Piergiorgio Sartor wrote:
Hi all,
I'll have to setup some machines with two HDs (each)
in order to get some redundancy.
Reading the MD features I noticed there are several
possibilities to create a mirror.
I was wondering which one offer the best perfomances
and/or what are the compromises to accept between
the different solutions.
One possibility is a classic RAID-1 mirror.
Another is a RAID-10 far.
There would also be the RAID-10 near, but I guess
this is equivalent to RAID-1.
Any suggestion on which method offers higher "speed"?
Or there are other possibilities with 2 HDs (keeping
the redundancy, of course)?
Mirrored array will offer slower write speed no matter how you do it,
usually about the speed of a single drive. With raid10 far you should
get about N times faster read than a single drive, where N is drives in
the array. Clearly using three or more drives will help a LOT in typical
performance.
--
Bill Davidsen <davidsen@xxxxxxx>
"Woe unto the statesman who makes war without a reason that will still
be valid when the war is over..." Otto von Bismark
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