[TriLUG] SAS vs. SATA performance

[Kevin Flanagan]

There's a lot more to the difference, the drives themselves may in that
order, but consider the controllers, channels etc.  Seek times, buffers,
rotational speed are surely considerations, but SATA disks are generally on
a smaller number of channels and ports than SAS drives.

Another consideration is the MTBF, HP advised me that the MTBF of a SAS disk
is 3 times greater than that of a SATA disk.



Kevin

On 7/26/07, bak <bak at picklefactory.org> wrote:
>
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> I don't have any hard data on hand to give you, but I would expect
> something on the order of 2x the operations per second (before latency
> gets unbearable) from a SAS drive compared to SATA, even at the same
> rotational speed.  Will that matter for what you're doing?  If your I/O
> is very random, definitely.  If it's very sequential, probably not so
> much.
>
> - --bak
>
> Lee wrote:
> > Does anyone have any info on SAS vs. SATA performance (at the same
> > RPM, 10k)?
> > -Lee
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