RE: Multiplex Redo Logs with Mirrored Disks?

  • From: "Hostetter, Jay M" <JHostetter@xxxxxxxxxxxxxxxxxxxx>
  • To: "ORACLE-L (E-mail)" <oracle-l@xxxxxxxxxxxxx>
  • Date: Tue, 23 Nov 2004 11:49:07 -0500

This protects you against a single disk failure but doesn't protect you
against other things, such as fat fingering a redo log or (in my case)
encountering a firmware bug in a controller that hoses a file system.


-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx] On Behalf Of David Wagoner
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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