Maciej Suszko a écrit :
I think about buying Dell PE2950 with SAS 6/iR integrated RAID
controller. It would be double Intel Quad Core Xeon E5420 with 3.5" SAS
15k RPM disks connected to SAS 6/iR RAID controller.
I'm curious if anyone is running FreeBSD-7.0-RELEASE on such machine
and if there any problems with this controller - is SAS 6/iR supported
by mpt or mfi? Anyone happily using it?
I never tried SAS 6 but I have SAS 5 in a few Dell servers and it's
performance is horrible. I tried some tips I read to optimize the
performance but none worked (I must admit that I didn't tried that hard
but still...). Just to compare, I have the exact same disk (the same
3,5" SAS 15K that you plan to buy) in a PowerEdge 860 with SAS 5 and in
a PowerEdge 1950 with PERC5 (both in RAID 1) and the performance are
like day and night (tested with dbench):
SAS 5: Throughput 98.9811 MB/sec 4 procs
PERC5: Throughput 321.704 MB/sec 4 procs
The last server I bought is a PowerEdge 840 with PERC5 but this time
with 7200RPM SATA drives (3 in RAID 5) and the performance is still
impressive : Throughput 266.81 MB/sec 4 procs
I highly recommand upgrading to the PERC controller.
SAS5 is recognized by the mpt driver and PERC5 by mfi.
YMMV,
Martin
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