RE: Configuring for Online Redo Logfiles

Ed/List

Would NOT reads be Faster with RAID 1 than NO-Raid for the online redo logfile ?

Thanks

> -----Original Message-----
> From: Edward Shevtsov [SMTP:ed_at_mb.ru]
> Sent: Thursday, November 15, 2001 12:50 PM
> To: Multiple recipients of list ORACLE-L
> Subject: Re: Configuring for Online Redo Logfiles
>
> Hi Vivek,
>
> From performance point of view a single disk will be a little faster
> as
> there is a small overhead associated with the process of mirroring to
> the
> second member of the RAID1.
>
> Regards,
> Ed
>
>
> > EXCERPT from "Implementing Raid On Oracle Systems" by Gaja Krishna
> > Vaidyanatha, Quest Software Inc. :-
> > "RAID 1 - Ideal for online and archived redo logs, Leaves the
> write-head
> > at the location of the last write. On most systems, you will need 3
> > volumes for the online redo logs (for 3 groups) and 1 volume for the
> > archived redo logs. If your database is in NOARCHIVELOG mode, you
> > probably can get away with a single RAID 1 volume for your
> redo-logs.
> > However, for databases in ARCHIVELOG mode you will need to further
> > separate you"
> > Qs. Puttting an Online Redo log on a RAID1 Volume ( Volume
> Containing 1
> > Disk Mirrored to Another Disk ) versus putting the Same Online redo
> file
> > on a Single Disk (NON-Mirrored) , which would give Better
> performance ,
> > Why ?
> >

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Author: VIVEK_SHARMA
  INET: VIVEK_SHARMA_at_infy.com

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