Khalid Aziz writes:
> Pete Zaitcev wrote:
>> Try "mt fsf" instead dd, see if that helps.
>
> dd is not guaranteed toposition you beyond the filemark after the
> first record. You have to be positioned beyond the filemark to start
> writing. Pete's suggestion is a good one. "mt fsf" will position
> the tape beyond the filemark and writing to the tape should work at
> that point.
Thankyou for the suggestions. However, mt reports that the tape is
positioned beyond the filemark before the failed write. Using "mt
fsf" doesn't make any difference - the problem still occurs.
sfere# cat t
#! /bin/sh
set -e
TAPE=/dev/nst0
hsize=512
set -x
mt -f $TAPE rewind
echo "tape 1" | dd conv=sync of=$TAPE bs=$hsize count=1
for x in 1 2 3; do
mt -f $TAPE rewind
dd if=$TAPE of=/dev/null bs=$hsize
date
mt -f $TAPE status
tar -c -b 20 -f $TAPE /boot
done
sfere# ./t
+ mt -f /dev/nst0 rewind
+ echo 'tape 1'
+ dd conv=sync of=/dev/nst0 bs=512 count=1
0+1 records in
1+0 records out
+ mt -f /dev/nst0 rewind
+ dd if=/dev/nst0 of=/dev/null bs=512
1+0 records in
1+0 records out
+ date
Wed Oct 31 09:06:24 GMT 2001
+ mt -f /dev/nst0 status
drive type = Generic SCSI-2 tape
drive status = 1191182848
sense key error = 0
residue count = 0
file number = 1
block number = 0
Tape block size 512 bytes. Density code 0x47 (unknown).
Soft error count since last status=0
General status bits on (81010000):
EOF ONLINE IM_REP_EN
+ tar -c -b 20 -f /dev/nst0 /boot
tar: Removing leading `/' from absolute path names in the archive
+ mt -f /dev/nst0 rewind
+ dd if=/dev/nst0 of=/dev/null bs=512
1+0 records in
1+0 records out
+ date
Wed Oct 31 09:06:59 GMT 2001
+ mt -f /dev/nst0 status
drive type = Generic SCSI-2 tape
drive status = 1191182848
sense key error = 0
residue count = 0
file number = 1
block number = 0
Tape block size 512 bytes. Density code 0x47 (unknown).
Soft error count since last status=0
General status bits on (81010000):
EOF ONLINE IM_REP_EN
+ tar -c -b 20 -f /dev/nst0 /boot
tar: Removing leading `/' from absolute path names in the archive
tar: Cannot write to /dev/nst0: I/O error
tar: Error is not recoverable: exiting now
sfere# cat ./t
#! /bin/sh
set -e
TAPE=/dev/nst0
hsize=512
set -x
mt -f $TAPE rewind
echo "tape 1" | dd conv=sync of=$TAPE bs=$hsize count=1
for x in 1 2 3; do
mt -f $TAPE rewind
# dd if=$TAPE of=/dev/null bs=$hsize
mt -f $TAPE fsf
date
mt -f $TAPE status
tar -c -b 20 -f $TAPE /boot
done
sfere# ./t
+ mt -f /dev/nst0 rewind
+ echo 'tape 1'
+ dd conv=sync of=/dev/nst0 bs=512 count=1
0+1 records in
1+0 records out
+ mt -f /dev/nst0 rewind
+ mt -f /dev/nst0 fsf
+ date
Wed Oct 31 09:14:16 GMT 2001
+ mt -f /dev/nst0 status
drive type = Generic SCSI-2 tape
drive status = 1191182848
sense key error = 0
residue count = 0
file number = 1
block number = 0
Tape block size 512 bytes. Density code 0x47 (unknown).
Soft error count since last status=0
General status bits on (81010000):
EOF ONLINE IM_REP_EN
+ tar -c -b 20 -f /dev/nst0 /boot
tar: Removing leading `/' from absolute path names in the archive
+ mt -f /dev/nst0 rewind
+ mt -f /dev/nst0 fsf
+ date
Wed Oct 31 09:14:52 GMT 2001
+ mt -f /dev/nst0 status
drive type = Generic SCSI-2 tape
drive status = 1191182848
sense key error = 0
residue count = 0
file number = 1
block number = 0
Tape block size 512 bytes. Density code 0x47 (unknown).
Soft error count since last status=0
General status bits on (81010000):
EOF ONLINE IM_REP_EN
+ tar -c -b 20 -f /dev/nst0 /boot
tar: Removing leading `/' from absolute path names in the archive
tar: Cannot write to /dev/nst0: I/O error
tar: Error is not recoverable: exiting now
sfere#
ttfn/rjk
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This archive was generated by hypermail 2b29 : Wed Oct 31 2001 - 21:00:43 EST