10-17-2005
Blocksize problem restoring file from tape
I was recently given the responsibility of the unix box at our work. Without much training, I now have to go back and restore a file from tape. I'm having some trouble with it. I'm getting an error with the blocksize.
The part of the script that does the tar looks like this:
tar cvfX /dev/rmt/0n backup_exclude_file /* /LAST_FILE >> /data/unix_backup.log
It doesn't seem like the script specifies the blocksize? Am I wrong?
This is the commands I executed to do the restore:
mt -f /dev/rmt/0 status
mt -f /dev/rmt/0 rewind
mt -f /dev/rmt/0n fsf 1
tar xvf /dev/rmt/0 /data/exports/files/C_XMDL.dmp.Z
It gives me this error:
tar block size =1
directory checksum error
I was told to try a blocksize of 2000, but it seems like the command just hung. I had to kill it after 2-3 hours.
This is what I excuted for that:
tar xvfb - 2000 /dev/rmt/0 /data/exports/files/C_XMDL.dmp.Z
We are using a Dell SDLT 320 Powervault 110T
I'd appreciate any suggestions.
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st(1M) st(1M)
NAME
st - shared tape administration
SYNOPSIS
device_file
DESCRIPTION
The command provides users with a command-line interface to check the status of a shared tape device or to reclaim a shared tape device
from a host system that has failed while holding a reservation on the shared tape device. The command can also be used for the same pur-
pose on shared library robotic devices. To use the command you must have root user id.
Please see examples below for usage.
Options
recognizes the following options and arguments:
Specifies the tape device file or sctl/esctl pass-through device
file for the shared tape/library device. This parameter is mandatory and will report an error if device_file is omitted.
Allows the user to reclaim a shared tape device or shared
library robotic device in the case where a host failed while holding a reservation on the shared device. This option causes
a bus device reset to be issued to the device specified by the option.
Prints out the current status of the shared tape/library
device specified by the option.
RETURN VALUE
returns 0 upon successful completion and 1 otherwise.
EXAMPLES
The following shows three examples of output from the above command.
The above output indicates that the shared device is reserved by another host and is therefore unavailable at this time.
The above output indicates that the shared device is not ready for use at this time.
The above output indicates that the shared device is ready for use at this time.
To reclaim a shared tape/library device from a failed host, the following command can be used:
WARNINGS
The option must be used with care. When reclaiming devices, it must be ensured that the host from which the device is being reclaimed has
in fact failed, as data may be lost as the result of reclaiming a device that is currently in use by another host.
AUTHOR
was developed by Hewlett-Packard.
SEE ALSO
mt(1), scsi(7), scsi_ctl(7).
st(1M)