SCSI RAID Question

[Bozo]

If you have a SCSI adaptor that is U320 and supports RAID 0, is there any performance gain using U320 hard drives? Wouldn't the card be maxed out with 1 U320 drive? Do you need a dual channel card with one drive on each channel? (presumming each channel is U320 each) It would seem the total for the card is U320.

Thanks,

Bozo :mrgrn:

 

[The JoJo]

If one drive is capable of a max sustained transfer rate of ~100MB/s, there's still room for others before they reach 320MB/s.

With this logic, presuming all the work would be sequential on the drive, it would take at least 3+ drives to max out the channel. As most work is not sequential, you could put more drives on the channel before the bus/channel would the the bottleneck.

The U320 just means the drive supports the latest spec.

 

[The JoJo]

The U320 is applicable for one channel. If it's a dual channel card, then both channels support 320MB/s.

 

[Mercutio]

And PCI only supports whatever PCI it is... probably slower than the transfer rates on the card. That would be the limiting factor in that case.