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Can RAID be enabled on SATA 150 and Sata 300 Hard Disks or should they be the sa

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March 9, 2010 9:26:11 AM

Hi,
We have received a server with two Hard Disks - one is SATA 300, the other sata 150. Will this cause an issue if we try to setup RAID 1?
a b G Storage
March 9, 2010 11:13:53 AM

No, but the array will operate at the speed of the slowest disk.
March 9, 2010 12:51:13 PM

Thanks for your reply - that solves my problem!
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a c 349 G Storage
March 9, 2010 12:52:43 PM

quite right. Hoever, almost no HDD's actually manage to move data to/from the mobo faster than a 150 Mb/s rate anyway, because the drive unit itself can't provide data to the buffer RAM any faster. Much of the time the communication system in a SATA II unit is waiting for data to move. So the impact will be small.

However, RAID1 is best done with well-matched drive pairs. If the drives are that different, do their other characteristics match well? Capacity, rotational speed, head seek times, average latency, buffer sizes - all those things that need some match. As chunkymonster suggests, any mismatch will be resolved to accommodate the slowest performer.
March 9, 2010 1:22:02 PM

Cheers!
!