Hi, Thank you for sharing it. Seems like it's more cheaper than the HBA from LSI, isn't it?
Can you tell us the build version of the opensolaris? best regards, hanzhu On Fri, Mar 12, 2010 at 8:52 AM, Russ Price <rjp_...@fubegra.net> wrote: > I had recently started setting up a homegrown OpenSolaris NAS with a large > RAIDZ2 pool, and had found its RAIDZ2 performance severely lacking - more > like downright atrocious. As originally set up: > > * Asus M4A785-M motherboard > * Phenom II X2 550 Black CPU > * JMB363-based PCIe X1 SATA card (2 ports) > * SII3132-based PCIe X1 SATA card (2 ports) > * Six on-board SATA ports > > Two 500 GB drives (one Seagate, one WD) serve as the root pool, and have > performed admirably. The other eight 500 GB drives (4 Seagate, 4 WD, in a > RAIDZ2 configuration) performed quite poorly, with lots of long freezeups > and no error messages. Even streaming a 48 kHz/24-bit FLAC via CIFS would > occasionally freeze for 5-10 seconds, with no other load on the file server. > Such freezeups became far more likely with other activity - forget about > streaming video if a scrub was going on, for instance. These pauses were NOT > accompanied by any CPU activity. If I watched what the array was doing using > GKrellM, I could see the pauses. > > I started to get the feeling that I was running into a bad I/O bottleneck. > I don't know how many PCIe lanes are being used by the onboard ports, and > I'm now of the opinion that two-port PCIe X1 SATA cards are a Very Bad Idea > for OpenSolaris. Today, I replaced the motley assortment of controllers with > an Intel SASUC8I to handle the RAIDZ2 array, leaving the root pool on two of > the onboard ports. Having already had a heart-attack moment last week after > rearranging drives, *this* time I knew to do a "zpool export" before > powering the system down. :O > > The card worked out-of-the-box, with no extra configuration required. WOW, > what a difference! I tried a minor stress-test: viewing some 720p HD video > on one system via NFS, while streaming music via CIFS to my XP desktop. Not > a single pause or stutter - smooth as silk. Just for kicks, I upped the ante > and started a scrub on the RAIDZ2. No problem! Finally, it works like it > should! > > The scrub is going about twice as fast overall, with none of the > herky-jerky action I was getting using the mix-and-match SATA interfaces. > > Interestingly about the SASUC8I - the name "Intel" doesn't occur anywhere > on the card. It's basically a repackaged LSI SAS3081E-R card (it's even > labeled as such on the card itself and on the antistatic bag), and came just > as a card in a box with an additional low-profile bracket for those with 1U > cases - no driver CD or cables. I knew that it didn't come with cables, and > ordered them separately. If I had ordered the LSI kit with cables from the > same supplier, it would have cost about $80 more than getting the SASUC8I > and cables separately. > > If you're building a NAS, and have a PCIe X8 or X16 slot handy, this card > is well worth it. Leave the two-port cheapies for workstations. > -- > This message posted from opensolaris.org > _______________________________________________ > zfs-discuss mailing list > zfs-discuss@opensolaris.org > http://mail.opensolaris.org/mailman/listinfo/zfs-discuss >
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