:>     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.

                                        Matthew Dillon 
                                        <[EMAIL PROTECTED]>

To Unsubscribe: send mail to [EMAIL PROTECTED]
with "unsubscribe freebsd-current" in the body of the message

Reply via email to