I am experimenting with a scsi2 HP SureStore DAT24 attached as an external device to an Intel P4 system. I am attempting to create a raw disk image of a dds2 tape made on a non linux system.
My immediate problem is that I am trying to terminate a dd process and having no luck. dd was invoked thus:
dd if=/dev/nst1 of=/tmp/disk.dds2.img bs=512 & pid=$!
a ps reveals this:
ps PID TTY TIME CMD 1936 pts/0 00:00:00 bash 2034 pts/0 00:00:15 dd 2093 pts/0 00:00:00 ps
a call to kill has no apparent effect:
kill -s SIGKILL 2034 ps PID TTY TIME CMD 1936 pts/0 00:00:00 bash 2034 pts/0 00:00:18 dd 2100 pts/0 00:00:00 ps
and calls to mt show this:
mt -f /dev/nst1 status /dev/nst1: Device or resource busy
Short of a reboot, how do I get control of the tape drive back? (once I get the drive back I will have a lot of other questions regarding dd.)
Regards, Jim
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On Mon, 26 Sep 2005 at 4:17pm, James B. Byrne wrote
I am experimenting with a scsi2 HP SureStore DAT24 attached as an external device to an Intel P4 system. I am attempting to create a raw disk image of a dds2 tape made on a non linux system.
My immediate problem is that I am trying to terminate a dd process and having no luck. dd was invoked thus:
dd if=/dev/nst1 of=/tmp/disk.dds2.img bs=512 & pid=$!
a ps reveals this:
ps PID TTY TIME CMD 1936 pts/0 00:00:00 bash 2034 pts/0 00:00:15 dd 2093 pts/0 00:00:00 ps
That dd command will continue until it hits an EOF (I believe -- maybe EOD). Until then, it'll be in the 'D' state (waiting for I/O), and therefore unkillable. You'll just have to wait it out (or, as you conjectured, reboot). Is the tape drive reading (and, correspondingly, the disk writing)?
James B. Byrne wrote:
I am experimenting with a scsi2 HP SureStore DAT24 attached as an external device to an Intel P4 system. I am attempting to create a raw disk image of a dds2 tape made on a non linux system.
My immediate problem is that I am trying to terminate a dd process and having no luck. dd was invoked thus:
dd if=/dev/nst1 of=/tmp/disk.dds2.img bs=512 & pid=$!
... snip ...
Short of a reboot, how do I get control of the tape drive back? (once I get the drive back I will have a lot of other questions regarding dd.)
I assume that your reason for an early termination is that you want to look at some of the data w/o taking time for it all to be read in. If that is the case, just use the *count* arg to dd.
Sooner or later, you will need to read it all in so just do it now,
"nice" the "dd" process down and continue to use your system.
Hope this helps, Ray
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James B. Byrne -
Joshua Baker-LePain -
Raymond Lillard