Why not set it up as RAID?
Paul M Foster wrote:
>On Mon, Dec 08, 2003 at 08:07:37PM -0500, Eben King wrote:
>
>
>
>>Hi. I got a spare drive (hdc now), that is the same model (IBM/Hitachi
>>IC35L120AVV207-0) as my main drive. Both are 120 decimal GB (~= 115
>>binary GB). Right now I've set up a nightly 5am block copy copy (using
>>dd) hda -> hdc. I realize this is not the most efficient method of copy,
>>but as it's a personal system and unused at that time of the morning, the
>>time taken isn't a problem. When I press the backup drive into service, it
>>will appear as if the power had just been restored after an unclean
>>shutdown. "sync" runs every minute to reduce the amount of data in
>>unflushed buffers.
>>
>>The reason I wanted to do a block copy was that that was the only way I
>>could think of to maintain partitions (if I repartition the main drive,
>>the backup drive gets repartitioned automatically), and copy boot sectors
>>and the like.
>>
>>Can anybody think of a better way to do what I'm trying to do?
>>
>>
>
>Caution: dd will replicate errors on the source drive to the target
>drive. But I don't know much else that makes byte-for-byte copies (of
>course, that means almost nothing, since I never looked for an
>alternative). And I suspect anything that makes an image copy will
>replicate errors. In fact, this could be a problem if errors crop up on
>your source drive, necessitating e2fsck. Those won't be fixed on your
>target drive until your next image copy.
>
>If you weren't trying to compensate for repartitioning and the like, I'd
>say rsync is your best bet. I use it extensively, and it will keep
>things completely in sync between the two drives.
>
>Paul
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