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  3. August 2005

RE: Performance of 2780 controller and 141GB drives

Yes, a mirrored write involves writing to two disks, but the writes can
occur synchronously, negating any performance impact.  And there aren't
any parity calculations involved.  On RAID5, the parity for the write
operation has to be calculated and then several disks have to be written
to, potentially every disk in the parity set will have to be updated.
This may or may not occur synchronously but will involve a performance
penalty as the drive heads will have to seek to the parts of the drive
that contain the parity info.

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