Quote:> I know im not the first to ask this but can anyone here share there
> recommendations ? Sun is telling us to use Raid 5 for Oracle redo/archive
> logs but our DBA's is pushing for 0+1 with partner pairs which consumes
> two much disks I dont think it justify the cost. Anyone have any
> recommendations ? were using 6960 iirc 1gig of cache per brick.
You ought to be able to figure out your logging needs from the rate at which
your application generates log data and your tolerance for slightly
increased response times if you use RAID-5 and log forces require small
updates to disk. For some installations, RAID-5 will prove adequate, for
others less so.
If your array provides battery-backed write-back cache such that log disk
writes can be safely deferred until, e.g., they fill up a full RAID-5
stripe, then a RAID-5 log should provide about the same throughput (and
response times) as a mirrored log of the same usable capacity (while
requiring only a bit more than half the disks).