Re: Western Digital "MyBook" as RAID?

On Sat, 16 Jun 2007 17:22:51 -0700, Joerg <notthisjoergsch@xxxxxxxxxxxxxxxxxxxxx> wrote:


AZ Nomad wrote:

On Sat, 16 Jun 2007 22:06:33 GMT, Robert <Robert@xxxxxxxxx> wrote:


Software RAID like you're talking about just duplicates files so if one gets
corrupt you have the other to recover from. Like synching files in two
locations but without the benefit of the two locations.

bull***.

Have you ever used a raid system in your life?

If you get a corrupted file, software (and hardware raid) will pass the
corruption to all drives in a mirrored array.


The purpose of raid is to provide enough redundancy to recover from drive
failures. If a drive in a mirrored volume fails, the other(s) can provide
the data.


I guess Robert meant corruption because of defects or failures in the
platter itself. But yeah, if a corrupt file is written onto disk A and
then mirrored it will of course be corrupt on disk B. However, that
should (theoretically) not happen if the file hasn't been touched after
corruption.

If either drive in a mirrored system get such soft errors, the file
will be trashed. RAID isn't a backup mechanism. It is a mechanism for
continueing after complete drive failures and to gain extra performance by
using multiple drives.
.

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