RE: Multiplex Redo Logs with Mirrored Disks?

On a mirrored disk system, I don't multiples the redo logs. First off the disk subsystem is much more efficient at the job than Oracle. Second it becomes redundant storage.=20

Dick Goulet
Senior Oracle DBA
Oracle Certified 8i DBA
-----Original Message-----

From: David Wagoner [mailto:dwagoner_at_arsenaldigital.com]=20 Sent: Tuesday, November 23, 2004 10:47 AM To: ORACLE-L (E-mail)
Subject: Multiplex Redo Logs with Mirrored Disks?

Is there any need to multiplex redo logs with mirrored disks (e.g., RAID-1
or RAID-1+0)?
Example- Oracle recommends multiplexing redo logs on separate disks, like
redo01a.log on Disk1 and redo01b.log on Disk2, etc.

However, now that mirrored disks are in common use with RAID-1+0, RAID-1,
etc. it seems that sufficient protection is in place to use only a single
copy of each redo log. This would also provide the benefit of reduced disk
I/O to write redo information to disk.

Anyone disagree?

Best regards,

David B. Wagoner
Database Administrator

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http://www.freelists.org/webpage/oracle-l Received on Tue Nov 23 2004 - 13:36:16 CST