Hi Nickus, have you succeeded to get more than 12 MB/s writing speed on Sata disk ?
I'm faced with the same problem. Thanks, Ben > 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 > 600A0B8000493CC4000003ED48457620d0 > 0.0 99.0 0.0 12.4 0.0 35.0 0.0 353.5 > 0 100 > 600A0B8000493481000003B9484576B5d0 > 0.0 97.0 0.0 12.1 0.0 35.0 0.0 360.8 > 0 100 > 600A0B8000493CC4000003EF484576F2d0 > 0.0 98.0 0.0 12.3 0.0 35.0 0.0 357.1 > 0 100 > 600A0B8000493481000003BB48457789d0 > > 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 > _______________________________________________ > storage-discuss mailing list > [email protected] > http://mail.opensolaris.org/mailman/listinfo/storage-d > iscuss -- This message posted from opensolaris.org _______________________________________________ storage-discuss mailing list [email protected] http://mail.opensolaris.org/mailman/listinfo/storage-discuss
