I/O error while running backup stgpool process with TSM 5.2.2.2

My environment is the following
-TSM Server v5.2.2.2 on HP BladesBL20p machine with Windows 2000 Server.
-TSM Clients v.5.2.0.6 on windows machines, TSM Clients v.5.2.2.0 on
Linux RH 2.1 machines and TSM STA 5.2.2.2 on Linux RH 2.1 and Windows
machines
-MSL6030 2 Ultrium 460 Drives with FC Router
-Fabric switches: two SAN switch 2/8 el

I get too many read errors while doing a backup stgpool or reclamation
processes but I don't get any errors doing LAN Free backups or migration
processes. The followings messages appear in the activity log:
02/18/2004 07:37:47   ANR8302E I/O error on drive DRV2 (mt1.2.0.4)
(OP=READ,Error Number=1117, CC=416, KEY=20, ASC=00, ASCQ=00,
SENSE=F0.00.20.00.00.1E.14.0E.00.00.00.00.00.00.00.00.2C.73.00.00.00.00.,
Description=An incorrect length block was read).  Refer to Appendix D in the
'Messages' manual for recommended action. (SESSION: 1840,PROCESS: 86)

02/18/2004 07:39:55   ANR8302E I/O error on drive DRV2 (mt1.2.0.4)
(OP=READ,Error Number=1117, CC=416, KEY=FF, ASC=FF, ASCQ=FF, SENSE=**NONE**,
Description=An incorrect length block was read).  Refer to Appendix D in the
'Messages' manual for recommended action.
(SESSION: 1840, PROCESS: 86)

02/18/2004 07:39:55   ANR1417W Access mode for volume DM5477L2 now set to
"read-only" due to excessive read error. (SESSION: 1840, PROCESS: 86)

Sometimes when I run the process for a second time, everything works fine. I
have the same problem with several cartridges.

Any help will be appreciated!!!. Thanks

Henry Aranda

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