Date: Wed, 01 Oct 2008 22:58:05 -0500 From: Josh Paetzel <jpaetzel@FreeBSD.org> To: Wojciech Puchar <wojtek@wojtek.tensor.gdynia.pl> Cc: Danny Do <ai_quoc@hotmail.com>, Jeremy Chadwick <koitsu@freebsd.org>, freebsd-questions@freebsd.org Subject: Re: Optimal File System config for 2.5TB RAID5 Message-ID: <48E446CD.3090608@FreeBSD.org> In-Reply-To: <20081001111911.U8258@wojtek.tensor.gdynia.pl> References: <1222681181.48e0a25d094c3@www.inbox.lv> <BAY139-DAV13C8982A51CD9B05C74D5090430@phx.gbl> <48E21C66.8080407@FreeBSD.org> <BAY139-DAV5423DFBF403B32AA0C22690430@phx.gbl> <20080930161407.E16761@wojtek.tensor.gdynia.pl> <BAY139-DAV45B9F2CCF6913F5533E3090430@phx.gbl> <20080930205435.B20033@wojtek.tensor.gdynia.pl> <00ee01c92346$69508fa0$3bf1aee0$@com> <20080930224447.GA58065@icarus.home.lan> <20081001083637.C7317@wojtek.tensor.gdynia.pl> <48E33CC6.7050504@infracaninophile.co.uk> <20081001111911.U8258@wojtek.tensor.gdynia.pl>
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-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 Wojciech Puchar wrote: >> | | the simple answer is that software RAID on todays computers vastly >> | outperforms ANY hardware raid solution, maybe except the ones for >> 10000$ | or more. >> >> You're basically correct, but I think you're overestimating the price of >> a good RAID controller. > > no. please give me example of any RAID hardware below 10000$ that WILL > be faster than properly configure software RAID solution under FreeBSD > with same amount of same disks. > > i mean faster under normal unix-like load, which is lots of parallel > accesses to same or different things, not simple tests. > > > there are NONE. I have a number of systems running postgresql + a python web application that see fairly heavy concurrent access. The 3ware 9690SA outperforms gmirror and can be had in 4 port with the battery for $600 or so. 8 port with a battery is closer to $1000 Hardware RAID gets you boot support from stripes, email alerts for RAID events in many cases, and with a battery the option to turn write caching on on the controller. Unfortunately there are a number of bad and/or poorly supported RAID controllers out there, especially on FreeBSD. I'd never suggest to anyone that my highpoint 2300 or LSI 3041R-E are "high performance", but on the other hand, at real world tasks like a database that backs up a webserver doing millions of hits a day, the LSI 320-2E does RAID 10 faster than gvinum, and my 3ware 9690SA's are faster than gmirror at RAID 1, plus offer the option for a warm spare. Software RAID has advantages, namely hardware independance. And it can be faster than low end hardware RAID. But you don't have to spend much to get a hardware solution that will smoke software RAID at real world applications. - -- Thanks, Josh Paetzel PGP: 8A48 EF36 5E9F 4EDA 5ABC 11B4 26F9 01F1 27AF AECB -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.7 (MingW32) iD8DBQFI5EbNJvkB8SevrssRAvdLAJ96CLUVK3M2YLKNmAxmIPlxoqp+fgCgnLp6 H1OgEHevOKqDJ/FRg5+fHpU= =MQFo -----END PGP SIGNATURE-----
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