On Fri, Jun 18, 2010 at 4:42 AM, Pasi Kärkkäinen <pa...@iki.fi> wrote:
> On Fri, Jun 18, 2010 at 01:26:11AM -0700, artiepen wrote: > > Well, I've searched my brains out and I can't seem to find a reason for > this. > > > > I'm getting bad to medium performance with my new test storage device. > I've got 24 1.5T disks with 2 SSDs configured as a zil log device. I'm using > the Areca raid controller, the driver being arcmsr. Quad core AMD with 16 > gig of RAM OpenSolaris upgraded to snv_134. > > > > The zpool has 2 11-disk raidz2's and I'm getting anywhere between 1MB/sec > to 40MB/sec with zpool iostat. On average, though it's more like 5MB/sec if > I watch while I'm actively doing some r/w. I know that I should be getting > better performance. > > > > How are you measuring the performance? > Do you understand raidz2 with that big amount of disks in it will give you > really poor random write performance? > > -- Pasi > > i have a media server with 2 raidz2 vdevs 10 drives wide myself without a ZIL (but with a 64 gb l2arc) I can write to it about 400 MB/s over the network, and scrubs show 600 MB/s but it really depends on the type of i/o you have....random i/o across 2 vdevs will be REALLY slow (as slow as the slowest 2 drives in your pool basically) 40 MB/s might be right if it's random....though i'd still expect to see more.
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