Hello Moritz, On 04/05/2012 02:36 AM, Moritz Wilhelmy wrote: > Hello Stephane, > > Thanks for the informative reply! > > On Thu, Apr 05, 2012 at 01:18:11 +0900, Stephane LAPIE wrote: >> Right now I'm using this controller : >> >> mpt0@pci0:6:1:0: class=0x010000 card=0x10aa1734 chip=0x00541000 >> rev=0x01 hdr=0x00 >> vendor = 'LSI Logic / Symbios Logic' >> device = 'SAS1068 PCI-X Fusion-MPT SAS' >> class = mass storage >> subclass = SCSI >> mpt1@pci0:6:7:0: class=0x010000 card=0x10aa1734 chip=0x00541000 >> rev=0x01 hdr=0x00 >> vendor = 'LSI Logic / Symbios Logic' >> device = 'SAS1068 PCI-X Fusion-MPT SAS' >> class = mass storage >> subclass = SCSI >> >> http://www.lsi.com/products/storagecomponents/Pages/LSISAS1068.aspx >> >> The only problem is, that card is an OEM version that was a bit tricky >> to find. >> I got it off an auction site in Japan, but I guess it covers pretty much >> what you want, >> in that it will advertise disks as physical volumes by default. > > I see. I'll try to get my hands on one, but anything that's hard to buy > is also not an option (as always with universities, there is already > enough bureaucracy involved). Unfortunately, this limits the choice of > hardware :-( I see :( >> My only complaint on FreeBSD 9.X so far is that, >> it has trouble doing SMART probes on the disks using passthrough :) > > Uh, that's bad with that many disks... How do you work around it, if at > all? I didn't manage yet :( I'm pretty much stuck... > >> Performance is top notch, even though I had to tweak my /boot/loader.conf >> to have a long SCSI timeout for disk detection (as you can imagine, >> 15 disks will take a LONG time to detect.) : >> kern.cam.scsi_delay=15000 > > How's the performance of the AOC-SAT2-MV8 compared to this one? I don't remember the exact figures. But given that the mvs(4) sometimes hanged up (most of the time silently, really bad times would have drives flap in and out), I say that mpt(4) comes out on top easy. Other than that... My testing was done using all of my Gbit interfaces and trying to max them all at once, and I could bust out something like 300-400MB/s in pure transfer speeds using HTTP.
I'm not sure if the zpool iostat are to be trusted, but I reckon mvs(4) would go up to 400MB/s while mpt(4) did go around 500-600MB/s... (take that with a healthy grain of salt) Cheers -- Stephane LAPIE, EPITA SRS, Promo 2005 "Even when they have digital readouts, I can't understand them." --MegaTokyo
signature.asc
Description: OpenPGP digital signature
