Re: Multiplex Redo Logs with Mirrored Disks?

From: Terry Sutton <terrysutton_at_usa.net>
Date: Tue, 23 Nov 2004 13:08:09 -0800
Message-ID: <002d01c4d1a0$bd799190$6bf5a8c0@TerrySutton>

It depends on what you call "need". Remember that there can be issues other than losing a drive. Have you ever accidentally done a "rm *" in the wrong directory?

--Terry

Original Message ----- From: "David Wagoner" <dwagoner_at_arsenaldigital.com> To: "ORACLE-L (E-mail)" <oracle-l_at_freelists.org> Sent: Tuesday, November 23, 2004 7:46 AM 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 - 19:07:50 CST