Can you explain a bit that with what kind of configuration you can get that 770MiB/s performance? Thanks. ming On Fri, 2004-10-15 at 14:44, KELEMEN Peter wrote: > [ Please do not address answers directly to me; I read the list. ] > > * Scott T. Smith (scott@xxxxxxxxxxxxxx) [20041015 11:21]: > > > You know what, I think I was wrong -- we have the 8506. Sorry, > > my bad. And ours is SATA, not PATA (is that the difference > > between the 7xxx and 8xxx?) > > Yes. > > > There are other reasons the Highpoint is better than the 3ware, > > including the fact that it instantly recognizes when you yank a > > disk, unlike the 3ware which sits there for a while, and then > > hard resets the entire controller (thus halting all disk io to > > that controller for a couple of seconds). 3ware wrote me back > > and told me it's supposed to do that! > > Cannot comment on this one, never was a problem for us. > > > Is the 9500 a PCI-X card? > > No, it's 64-bit 66 MHz PCI. > http://www.3ware.com/products/pdf/9000DS_041904.pdf > > > [...] and we get the same crappy performance from that one too. > > Define `crappy': I get 770 MiB/s read with 3x 3ware 9500S-8MI. > (RAID00 hw-sw) > > > Worse yet, the 9xxx series wants to hijack your disks unless you > > go out of your way to enable 'export JBOD' mode. You can't take > > a disk from a 9xxx controller and put it in a box with an 8506 > > -- the controller won't recognize it! > > Have you tried zapping the first and the last megabyte of the > disk? > > > BTW I'm not talking about RAID or filesystem performance, I'm > > talking about direct disk access, JBOD mode, using rather large > > blocks. > > Direct disk access gives me nominal disk throughput on 3ware. > > > So really all I want is multiple controllers on a single card. > > To that end, the 1820a works great. I figure we'd all be > > running software RAID anyways ;-) > > As I said, attractive pricing. Cannot get stellar hardware RAID > performance with crappy chipsets. :-) There's a turnover point > where you are killed by PCI bandwith limit when using a lot of > disks. > > Peter - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
