cc: oracle-l@xxxxxxxxxxxxx
Subject: RE: Voting Disks and OCR on 11.2.0.2
I wouldn't rely on the storage mirroring for the voting disk. I would have it
redundant within Oracle also - as you would for controlfiles, online redo logs,
etc. I have seen it happen before where a flaw in the mirroring technology
resulted in the loss of a file. The system had been created with single online
redo logs because the disk was mirrored, but the mirroring failed and the
database failed with it.
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx [mailto:oracle-l-bounce@xxxxxxxxxxxxx] On
Behalf Of Radoulov, Dimitre
Sent: Wednesday, September 19, 2012 5:07 AM
To: Zabair Ahmed
Cc: oracle-l@xxxxxxxxxxxxx
Subject: Re: Voting Disks and OCR on 11.2.0.2
On 19/09/2012 12:58, Zabair Ahmed wrote:
> So, back to my original question. Do I have a single point of failure?
> I have single raw/block device LUN which is configured within ASM as
> an ASM diskgroup (ASMSYS) with EXTERNAL REDUNDANCY to hold a single
> Voting Disk. At the SAN level I am told by the sysadmin that it's
> either RAID 1 or RAID 5.
>
So it appears that your single voting disk is on a mirrored LUN (RAID 1 or 5),
I don't consider this a single point of failure.
Regards
Dimitre
--
//www.freelists.org/webpage/oracle-l
--
//www.freelists.org/webpage/oracle-l
______________________________________________________________________
Wm Morrison Supermarkets Plc is registered in England with number 358949. The
registered office of the company is situated at Gain Lane, Bradford, West
Yorkshire BD3 7DL. This email and any attachments are intended for the
addressee(s) only and may be confidential.
If you are not the intended recipient, please inform the sender by replying to
the email that you have received in error and then destroy the email.
If you are not the intended recipient, you must not use, disclose, copy or rely
on the email or its attachments in any way.
This email does not constitute a contract in writing for the purposes of the
Law of Property (Miscellaneous Provisions) Act 1989.
Our Standard Terms and Conditions of Purchase, as may be amended from time to
time, apply to any contract that we enter into. The current version of our
Standard Terms and Conditions of Purchase is available at:
http://www.morrisons.co.uk/gscop
Although we have taken steps to ensure the email and its attachments are
virus-free, we cannot guarantee this or accept any responsibility,
and it is the responsibility of recipients to carry out their own virus checks.
______________________________________________________________________
--
//www.freelists.org/webpage/oracle-l
Other related posts:
