Re: Adaptec Storage Manager reports "No controllers were found in this system"
- From: Whoever <nobody@xxxxxxxxxxxx>
- Date: Fri, 16 May 2008 15:51:04 -0700
On Fri, 16 May 2008, Rob wrote:
Hello Aragorn,
You know your storage pretty well! I have also had the same experienc
where a customer would pair a Quad 4Gb FC (133Mhz) card with a crap
U160 card and drop the bus down to 66Mhz for both.
I thought I had done enough research when I purchaed my Dell Precision
and this Adaptec card. I had assumed that the card would run at
100Mhz (it should considering it cost almost $700). Anyway, the only
systems Dell sells with 133Mhz PCI-X slots are their rack mount
systems. I don't have a rack and putting a 1U box on a destop looks
retarded so I opted for the Dell Precision tower instead. Looks like
I made a bad call.
The motivation for this purchase was to improve my current NFS
performance. I've currently got a Dell Precision 490 (2P Xeon@3Ghz,
1GB RAM, Open SuSE 10.2) with a Dell PERC320 SCSI Controller (64Mb, 2
Channel, PCI-X) connected to a PowerVault 221S.
In this configuration, the PERC320 is also running at 66Mhz. The
storage is currently configured for RAID50 utilizing 10 drives (10k
RPM), 5 drives in each bay (with the storage tray setup in a 2x7
configuration, instead of a 1x14). I can only hope that the system is
concatinating two 4+1 strips with each stripe contained in each bay.
In this configuration I'm getting 56Mbps. I'm getting this number
using:
time dd if=/dev/zero of=/root/file.out bs=1MB count=1000
By comparison, my interal 7,200 RPM SATA drives (software mirrored
with LVM) are getting 80Mbps. Ove the Gig-E LAN, using NFS v3, I'm
getting about 10Mbps on the NFS exported PowerVault.
You are writing 1GB. Possibly all of that could be cached and you might not be seeing the performance of the controller and disk system. In my experience, RAID systems work well writing a single large file but suck badly when reading/writing a lot of small files.
You might want to install bonnie or bonnie++ to test performance. Another test to perform might be to create a RAM disk on the server, export it via NFS and then test the performance of the ramdisk over NFS.
.
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