This seems to be your problem Bill:

APAR= IC27477
ISSUING THE UPDATE DRIVE COMMAND WITHOUT SPECIFYING THE DEVICE NAME IN THE
COMMAND COULD CAUSE 3494 TO LOSE DRIVE INFORMATION

Status: CLOSED                              Closed: 07/25/00

Error Description:
Issuing the UPDATE DRIVE command without specifying the device name in the
command, could cause the 3494 library manager to lose the information for
this drive.  As a result, any subsequent attempts by the TSM Server to
access this drive may fail with the following errors:
.

   ANR8301E I/O error on library 3494 (OP=005C6D37,  SENSE=N/A,
CC=00000023).
   ANR8848W Drive DRIVE1 of library 3494 is inaccessible; server has begun
polling drive.
.
The 3494 library manager assigns a device number to each drive and issuing
the UPDATE DRIVE command without specifying the device name for that drive
(i.e. device=/dev/rmt1) may cause the the existing device number assigned to
that drive by the 3494 to be modified or deleted.  The completion code of 23
in the error message above indicates that the device does not exist in the
library.  In order to recover from this condition the user must delete and
redefine the drive to TSM, or recycle the TSM Server.
.
This problem exists in the 3.1.x and 3.7.x Server code, but only affects
drives in a 3494 library.

Local Fix:
Include the device parameter when issuing the UPDATE DRIVE
command.
   Correct syntax:

      UPDATE DRIVE 3494LIB DRIVE1 device=/dev/rmt1 ONLINE=YES
   Incorrect syntax:
      UPDATE DRIVE 3494LIB DRIVE1 ONLINE=YES


Problem Summary:
****************************************************************
* USERS AFFECTED:                                              *
ADSM 3.1.2.X and TSM 3.7X customers on the AIX, HP, SUN and
NT platforms using 3494 libraries.
****************************************************************
* PROBLEM DESCRIPTION:                                         *
After an UPDATE DRIVE command without the DEVICE parameter,
the TSM server looses the device number for the given drive.
The TSM server needs that device number to specify the

drive when communicating to the 3494 Library Manager.

The TSM server may abend when attempting to communicate to the
3494 Library Manager to perform a mount/demount activity or to
obtain information about the given drive.  Otherwise, there
may be I/O errors in the activity log; that is, ANR8301E
messages with a completion code of 0x023.
****************************************************************
* RECOMMENDATION:                                              *
Apply PTF when available.
****************************************************************
The TSM server maintains the correct device number for
the given drive after an UPDATE DRIVE command whether
or not the DEVICE parameter was specified.

Temporary Fix:
Until the fix is available:
1) Include the DEVICE parameter in the UPDATE DRIVE command.
2) Delete and then re-define the drive to TSM.


Comments:
MODULES/MACROS:   NONE

Problem Conclusion:
None.