:> 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.
Well, 'more then one disk' operations anyway, for random-I/O. Caching
takes care of sequential I/O reasonably well but random-I/O goes down
the drain for writes if you aren't spindle synced, no matter what
the stripe size, and will go down the drain for reads if you cross
a stripe - something that is quite common I think.
-Matt
Matthew Dillon
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