performance of 5 disk raid 5 vs 4 disk raid 1/0

Can anyone comment on the performance of a 4 disk raid 1/0 raid group vs a 5 disk (4+1) raid 5 raid group? This will be for an app that is almost exclusively small random writes.

Thanks,

John

Responses(2)

BRuehl

40 Posts

0

November 9th, 2007 11:00

If the app will be performing mostly writes, then the 1/0 solution would be better. RAID 5 tends to be better for read intensive applications. Writes to a RAID 5 suffer a performance penalty in calculating the parity.

DGM3

238 Posts

0

November 11th, 2007 21:00

See also the "EMC CLARiiON Best Practices for Fibre Channel Storage" whitepaper on Powerlink (search by title).
The "Sizing the storage requirement" section should be additionally helpful.

Regards,
DGM

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