tar backup (multivolume) error message

Discussion in 'Technical' started by kaza, Jan 1, 2010.

  1. kaza

    kaza New Member


    I attempted to perform a full backup using "tar" and a SCSI tape drive.
    The command issued (as a root) was:

    tar -cvMPf /dev/st0 --volno-file /root/backup/backup_vol_nums /*

    It started OK but after some time (I guess, when the first tape had
    been filled up) I've got the error message:

    tar: /dev/st0: Cannot close: Input/output error
    Prepare volume #2 for `/dev/st0' and hit return:

    I attempted to replace the tape and got the error message:

    tar: /dev/st0: Warning: Cannot open: No such device or address
    Prepare volume #2 for `/dev/st0' and hit return:

    From that point and on, the device "/dev/st0" behaved busy
    and even the "shutdown" didn't worked - apparently
    the system waited until everything had been properly closed
    while this device remained opened so I finally had to brutally
    power down the system. Reading about SCSI tape device names
    I saw that there are few names for the same tape:

    /dev/st0 for mode 0
    /dev/st0l for mode 1
    /dev/st0m for mode 2
    /dev/st0a for mode 3

    Did I used the correct device name for multi-volume backup with tar?
    What is the difference between different modes of accessing the SCSI tape?
    Any ideas as to what causes the error message?

  2. kaza

    kaza New Member

    Anyone has/had such problem?
  3. falko

    falko Super Moderator ISPConfig Developer

    Unfortunately I have no experience with tape drives... :(

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