Date: Thu, 16 Mar 2006 10:38:05 -0800 From: "Don O'Neil" <don@lizardhill.com> To: "'Chuck Swiger'" <cswiger@mac.com> Cc: freebsd-questions@freebsd.org Subject: RE: Raidtest/3Ware 6000 Throughput Message-ID: <040601c64928$c3a4e140$0300020a@mickey> In-Reply-To: <44196B67.6090108@mac.com>
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I would have thought I would at least see the raw single drive throughput, plus maybe a bit more. I've benched these drives independantly at 20+ MB/second... Is the 3ware card really slowing things down that much with the RAID-5 overhead? What "real HW RAID-5" controller would you suggest? I'd like to stick with IDE/ATA since I have a bunch of drives already. Am I maybe CPU bound, or have another issue? -----Original Message----- From: owner-freebsd-questions@freebsd.org [mailto:owner-freebsd-questions@freebsd.org] On Behalf Of Chuck Swiger Sent: Thursday, March 16, 2006 5:43 AM To: Don O'Neil Cc: freebsd-questions@freebsd.org Subject: Re: Raidtest/3Ware 6000 Throughput Don O'Neil wrote: [ ... ] > Does this seem accurate? Should I only be seeing 4.7 MB/second > throughput or is raidtest just not a good way to measure peak throughput? > > Any thoughts would be appreciated. It does not astonish me that you get 5 MB/s on a RAID-5 config, although if you used SCSI and/or a real HW RAID-5 controller with significant cache (ie, 64+ MB) that would help the performance by quite a bit. Use RAID-5 for read-only or read-mostly situations and you'll be better off; use RAID-10 for write-heavy filesystems instead. -- -Chuck _______________________________________________ freebsd-questions@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/freebsd-questions To unsubscribe, send any mail to "freebsd-questions-unsubscribe@freebsd.org"
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