An unmirrored disk will run faster (with respect to
writes) than a mirrored one (not twice as fast since
writes on a mirror are typically done in parallel).
Then again - now you've got an unmirrored redo
log...not a good idea. To get around this, you'd need
to duplex it through Oracle - which pretty much gets
you back to a "mirrored" redo log.
hth
connor
- VIVEK_SHARMA <VIVEK_SHARMA_at_infy.com> wrote: >
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 ?
> --
> Please see the official ORACLE-L FAQ:
> http://www.orafaq.com
> --
> Author: VIVEK_SHARMA
> INET: VIVEK_SHARMA_at_infy.com
>
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Received on Thu Nov 15 2001 - 05:30:24 CST
