Tape Library not Accessible
Symptom
During startup of the MAS, the following message displays
for each virtual tape drive:
MAS156W: Tape E880 Data path /tapelib/ is not accessible!
If this message is ignored, every subsequent tape mount will
fail, with the following message displayed each time:
MAS400E: Tape E880 Data path /tapelib/ is not accessible
Resolution
The most probable cause is that no accessible, external
filesystem is mounted on the directory /tapelib. Enter a Query Space command
on the MAS console:
q space
Devicename UA Size Used Avail Use% Filesystem Path
---------- -- ---- ---- ----- ---- ---------- ----
E880 80 16G 1.5G 13G 10% /dev/md0 /tapelib/
E881 81 16G 1.5G 13G 10% /dev/md0 /tapelib/
Note that the /tapelib path is mounted on /dev/md0, the
root drive. Normally, /tapelib should be mounted on an external fibre-channel,
SCSI, or network attached drive. To protect from accidentally writing tape
volumes to the root drive if no data drive is mounted to /tapelib, the /tapelib
directory on the MAS root drive is owned by root and is deliberately protected
from all read and write access. You can also verify that this is the current
situation by using the ls command. Open a terminal session and enter the following
command:
ls -alid /tapelib
d--------- 2 root root 4096 Jun 13 17:45
If the result looks like the one shown, where /tapelib is
owned by root and has no read or write permissionsm this indicates that
no external filesystem has been mounted on /tapelib.
One other way to verify this is to do a mount command to
show what filesystems are currently mounted:
mount
/dev/md0 on / type ext2 (rw)
none on /proc type proc (rw)
/dev/md1 on /boot type ext2 (rw)
Note that /tapelib doesn't show in this list - it isn't
mounted anywhere.
To correct this problem, mount the proper external filesystem
on the /tapelib directory. To automatically mount the filesystem each time
the MAS is restarted, you must also update the /etc/fstab. The MAS Users Guide
describes in detail how to define and mount the tape library and update the
/etc/fstab.
When the tape library is correctly mounted on an external
disk filesystem, the MAS should see it like this (note filesystem name:
/dev/sdc1 is the third SCSI drive):
q space
Devicename UA Size Used Avail Use% Filesystem Path
---------- -- ---- ---- ----- ---- ---------- ----
E880 80 84G 792k 79G 1% /dev/sdc1 /tapelib/
E881 81 84G 792k 79G 1% /dev/sdc1 /tapelib/
The ls and mount commands should show that /tapelib is mounted
on the external filesystem. The owner of /tapelib should always be vtape,
the user name under which the MAS application runs, and there should be
read and write permission:
ls
drwxr-xr-x 3 vtape vtape 4096 Jul 17 11:15 /tapelib
mount
/dev/md0 on / type ext2 (rw)
none on /proc type proc (rw)
/dev/md1 on /boot type ext2 (rw)
/dev/sdc1 on /tapelib type ext2 (rw)
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Copyright © 2005 by Bus-Tech, Inc.
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