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 <[EMAIL PROTECTED]> 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: [EMAIL PROTECTED] > > Fat City Network Services -- (858) 538-5051 FAX: > (858) 538-5051 > San Diego, California -- Public Internet > access / Mailing Lists > -------------------------------------------------------------------- > To REMOVE yourself from this mailing list, send an > E-Mail message > to: [EMAIL PROTECTED] (note EXACT spelling of > 'ListGuru') and in > the message BODY, include a line containing: UNSUB > ORACLE-L > (or the name of mailing list you want to be removed > from). You may > also send the HELP command for other information > (like subscribing). ===== Connor McDonald http://www.oracledba.co.uk (mirrored at http://www.oradba.freeserve.co.uk) "Some days you're the pigeon, some days you're the statue" __________________________________________________ Do You Yahoo!? Everything you'll ever need on one web page from News and Sport to Email and Music Charts http://uk.my.yahoo.com -- Please see the official ORACLE-L FAQ: http://www.orafaq.com -- Author: =?iso-8859-1?q?Connor=20McDonald?= INET: [EMAIL PROTECTED] Fat City Network Services -- (858) 538-5051 FAX: (858) 538-5051 San Diego, California -- Public Internet access / Mailing Lists -------------------------------------------------------------------- To REMOVE yourself from this mailing list, send an E-Mail message to: [EMAIL PROTECTED] (note EXACT spelling of 'ListGuru') and in the message BODY, include a line containing: UNSUB ORACLE-L (or the name of mailing list you want to be removed from). You may also send the HELP command for other information (like subscribing).
