Many thanks for the reply from Doug, Ben and Daniel.

I tried Ben's suggestion but still getting the same error.  Grateful for
any further advice.  Following is the ADSM definitions and log.

Regards,
Chin

==================================================
adsm> q drive

Library Name     Drive Name       Device Type     Device
Element
------------     ------------     -----------     ----------------
-------
-------
LIB_3590_1       DRV_3590_3       3590            /dev/rmt0
LIB_3590_1       DRV_3590_3       3590            /dev/rmt0
   16
LIB_3590_2       DRV_3590_2       3590            /dev/rmt1
   16
LIB_3590_3       DRV_3590_3       3590            /dev/rmt2
   16

======================================================
adsm> q drive f=d

          Library Name: LIB_3590_1
                    Drive Name: DRV_3590_3
                   Device Type: 3590
                        Device: /dev/rmt0
                       Element: 16
Last Update by (administrator): SYSADM
         Last Update Date/Time: 09/10/98 12:27:59

                  Library Name: LIB_3590_2
                    Drive Name: DRV_3590_2
                   Device Type: 3590
                        Device: /dev/rmt1
                       Element: 16
Last Update by (administrator): SYSADM
         Last Update Date/Time: 02/09/97 01:02:38

                  Library Name: LIB_3590_3
                    Drive Name: DRV_3590_3
                   Device Type: 3590
                        Device: /dev/rmt2
                       Element: 16
Last Update by (administrator): SYSADM
         Last Update Date/Time: 09/08/98 16:47:29

======================================================
adsm> q devclass

Device       Device        Storage    Device       Format     Est/Max
Mount
Class        Access           Pool    Type
Capacity    Limit
Name         Strategy        Count
(MB)
---------        ----------             -------    ---------
------       --------         -----
------       --------         -----
DEVC_359-    Sequential          6    3590         3590C     30,720.0
DEVC_359-    Sequential          6    3590         3590C     30,720.0
    2
 0_1
DEVC_359-    Sequential          5    3590         3590C     30,720.0
    1
 0_2
DEVC_BAC-    Sequential          0    FILE                    1,800.0
    1
 KUPDB
DISK         Random              0

========================================================
09/29/98 13:10:11    ANR0403I Session 3153 ended for node KLLLL13 (AIX).
09/29/98 13:10:11    ANR0403I Session 3150 ended for node KLLLL12 (AIX).
09/29/98 13:10:12    ANR0400I Session 3154 started for node KLLLL13
(AIX).
09/29/98 13:10:12    ANR0400I Session 3155 started for node KLLLL12
(AIX).
09/29/98 13:10:15    ANR0403I Session 3155 ended for node KLLLL12 (AIX).
09/29/98 13:10:16    ANR0400I Session 3156 started for node KLLLL12
(AIX).
09/29/98 13:10:24    ANR8447E No drives are currently available in
library
                      LIB_3590_1.
09/29/98 13:10:24    ANR1401W Mount request denied for volume P00031 -
mount
                      failed.
09/29/98 13:10:24    ANR0525W Transaction failed for session 3154 for
node
                      KLLLL13 (AIX) - storage media inaccessible.
09/29/98 13:10:25    ANR0403I Session 3154 ended for node KLLLL13 (AIX).
09/29/98 13:10:52    ANR0400I Session 3157 started for node KLLLL12
(AIX).
=========================================================
>----------
>From:  bbullock[SMTP:bbullock AT MICRON DOT COM]
>Sent:  14 October 1998 00:17
>To:    ADSM-L AT VM.MARIST DOT EDU
>Subject:       Re: Defining two 3590s to a storage pool
>
>I'm not sure about what you are trying to accomplish here. Did new library
>definition , with it's own unique scratch and private categories? or did you
>add your new drive into the current library and now you want it to be
>utilized?
>  If it is the latter, you want to make sure that you updated the device so
>that it's "mount limit" reflects that you have one more drive. You can see
>this by using the "query dev" command and then a command like "update dev
>3590 mountl=2" if it needs to be upped.
>
>Ben
>
>        -----Original Message-----
>        From:   Chin, Anthony SAIS-ASCI
>[SMTP:anthony.k.k.chin AT SSI.SHELL.COM DOT MY]
>        Sent:   Monday, October 12, 1998 6:09 PM
>        To:     ADSM-L AT VM.MARIST DOT EDU
>        Subject:        Defining two 3590s to a storage pool
>
>        >I have installed another 3590 and would like to use it as a second
>library of
>        >a storage pool so that I can have two concurrent backup sessions.
>However,
>        when the 2nd session was started (while the first dirve was still
>being
>        >used by the first session), ADSM did not use the second
>drive/library and
>        >displayed message :
>        >
>        >"ANR8447E No Drive are currently available in the library"
>        >
>        >How do I resolve this problem ? Grateful for any advice.  I am
>using ADSM
>        >version 2.1.
>        >
>        >Regards,
>        >Chin
>        >
>