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#1
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Tape Scanning in Linux
Hi,
Could someone kindly tell me how to scan tapes in Linux. For example, if there are multiple cpio archives on one tape, how can I find out how many are on it? If I am thinking correctly, cpio will only list whatever is the first archive it finds. Is it in the method of addressing the device? st0 and nst0 etc? or is there a utility or command that can essentially ls the tape in the drive? Thanks much, Robert |
#2
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Tape Scanning in Linux
2hawks wrote:
Hi, Could someone kindly tell me how to scan tapes in Linux. For example, if there are multiple cpio archives on one tape, how can I find out how many are on it? If I am thinking correctly, cpio will only list whatever is the first archive it finds. Is it in the method of addressing the device? st0 and nst0 etc? or is there a utility or command that can essentially ls the tape in the drive? I just wrote a script to do something very similar with some old Amanda tapes I have. Yours should be much simpler. I've changed it to do what I think you want: ======================= #!/bin/sh # Script to do a cpio inventory of a tape. # # Assumes: 1. /dev/tape - /dev/nst0 or other non-rewinding tape device # 2. not more than 100 tape files on the tape # 3. programs: mt, seq, cpio, grep, wc, and bc are in PATH # 4. mt reports "EOD" after end of last tape file is reached mt rewind for FILENUM in `seq 1 100` do echo "=============================" echo " Contents of file $FILENUM: " echo "=============================" cpio -tv /dev/tape # Check to see if we are at the end of the tape: END_TEST=`mt status | grep EOD | wc -l | bc` if [ "$END_TEST" = "1" ] then mt offline exit fi done ======================= While this isn't the most elegant script, it gets the job done. It will give a "Input/Output" error after it gets to the end of the last file because the status is EOF until the last cpio is done and then it goes to EOD. Anyone have a better solution to this? I'd run this as: ./ti.sh tape_1.log to save the inventory to a file. Good luck, Steve |
#3
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Tape Scanning in Linux
nice... thanks for that. That solves the cpio end of things for me I
guess. Now I wonder if that would work the same with tar.... or other methods of writing to tape. Trick for me would be to develop a script that just looked at the tape and did and ls of it... not dependent on cpio or anything. |
#4
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Tape Scanning in Linux
2hawks wrote:
nice... thanks for that. That solves the cpio end of things for me I guess. Now I wonder if that would work the same with tar.... or other methods of writing to tape. Trick for me would be to develop a script that just looked at the tape and did and ls of it... not dependent on cpio or anything. cpio will work with tar too. To check for what type of file is on the tape you could try putting something like this in your script: FILE_TYPE=`dd if=/dev/tape bs=32k count=1 | file -` and then figure out what to do based on what is in the FILE_TYPE variable. Have fun. Steve |
#5
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Tape Scanning in Linux
You are a gentleman and a scholar sir! Thanks for your assistance.
Btw, does anyone know if mt senses the actual block size when you do a status (mt -f /dev/nst0 status) or is that based on driver defaults? |
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