Hi everyone,
This is not purely OpenSolaris but still Solaris + STK2540 related.
I'm trying to do some benchmarking using a STK2540 with a JBOD. The
disks inside are 1TB SATA each. The array is connected to a T5240 with
dual-port 4Gb links and MPXIO enabled. All my pool configurations has
a 128kb stripe size since I'm using ZFS for all my tests. ZFS cache
flush is disabled in /etc/system. I'm trying to understand the
performance I'm seeing.
If I create a simple RAID0 with one single disk and write to it with a
simple "dd if=/dev/zero of=bigfile.1 bs=128k" then I'm getting a
mighty 12MB/s writing speed. If I put together more of these disks it
scales in a linear fashion, each drive is able to write with 12MB/s.
I've done a lot of these tests and my last test was to create four
RAID1 pairs with two disks each. I created a ZFS stripe pool using
these four pairs and did the same test.
0.0 100.0 0.0 12.5 0.0 35.0 0.0 349.9 0 100
c4t600A0B8000493CC4000003ED48457620d0
0.0 99.0 0.0 12.4 0.0 35.0 0.0 353.5 0 100
c4t600A0B8000493481000003B9484576B5d0
0.0 97.0 0.0 12.1 0.0 35.0 0.0 360.8 0 100
c4t600A0B8000493CC4000003EF484576F2d0
0.0 98.0 0.0 12.3 0.0 35.0 0.0 357.1 0 100
c4t600A0B8000493481000003BB48457789d0
This seems to be the performance I'm getting. 12MB/s per pair, asvc_t
of 350ms (??) and 100% busy.
Clearly this is not the performance I expect from such a simple test
(yes, dd is not a good test but I would expect slightly better
sequential write speed especially with zfs) but after googling a lot I
can see people are happy with their arrays. My question is what kind
of performance do people get from SATA disks in a STK2540? What can I
expect? Is there anything to tune?
I would be grateful if anyone could share their experience with
STK2540/2530 and SATA drives because it doesn't seem to be a a too
common setup judging from the results I get from Google.
cheers,
Nickus
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