Date: Wed, 14 Feb 2007 23:29:27 -0500 From: "Dak Ghatikachalam" <dghatikachalam@gmail.com> To: "Derek Ragona" <derek@computinginnovations.com> Cc: FreeBSD - Questions <freebsd-questions@freebsd.org> Subject: Re: RAID 10-LUN Question Message-ID: <ba29b9b40702142029g6353485av5e2821a1b251f2f6@mail.gmail.com> In-Reply-To: <6.0.0.22.2.20070214161344.0278ad60@mail.computinginnovations.com> References: <ba29b9b40702141254v4ca8e5c9n21ee1083781c37dc@mail.gmail.com> <6.0.0.22.2.20070214161344.0278ad60@mail.computinginnovations.com>
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At 02:54 PM 2/14/2007, Dak Ghatikachalam wrote: Hi Freebsd We have DELL/EMC CX-300 storage array hardware , Navisphere. , which consist of 15 Disks 320GB, I am planning to use this for Oracle( Linux) + SQL server(M$) purpose. We need to get that redundancy using RAID 10 and striple for the best performance. My thoughts are take most even number of possible disks( leaving private system partition area) and create the raid groups and kick a separate LUNS for MSSQL purpose. With this hardware config, Do you have any suggestion on getting the best performance and redundancy in place Thanks Dak On 2/14/07, Derek Ragona <derek@computinginnovations.com> wrote: > > RAID 10 uses even numbered drive sets, usually in 4's, so 4 drives, 8 > drives, 12 drives, etc. Depending on how 24/7 self-managed you want the > array, you should plan for at least 2 hot spare drives for fail over. > > So in your setup you could have one logical array made up of 12 drives, > with 2 spares, and one left for the OS. One consideration in striping is > the stripe size. Stripe size effects performance but also storage > efficiency. So you want to balance those factors in choosing a stripe size. > How to determine the stripe size Dell recommends the OS striped across 5 disks and calls itself system private paritition How to determine the optimal stripe size, will I be able to ditch the current navisphere the Storage Array OS( which is now windows based I t and stick Freebsd in its place. We have got nice GEOM ability now. Thanks Dak One last issue, is make sure you have enough cache on the RAID controller. > > -Derek >
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