Date: Wed, 29 Aug 2007 20:43:07 +0200 From: Kirill Ponomarew <krion@voodoo.bawue.com> To: Vivek Khera <vivek@khera.org> Cc: FreeBSD Stable <freebsd-stable@freebsd.org> Subject: Re: large RAID volume partition strategy Message-ID: <20070829184306.GC42906@voodoo.bawue.com> In-Reply-To: <94ECF72B-B0E9-492C-8279-29989FAAE19C@khera.org> References: <31BB09D7-B58A-47AC-8DD1-6BB8141170D8@khera.org> <fa5b4v$8e5$1@sea.gmane.org> <EED39309-A95F-4A2D-8E35-C1650A55E482@khera.org> <fa5men$v5r$1@sea.gmane.org> <94ECF72B-B0E9-492C-8279-29989FAAE19C@khera.org>
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On Wed, Aug 29, 2007 at 10:07:19AM -0400, Vivek Khera wrote: > > On Aug 17, 2007, at 10:44 PM, Ivan Voras wrote: > >> >> fdisk and bsdlabels both have a limit: because of the way they store the >> data about the disk space they span, they can't store values that >> reference space > 2 TB. In particular, every partition must start at an >> offset <= 2 TB, and cannot be larger than 2 TB. > > Thanks. This is good advice (along with your other note about doing it in > the RAID volume manager). Nearly everyone else decided to jump on the raid > level instead and spew forth the "RAID10 is better for database" party > line. Well to you folks: once you have 1Gb cache and a lot of disks, there > is not much difference between RAID10 and RAID5 or RAID6 in my testing. What type I/O did you test, random read/writes, sequential writes ? The performance of RAID group always depends on what software you run on your RAID group. If it's database, be prepared for many random read/writes, hence dd(1) tests would be useless. > I ended up making 6 RAID volumes across all the disks to maximize spindle > counts and strip the data at 16kB. This seems to work well, and I can > assign the other partition as I need later on. > > _______________________________________________ > freebsd-stable@freebsd.org mailing list > http://lists.freebsd.org/mailman/listinfo/freebsd-stable > To unsubscribe, send any mail to "freebsd-stable-unsubscribe@freebsd.org" -Kirill
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