peter-lists at hutnick.com
Fri Oct 11 06:06:59 MDT 2002
D. Stimits said:
> There is no technical reason to stop you, it'll work fine, but having
> slightly different specs can result in far less optimum throughput than
> with matched disks.
This is 100% correct.
> But for raid 5, those in series can be matched, and
> the one doing checksum would be nice as the 15krpm disk (till you lose a
This is nonsense. RAID 5 does not use an independent "checksum" (parity)
disk. It alternates, like:
Disk1 Disk2 Disk3
data data parity
parity data data
data parity data
.. . .
> You could use the 10k for separate swap, plus other things,
> like /tmp/, and gain other benefits. Raid 5 of course is not for
> performance reasons anyway, it is for the case of disk failure, so you
> will probably be reasonably happy with it.
This all makes sense, and is good advice if you use RAID-/4/, not 5. See
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