RE: Multiplex Redo Logs with Mirrored Disks?

  • From: "Nick Tilbury @ Northampton" <ntilbury@xxxxxxxxxxxx>
  • To: "'dwagoner@xxxxxxxxxxxxxxxxxx'" <dwagoner@xxxxxxxxxxxxxxxxxx>, "ORACLE-L (E-mail)" <oracle-l@xxxxxxxxxxxxx>
  • Date: Tue, 23 Nov 2004 16:48:32 -0000

IMHO - What you are questionning is 'best-practice' and relying on hardware
solutions to get
you out of any potential failures. I'd say your on a slippery slope.
Stick with best practice and have at least 2 members per group.


Nick
-----Original Message-----
From: oracle-l-bounce@xxxxxxxxxxxxx
[mailto:oracle-l-bounce@xxxxxxxxxxxxx]On Behalf Of David Wagoner
Sent: 23 November 2004 15:47
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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