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Home -> Community -> Mailing Lists -> Oracle-L -> RE: Multiplex Redo Logs with Mirrored Disks?
=20
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.
Jay
-----Original Message-----
From: oracle-l-bounce_at_freelists.org
[mailto:oracle-l-bounce_at_freelists.org] 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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