:For RAID3 that is true. For the other ones...
:
:> performance without it - for reading OR writing. It doesn't matter
:> so much for RAID{1,10}, but it matters a whole lot for something like
:> RAID-5 where the difference between a spindle-synced read or write
:> and a non-spindle-synched read or write can be upwards of 35%.
:
:If you have RAID5 with I/O sizes that result in full-stripe operations.
:
:--
:| / o / /_ _ email: [EMAIL PROTECTED]
:|/|/ / / /( (_) Bulte Arnhem, The Netherlands
Well, for reads a non-stripe-crossing op would still work reasonably
well. But for writes less then full-stripe operations without
spindle sync are going to be terrible due to the read-before-write
requirement (to calculate parity). The disk cache is useless in that
case.
-Matt
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