From mboxrd@z Thu Jan 1 00:00:00 1970 From: KELEMEN Peter Subject: Re: 3Ware 7506-8, anyone have any luck? I don't... Date: Fri, 15 Oct 2004 20:44:10 +0200 Sender: linux-raid-owner@vger.kernel.org Message-ID: <20041015184410.GC3035@inara.maison.net> References: <1097862002.13597.57.camel@tinny.home.foo> <20041015181205.GB3035@inara.maison.net> <1097864507.13828.70.camel@tinny.home.foo> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: QUOTED-PRINTABLE Return-path: Content-Disposition: inline In-Reply-To: <1097864507.13828.70.camel@tinny.home.foo> To: linux-raid@vger.kernel.org List-Id: linux-raid.ids [ Please do not address answers directly to me; I read the list. ] * Scott T. Smith (scott@gelatinous.com) [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 --=20 .+'''+. .+'''+. .+'''+. .+'''+. .+'= ' Kelemen P=C3=A9ter / \ / \ Peter.Kelemen@cer= n.ch =2E+' `+...+' `+...+' `+...+' `+...+' - To unsubscribe from this list: send the line "unsubscribe linux-raid" i= n the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html