disk cloning by dd command

[sarfaraj ahmad]

i had started backup through dd command but after some hours my session timed out and disconnected.
now how can i know that backup is completed successfully or not?
is there any log message where these information stores?
i have checked already /var/adm/syslog/syslog.log, /var/mail/root and dmesg, but nothing found.
can anybody tell me how can i confirm about the backup.
thanks.

[Steven E. Protter]

Shalom,

Safe thing to assume without data is the backup failed. If you need it and its not there the disappointment will be large.

What you can do is this:

Scripted backup

dd command
rc=$?
# This is a return code. zero means successful.
if [ $rc -eq 0 ]
then
echo "Backup succeeded"
else
echo "Backup failed"
fi

SEP

[Dennis Handly]

>my session timed out and disconnected.

I suppose it could have worked but the stderr output indicating any issues was lost. You could redirect the output and use nohup to put it in the background.

>is there any log message where these information stores?

Only to your terminal, if you didn't redirect it.

>can anybody tell me how can i confirm about the backup.

dd(1) isn't really a backup utility, it is a raw copying command.
It's not like there is a length on the target so you can see how much was copied.

[sarfaraj ahmad]

thank you very much for your reply.