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Raid and Stripe Depth

Posted on 2000-03-20
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Last Modified: 2013-12-28
I'm setting up a hardware based Raid 5 configuration and wanted to know the significance of setting up raid depths.  The setup provides 8, 16, 32, 64, and 128k stripe depths.
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Question by:lofu
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michalb earned 50 total points
ID: 2639443
Raid Depth is actually a fragmentation level of whole RAID set. Usually chosen is 64k portions.
Windows NT RAID software uses one stripe depth - 64 kB.
Windows NT does not offer spare allocation because failed drives are manually replaced by the system manager. In opposition, hardware-based RAID solutions typically offer a variety of stripe depth options, such as 8, 16, 32, 64 and 128 kB. More sophisticated hardware solutions also offer spare allocation and priority settings on drive reconstruction.
Generally data type and types of I/O operations determines the size of stripe depth. The smaller stripe depth is used when accessing large databases, where large records are spanned across all drives and it takes less time to access this record- you are accessing all drives at once!. But there is a drawback - such configuration must be implemented in high quality arrays which offer drive synchronization. In other case all disk set must wait for last disk to finish I/O operation - with synchronization all drives are doing it at once. For small servers and home computers you should choose 64kb it will go well.
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by:lofu
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Thanks michalb.  That explains alot!
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