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:[EMAIL PROTECTED]] > 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 ? > > -- 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).
