Re: Adaptec Storage Manager reports "No controllers were found in this system"

Whoever wrote:

On Fri, 16 May 2008, Rob wrote:

[...]
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. [...]

The performance of a RAID system depends on many things. First of all
there's the type of RAID. Secondly there's the stripe size. Thirdly
there's the number of disks in the array. Fourthly there's the intended
goal of the RAID array.

Trust me, the finetuning of a RAID array for performance is a whole subject
of its own, about which books have been written, and which many corporate
IT departments are still struggling with. ;-)

--
*Aragorn*
(registered GNU/Linux user #223157)
.

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