Re: Mirroring redo log groups or not ?

  • From: Rajeev Prabhakar <rprabha01@xxxxxxxxx>
  • To: Jon.Crisler@xxxxxxx
  • Date: Tue, 7 Apr 2009 12:48:11 -0400

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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