Date: Thu, 22 Sep 2005 22:13:59 -0400 (EDT) From: Francisco <francisco@natserv.net> To: Chuck Swiger <cswiger@mac.com> Cc: Jeff Tchang <jeff.tchang@gmail.com>, freebsd-performance@freebsd.org Subject: Re: 3Ware 7500-4 Slow Message-ID: <20050922215326.B50836@zoraida.natserv.net> In-Reply-To: <431C683B.1080803@mac.com> References: <63f9d26505090417183dff415e@mail.gmail.com> <431C683B.1080803@mac.com>
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On Mon, 5 Sep 2005, Chuck Swiger wrote: > Small writes are pretty much the worst-case scenario for RAID-5, Such as mail servers? How about for a DB server which is mostly read only? > normal to see a very significant performance drop-- by up to an order of > magnitude-- from the performance of a bare drive. At which point Raid 5 starts to perform better? 6,8,10 drives? How about RAID 10 for a DB server? I have been trying to convince the "powers that be" that SCSI would be much better.. but the price difference is just too astronomical for the capacities we need (500GB to 2 TB) Even 10K RPM IDE drives seem like would be a problem since they are mostly small in size.
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