From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from lists.gentoo.org ([140.105.134.102] helo=robin.gentoo.org) by nuthatch.gentoo.org with esmtp (Exim 4.43) id 1EBHcw-0004G4-B4 for garchives@archives.gentoo.org; Fri, 02 Sep 2005 19:55:06 +0000 Received: from robin.gentoo.org (localhost [127.0.0.1]) by robin.gentoo.org (8.13.4/8.13.4) with SMTP id j82Jp0h9003080; Fri, 2 Sep 2005 19:51:00 GMT Received: from moa.ifa.hawaii.edu (moa.IfA.Hawaii.Edu [128.171.168.48]) by robin.gentoo.org (8.13.4/8.13.4) with ESMTP id j82Jowik024289 for ; Fri, 2 Sep 2005 19:50:59 GMT Received: by moa.ifa.hawaii.edu (Postfix, from userid 1041) id B8A52B4056; Fri, 2 Sep 2005 09:56:16 -1000 (HST) Date: Fri, 2 Sep 2005 09:56:16 -1000 From: Joshua Hoblitt To: gentoo-amd64@lists.gentoo.org Subject: Re: [gentoo-amd64] Upgrading to Raid Message-ID: <20050902195616.GB31184@ifa.hawaii.edu> References: <20050901034637.38BC91B8BB@localhost.comcast.net> <43169348.1060109@albrookdata.com> <20050902100224.GA31184@ifa.hawaii.edu> <4318521A.60009@erols.com> Precedence: bulk List-Post: List-Help: List-Unsubscribe: List-Subscribe: List-Id: Gentoo Linux mail X-BeenThere: gentoo-amd64@gentoo.org Reply-to: gentoo-amd64@lists.gentoo.org Mime-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha1; protocol="application/pgp-signature"; boundary="IrhDeMKUP4DT/M7F" Content-Disposition: inline In-Reply-To: <4318521A.60009@erols.com> X-Archives-Salt: 7c1768a8-4056-40cc-be36-b709cb0b0d53 X-Archives-Hash: a9d7b074ad8d509ebecd9bee96d6bcbe --IrhDeMKUP4DT/M7F Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Supposedly the Areca cards offer much better RAID 5 performance. Since there is a driver in the -mm tree now I'm about to start testing a 24-port Areca SATA card. I have *no* experience with them as of yet so I can't recommend them. http://www.areca.com.tw/index/html/ -J -- On Fri, Sep 02, 2005 at 09:22:34AM -0400, Matt Randolph wrote: > That's valuable information indeed. Since migrating from Windows to=20 > Gentoo I have had to abandon an old PATA RAID 5 card because its Linux=20 > drivers haven't been maintained in years. I had thought about going the= =20 > 3Ware route, so I'm glad to hear about your experiences with their=20 > cards. I guess I have some more homework to do. Thanks for the heads-up! >=20 > Joshua Hoblitt wrote: >=20 > >I have a large number (more then a dozen) 3Ware 8500 and 9500 cards. > >The majority of these are 12-port SATA cards with RAID 5 volumes on > >them. > > > >Three quick observations: > > > >* Software RAID 5 on Linux WILL NOT remap bad blocks/sectors like a > >hardware RAID controller. If you care about your data, software RAID > >simply isn't an option. > > > >* The RAID 5 performance of 3Ware controllers is terrible. The 9500 > >series cards can push 50-55MB/s with xfs and in the neighborhood of > >45MB/s with ext3 (with an enlarged journal, etc.) for sequential writes, > >random I/O is even worse. The 8500 cards are about 10% slower compared > >to the 9500 once you fill up the on-card cache. > > > >* Neither xfs or ext3 are reliable on volumes greater then 2TB. Nor can > >fdisk even partition them (but lvm2 can handle them). > > > >Cheers, > > > >-J > >=20 > > > --=20 > gentoo-amd64@gentoo.org mailing list >=20 --IrhDeMKUP4DT/M7F Content-Type: application/pgp-signature Content-Disposition: inline -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.1 (GNU/Linux) iD8DBQFDGK5gWa2BU+b7tU0RAo88AJsGBNNArtuaHgKG10p5VMCJDUfDwwCfbkxQ dyG/P+0kYZGLaK+NtMa7/jE= =KnwC -----END PGP SIGNATURE----- --IrhDeMKUP4DT/M7F-- -- gentoo-amd64@gentoo.org mailing list