Guest Thinkpad21 Posted March 26, 2008 Posted March 26, 2008 Hi, On a Windows 2008/Exchange 2007 SP1 Mailbox CCR Cluster ( Local disks with RAID ), what is the best/recomanded configuration for the stripe-unit size. Thanks !!!
Guest John Fullbright Posted March 26, 2008 Posted March 26, 2008 Re: stripe-unit size for Windows 2008/ Exchange 2007 Generally, a low multiple of the IO size. 32K or 64K would be a starting point. "Thinkpad21" <thinkpad21@yahoo.com> wrote in message news:u2n%23o71jIHA.748@TK2MSFTNGP04.phx.gbl... > Hi, > > On a Windows 2008/Exchange 2007 SP1 Mailbox CCR Cluster ( Local disks with > RAID ), what is the best/recomanded configuration for the stripe-unit > size. > > Thanks !!! > > >
Guest Tarek Ismail Posted March 27, 2008 Posted March 27, 2008 Re: stripe-unit size for Windows 2008/ Exchange 2007 Microsoft Exchange Server 2007 writes data in multiples of 8-kilobyte (KB) I/O operations, and I/O operation to a database can be from 8 KB to 1 megabyte (MB). Therefore, make sure that the starting offset is a multiple of 8 KB. Failure to do so may cause a single I/O operation spanning two tracks, causing performance degradation. If your storage vendor does not have any specific recommendations, Microsoft recommend that you use 64 KB. -- Tarek Ismail Infrastructure Consultant OMS
Guest John Fullbright Posted March 27, 2008 Posted March 27, 2008 Re: stripe-unit size for Windows 2008/ Exchange 2007 In Exchange 2007, an IO to the database is 8K. An IO to the logs cam be 512 bytes to 1MB. If you use a backup program that does not leverage snapshots and instead uses backupo API, then use 64K because many backup API applications read in 64K chunks. If you use snapshots, it really depends on the cache architecture of your storage. COnsult your storage vendor. "Tarek Ismail" <Tarek_877_nospam@hotmail.com> wrote in message news:9E859CD2-EBC6-4DA3-9B94-CC56CD45708F@microsoft.com... Microsoft Exchange Server 2007 writes data in multiples of 8-kilobyte (KB) I/O operations, and I/O operation to a database can be from 8 KB to 1 megabyte (MB). Therefore, make sure that the starting offset is a multiple of 8 KB. Failure to do so may cause a single I/O operation spanning two tracks, causing performance degradation. If your storage vendor does not have any specific recommendations, Microsoft recommend that you use 64 KB. -- Tarek Ismail Infrastructure Consultant OMS
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