Re: SCSI Disk/Controller advice please
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- Subject: Re: SCSI Disk/Controller advice please
- From: Frank Gevaerts <firstname.lastname@example.org>
- Date: Mon, 1 Nov 2004 15:22:17 +0100
- Message-id: <20041101142216.GA23216@gevaerts.be>
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On Mon, Nov 01, 2004 at 09:28:32AM +0800, Paolo Alexis Falcone wrote:
> Here's the case here - RAID 1 indeed does not mirror physical disk
> errors (else there's no real point in using RAID at all). However,
> should there be errors in the disks during reconstruction of the RAID
> array, RAID 1 won't save you as the errors would propagate anyway.
> RAID 5 alleviates this by using parity information stored across the
> disks - now it takes more than 1 disk failure for RAID 5 to fail.
How does this change anything ? If you have one failed disk, and one
disk containing unknown errors (the same case as your RAID1 example
above), replacing the failed disk will lead to errors on the new disk.
"Debugging is twice as hard as writing the code in the first place.
Therefore, if you write the code as cleverly as possible, you are,
by definition, not smart enough to debug it." - Brian W. Kernighan