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We are trying to add some more redundancy to a very busy OLTP database and I have this question.
I currently have 4 dedicated logging disks as follows:
disk 1 = control01.ctl, redo1a.log disk 2 = control02.ctl, redo2a.log disk 3 = control03.ctl, redo1b.log disk 4 = redo2b.log disk 5 = archive_dest_1
These 5 'disks' are all RAID 0+1 volume groups on an IBM SAN. (18Gb 10k rpm) I want to add another logging disk which will be on another SAN Switch/RAID Controller, in order to protect against failures in our Brocade Switch or IBM FastT controller. (We have two independent SAN's)
disk 6 = redo3.log, archive_dest_2
Disk 6 is a larger, slower disk (70 Gb 10k rpm) that will also have more I/O contention than disks 1 - 5. (due to redo and archive on the same disk)
My questions are:
I hope this makes sense, it has been a long day.
Thanks,
Chuck
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