Maciej Suszko a écrit :
FreeBSD <[EMAIL PROTECTED]> wrote:
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
Thanks for reply Martin,
I think I'm not gonna take the risk and I stay with PERC5 controller.
Have you used integrated PERC5 or external one? And one more question -
how about controller monitoring - there is a sysutils/linux-megacli,
have you tested it? Is it working with your PERC?
I have the PERC5/i but I can't say that it is "integrated". It's a
PCI-Express x4, IIRC. I think that the difference between the I and E is
that the E would have an external connector, but I can't say for sure. I
think you should stay with the PERC5/i and I think that the E is more
expensive too.
For the monitoring, I never tried linux-megacli because (for no good
reason) I'm not a fan of linux emulation. Instead, I did a small shell
script that grep /var/log/messages for entries related to mfi and email it
to me. The messages in case of failure are pretty clear. I put the script
in crontab so that it runs every half-hour. It does the job very well for
me.
Martin
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