RE: Mirroring redo log groups or not ?
- From: "Crisler, Jon" <Jon.Crisler@xxxxxxx>
- To: "Rajeev Prabhakar" <rprabha01@xxxxxxxxx>
- Date: Tue, 7 Apr 2009 13:14:12 -0400
The redo logs are 6 groups, 2 members each, 1gb in size. The SAN is EMC
Clariion. Raid 5 does have somewhat poorer performance in writes in our
environment but its usually not a major factor.
-----Original Message-----
From: Rajeev Prabhakar [mailto:rprabha01@xxxxxxxxx]
Sent: Tuesday, April 07, 2009 12:48 PM
To: Crisler, Jon
Cc: Oracle-L Freelists
Subject: Re: Mirroring redo log groups or not ?
Hello Jon,
Before you go into redesign of the redo logs, did you check w/the
SAs/Storage
Admins ? During my last interactions with type of performance issue, I
found
that RAID 5 had a negative effect on overall performance during QA
testing. of
course, your mileage may vary.
Can you share your findings (as seen by SA/Storage Admins). How big are
your
redo logs ? What kind of disks (Storage/SAN) are you folks using ?
-Rajeev
On Tue, Apr 7, 2009 at 12:16 PM, Crisler, Jon <Jon.Crisler@xxxxxxx>
wrote:
> So, if the LUN that holds the online redo logs is already protected
(raid 1,
> 5 etc) do I really need to mirror the online redo logs ? Should I
convert
> the LUN to Raid 1 / 0 ? if I convert to Raid 1/ 0 should I keep redo
log
> mirroring and point to the same LUN ?
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