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Full Discussion: Tape device temporarily unavailable
Operating Systems AIX Tape device temporarily unavailable Post 302555159 by petervg on Wednesday 14th of September 2011 04:21:15 AM
Old 09-14-2011
Tape device temporarily unavailable
Hi All,

After (by accident) closing a session that ran a restore command I can not access the tape drive anymore.

I get the following error:
Code:
# tctl -f /dev/rmt0 rewind
/dev/rmt0: Resource temporarily unavailable

But I cannot find any processes associated with the tape device:
Code:
# ps -ef | egrep "restore|rmt"
    root 4595872 4321502   0 09:59:54 pts/71  0:00 egrep restore|rmt
# fuser /dev/rmt0
/dev/rmt0:

Although AIX says that the device is available:
Code:
# lsdev -Cc tape
rmt0 Available 06-08-01-0,0 LVD SCSI 4mm Tape Drive

I cannot remove the device and then add it:
Code:
# rmdev -dl rmt0
Method error (/etc/methods/ucfgdevice):
        0514-062 Cannot perform the requested function because the
                 specified device is busy.

Still I can access the attributes of the device:
Code:
# lsattr -El rmt0
block_size    1024  BLOCK size (0=variable length)       True
compress      yes   Use data COMPRESSION                 True
density_set_1 71    DENSITY setting #1                   True
density_set_2 38    DENSITY setting #2                   True
extfm         yes   Use EXTENDED file marks              True
mode          yes   Use DEVICE BUFFERS during writes     True
ret           no    RETENSION on tape change or reset    True
ret_error     no    RETURN error on tape change or reset True
size_in_mb    36000 Size in Megabytes                    False

Which procedure should I follow to get access to the tape device again?
 

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LEARN ABOUT REDHAT

tapeinfo

TAPEINFO(1)						      General Commands Manual						       TAPEINFO(1)

NAME

       tapeinfo - report SCSI tape device info

SYNOPSIS

       tapeinfo -f <scsi-generic-device>

DESCRIPTION

       The  tapeinfo  command  reads  various information from SCSI tape drives that is not generally available via most vendors' tape drivers. It
       issues raw commands directly to the tape drive, using either the  operating  system's  SCSI  generic  device  (	e.g.  /dev/sg0	on  Linux,
       /dev/pass0 on FreeBSD) or the raw SCSI I/O ioctl on a tape device on some operating systems.

       One  good  time	to  use 'tapeinfo' is immediately after a tape i/o operation has failed. On tape drives that support HP's 'tapealert' API,
       'tapeinfo' will report a more exact description of what went wrong.

       Do be aware that 'tapeinfo' is not a substitute for your operating system's own 'mt' or similar tape driver control program. It is intended
       to supplement, not replace, programs like 'mt' that access your operating system's tape driver in order to report or set information.

OPTIONS

       The first argument, given following -f , is the SCSI generic device corresponding to your tape drive.  Consult your operating system's doc-
       umentation for more information (for example, under Linux these are generally start at /dev/sg0 under FreeBSD these start at /dev/pass0).

       Under FreeBSD, 'camcontrol devlist' will tell you what SCSI devices you have, along with which 'pass' device controls  them.  Under  Linux,
       "cat /proc/scsi/scsi" will tell you what SCSI devices you have.

BUGS AND LIMITATIONS

       This program has only been tested on Linux with a limited number of tape drives (HP DDS4, Seagate AIT).

AVAILABILITY

       tapeinfo  is  currently being maintained by Eric Lee Green <eric@badtux.org> formerly of Enhanced Software Technologies Inc. The 'mtx' home
       page is http://mtx.sourceforge.net and the actual code is currently available there and via CVS from http://sourceforge.net/projects/mtx/ .

SEE ALSO

       mt(1),mtx(1),scsitape(1)

								    TAPEINFO1.0 						       TAPEINFO(1)
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