Software mirroring is slower and adds workload to the CPU. However, depending on the load, this may not make much of a difference.
Also, (at least on W2K mirroring) the information used by the OS to do the mirroring is stored on the primary drive. If that hard drive goes bad in the area that stores that info., you have to do low-level editing of the disk to recover to the mirrored drive. In the case I dealt with this was a not very fun, 5 hour call to MS PSS. Even when the other drive was back up, the volume mapping was corrupted (D: was W:, C: was Q:, etc.). Ended up reloading the server. Don't take this as an absolute technical fact since I'm going off memory here.
Moral of the story: stay away from software mirroring.
Hardware mirroring is handled by the controller on the card.
Much better option.
-- Chris Scott Host Orlando, Inc http://www.hostorlando.com/
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