SCO 5.0.5 dd / clone

Hi,

I have an odd problem with one of my customer's SCO machines.

Without going into a lot of detail and reasons for backup decisions, I
have implemented a dd cloning of the master hard disk to a backup disk.
That is to say my customer has 2 hard disks (in a caddy), the primary
or master disk (hd00) and the clone or backup disk (hd10). A cron job
wakes up twice daily and does a complete clone of the master disk to
the backup / clone disk using dd. No great issue here as the entire
disk (20Gb) takes about 24 minutes to complete. Now in Linux, this
works great. If the master disk crashes for any reason, the customer
simply re-boots their system and boots from the secondary drive whilst
the primary is being repaired and all boots up fine and proper and no
problems.

However, the same process in SCO 5.0.5 seems to generate a completely
corrupted disk. When I compare the master to the clone, you can see
that the clone is completely a mess. I don't understand why this is the
case with SCO but not with linux. As I'm doing a dd of the ENTIRE disk
(a binary bit by bit copy), I don't understand why it doesn't work
under sco. BTW - in SCO I don't boot from the secondary drive - I have
to set it to the master drive first however, as per above the disk is
so badly corrupted that the boot process will not work.

The command I use is

time dd if=/dev/hd00 of=/dev/hd10 bs=1451520 count=12529 (for SCO)
time dd if=/dev/hda of=/dev/hdb bs=1451520 count=12529 (for linux)

Some additional info. If I use a "live cd" to boot and do the above
clone for sco it all works fine - hence I confirm that my drives and
controller are healthy. The problem only occurs only if I boot the HDD
(primary disk) and then try the dd clone. So obviously dd doesn't seem
to like doing something on a running system but not sure why this
should be so. Again, under a running Linux system this works perfectly
fine.

Any ideas or help would be appreciated - thanks.

Rgds. Otto Rodusek. (otto@xxxxxxxxxxxxxx)

.

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