Alex Turner wrote:
The problem I see with software raid is the issue of a battery backed
unit: If the computer loses power, then the 'cache' which is held in
system memory, goes away, and fubars your RAID.
I'm not sure I see the difference. If data are cached, they're not written
whether it is software or hardware RAID. I guess if you're writing RAID 1, the
N disks could be out of sync, but the system can synchronize them once the
array is restored, so that's no different than a single disk or a hardware
RAID. If you're writing RAID 5, then the blocks are inherently error
detecting/correcting, so you're still OK if a partial write occurs, right?
I'm not familiar with the inner details of software RAID, but the only
circumstance I can see where things would get corrupted is if the RAID driver
writes a LOT of blocks to one disk of the array before synchronizing the
others, but my guess (and it's just a guess) is that the writes to the N disks
are tightly coupled.
If I'm wrong about this, I'd like to know, because I'm using software RAID 1
and 1+0, and I'm pretty happy with it.
Craig
---------------------------(end of broadcast)---------------------------
TIP 1: if posting/reading through Usenet, please send an appropriate
subscribe-nomail command to [EMAIL PROTECTED] so that your
message can get through to the mailing list cleanly
