Date: Sat, 30 Mar 2002 06:39:16 +0800 From: "Derek Barrett" <derekbarrett@graffiti.net> Cc: freebsd-hardware@FreeBSD.ORG Subject: Re: RAID: Adaptec vs Mylex Message-ID: <20020329223917.20129.qmail@graffiti.net>
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I just wanted to amend this and say some of my information was incorrect. It seems after reading some more, that a 32 or 64K stripe size on the RAID is actually very good, and is even recommended by Oracle for OLTP. This is one of the best articles on striping I have come across, and I have spent days and days and days researching this topic: http://www.oracle.com/oramag/oracle/00-May/index.html?o30avail.html ----- Original Message ----- From: "Derek Barrett" <derekbarrett@graffiti.net> Date: Wed, 27 Mar 2002 15:20:30 +0800 To: "David Miller" <dmiller@sparks.net> Subject: Re: RAID: Adaptec vs Mylex > We chose the Adaptec 2400A for its friendly compatibility with > FreeBSD. FreeBSD 4.4 and 4.5 have both detected it instantly, > and there were no conflicts with another RAID card in our > chassis, it liked both. Adaptec seems to be the only company > out there that goes out of its way to support ATA RAID for > FreeBSD. Of all the companies we looked at, support was marginal > at best. Though the SCSI cards had alot more FreeBSD support. > > The RAID utilities that come with it also have native FreeBSD > versions, one is written as a package, and another will install > through a setup script. Very handy. 2400A supports RAID0,1,5, and > 10. I read today some documentation regarding RAID 0/5, but we only > have one Adaptec card right now so I don't know if that is working on > this particular this card. > > Another comment is that their customer service seems to be > well done from what I have seen so far. I asked a couple of > questions by email last night, and they were responded back > today, and the answers they gave me were very helpful and professional. > > The only thing I was disappointed about was that we could not change > the stripe size on RAID10 (which is set to 64K). You can change > the stripe size on the RAID0 and RAID5, they go from 8K to 256K. > So we are using RAID5 with a 16K stripe size. For you database users > using smaller block sizes, it looks like you'd have to stick > with RAID5 on this card. > > Does anyone out there use a small stripe size on their RAID10? > Like 8K or 16K? Does going to the small stripe size defeat the > purpose of the RAID10, and possibly that's why it is stuck at > 64K on this card? (In this case, since there are two RAID 1 > arrays within the RAID0, the actual stripe to those becomes > 32K, since 64/2 = 32K, but that's still too big for our > purposes). > > > > On Tue, 26 Mar 2002 15:30:56 -0500 (EST), "David Miller" > > <.ndmiller@sparkset> said: > > > Any input from real world users on the subject? I'm most interested in > > > the 3210S and 352. My use would be with RAID 10 support of a busy > > > database server doing zillions of writes/updates. Speed writing small > > > blocks is of the essence. > > > > > > Reliability, robustness, speed are critical factors. It will be hooked > > > up > > > to 10 or 12 15K drives. > > > > > > Input? > > > > > > Thanks, > > > > > > --- David > > > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > > with "unsubscribe freebsd-hardware" in the body of the message > > > > > > > -- > > > > derekbarrett@fastmail.fm > > > > > > -- > > _______________________________________________ > Get your free email from http://www.graffiti.net > > Powered by Outblaze > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-hardware" in the body of the message > > -- _______________________________________________ Get your free email from http://www.graffiti.net Powered by Outblaze To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hardware" in the body of the message
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