Gregory K. Ruiz-Ade wrote:
On Mar 13, 2006, at 10:26 AM, Dexter Filmore wrote:

-Promise FastTrak SX4000 PCI

Whatever you do, stay away from Promise. It's only partial-hardware raid; most of the work is actually done by the driver, not the card. Pain in the ass to get working properly in Linux, too.

Seconded, avoid Promise. I would avoid them because of bad support. I think some of their newest do support hardware RAID5, though.

First question: Why RAID?

RAID invokes a bunch of problems and management that should probably be avoided unless you have a good reason. Is this for backups? Lack of size on drives? eg. need greater than 300-400GB in one partition? Reliability? How valuable is staying up?

Second question: Why RAID 5?  Why not something like RAID 10?

RAID 5 hurts write performance pretty badly even with hardware cards. And RAID 5 only protects against 1 drive failure until you rebuild the array. Multiple drive failures are no longer uncommon.

-a




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