Re: Redo: OS Mirror vs. Oracle mirror

I've been told that you should still mirror your redo logs, that is have more than one member per redo log group even if you are using hardware mirrorring. The reason given was that there is only one I/O done to the drive and if that one I/O is bad you'll lose your current redo. One of our Oracle DB's has 80 (20 MB) redo log groups but only one member per group. And these 80 groups are on a mirrored RAID drive.

I'd be glad to hear others views on this as well.

Thanks,

Rob.

Tim Vannaman wrote in message <34F8AE85.C974D44_at_flash.net>...
>I was reading the 7.3.4 installation guide for AIX and noticed (almost
>hidden at the bottom of a paragraph) that Oracle can do a "parallel"
>write to the redo's, but when the size is greater than 128k,
>performance will degrade (when Oracle mirroring).
>
>I'd like to hear other your thoughts on Oracle mirroring vs. OS
>mirroring and why.
>
>Tim.
>
>
>
>
Received on Sun Mar 01 1998 - 00:00:00 CST