Date: Mon, 05 Sep 2005 11:46:03 -0400 From: Chuck Swiger <cswiger@mac.com> To: Jeff Tchang <jeff.tchang@gmail.com> Cc: freebsd-performance@freebsd.org Subject: Re: 3Ware 7500-4 Slow Message-ID: <431C683B.1080803@mac.com> In-Reply-To: <63f9d26505090417183dff415e@mail.gmail.com> References: <63f9d26505090417183dff415e@mail.gmail.com>
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Jeff Tchang wrote: [ ... ] > When I attempt to write many small files or remove a directory is when the > slowness kicks in. Is this just something due to Raid5? Here is the output > of Bonnie++: Small writes are pretty much the worst-case scenario for RAID-5, and it's normal to see a very significant performance drop-- by up to an order of magnitude-- from the performance of a bare drive. Good RAID controllers with lots of RAM can reduce the performance hit to perhaps less than a factor of 2. Choosing RAID-1 rather than RAID-5 for situations which are not read-only or read-mostly is probably a good idea. -- -Chuck
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