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3ware 9500s raid 5 on i7 920 SLOOOW! Need help!

Last response: in Storage
April 16, 2010 4:22:13 AM


Im having problems with SLOW Read/Writes on my 3ware 9500s Controller:

Im lucky to get 10-20MB's read/write on either of the two arrays
Ive turned on write cache (even though I dont have BBU

1x RAID 5 (4x 1tb WD drives 128kb stripe)
1x RAID 5 (3x Seagate drives 64kb stripe)

Win 7 64bit
i7 920
6gb ddr3
gigabyte ga-x58a-ud3r

3ware 9500s (pci slot)

Either way Im not impressed. If I cant get some decent performance Im going to have to look at upgrading. If this is the case then maybe someone any suggest a good replacement (dont really want to spend more than $300-350 NZD or $200USD shipped from ebay etc)

Cheers, Pete
a c 415 G Storage
April 16, 2010 4:40:30 AM

RAID-5 volumes have very poor write performance. If by having slow "Read/Writes" you mean, for example, that a file copy that's going TO a RAID-5 set is slow, then that's to be expected.