RE: Multiplex Redo Logs with Mirrored Disks?

>> Also, I have experienced bugs with mirroring hardware/software that
>> caused the mirror to corrupt data

Yep. Single best argument for multiplexing, period. Redundancy is a wonderful thing.

RF  

-----Original Message-----
From: oracle-l-bounce_at_freelists.org
To: dwagoner_at_arsenaldigital.com; oracle-l_at_freelists.org Sent: 11/23/2004 11:16 AM
Subject: RE: Multiplex Redo Logs with Mirrored Disks?

I disagree -=20

-multiplexing provides you protection against user error that mirroring doesn't.=20
-Also, I have experienced bugs with mirroring hardware/software that caused the mirror to corrupt data

-----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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