[svlug] Re: 3ware IDE RAID Recommendation ...
rick at linuxmafia.com
Tue May 30 13:39:57 PDT 2000
begin Bryan -TheBS- Smith quotation:
> *BUT*, 3ware makes some excellent co-processed RAID controllers.
Sorry, I don't care if they're coprocessed: Using one IRQ per drive
pair is not OK. Neither is lack of hot-fix on the drives. Nor:
> One-channel per drive, a i960 (I believe) on-board to off-load the
> CPU, and FULL SCSI COMMAND-TAG QUEUING (even in the Linux driver)
Sorry, but if you're using ATA disks, by definition you cannot properly
implement SCSI-style command optimisation. Elevator seeking is not
possible, for example. The host adapter lacks the ability to properly
manage pending requests, because of the relatively primative
> -- a major key to performance (whereas the Promise cards are NO
> FASTER than software RAID in NT or Linux).
> This translates into a very cheap...
> ...and efficient...
Efficient of money: As I said, maximum possible redundant storage per
buck, at the expense of every other design objective.
> ...higher performance...
I doubt that, extremely.
> ...when you can't afford SCSI RAID.
Cheers, "Not using Microsoft products is like being a non-smoker 40 or 50
Rick Moen years ago: You can choose not to smoke, yourself, but it's hard
rick (at) linuxmafia.com to avoid second-hand smoke." -- Michael Tiemann
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