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My Library or drive is not seen by BRU Server During the Hardware Scan, why not?

Views: 13421
Votes: 2
Posted: 06 Nov, 2007
If you are running a Red Hat based distribution, the provided kernel does not scan SCSI LUN 's during boot. Please note that this is NOT a BRU Server problem, but rather an issue in the fact that Red Hat doesn't seem to have much concern for their customers using Tape devices. To resolve this, you must enable LUN support. This can be achieved by either of two mechanisms:
  • Rebuild your kernel setting "Scan all LUNS" to yes in the config file
  • Dynamically insert and remove SCSI devices

If a newer kernel and the /proc file system is running, a non-busy device can be removed and installed 'on the fly'.

  • To add a SCSI device: echo "scsi add-single-device a b c d" > /proc/scsi/scsi
  • To remove a SCSI device: echo "scsi remove-single-device a b c d" > /proc/scsi/scsi

    a == hostadapter id (first one being 0)
    b == SCSI channel on hostadapter (first one being 0)
    c == ID
    d == LUN (first one being 0)

  • For example, to add a tape drive at LUN 1 on ID 6 on your first SCSI bus, you could use:

    echo "scsi add-single-device 0 0 6 1" > /proc/scsi/scsi

    If you now re-run BRU Server 's hardware scan , the missing device will be found.

    For more information, please refer to the Linux SCSI Programming How-To.

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