This Error after Reboot -> ioctl (MTWEOF) failed on media

Hi.

After a SAN Network breakdown and reboot of the Netbackup servers i get this error messages

19.03.2009 17:34:23 - begin Duplicate
19.03.2009 17:34:24 - requesting resource DSSU-Media02-SDLT600-local
19.03.2009 17:34:26 - granted resource 050452
19.03.2009 17:34:26 - granted resource Drive007
19.03.2009 17:34:26 - granted resource DSSU-Media02-SDLT600-local
19.03.2009 17:34:33 - started process bptm (pid=2937)
19.03.2009 17:34:58 - started process bpdm (pid=3010)
19.03.2009 17:35:00 - begin reading
19.03.2009 17:35:01 - started process bptm (pid=2937)
19.03.2009 17:35:01 - mounting 050452
19.03.2009 17:40:11 - Error bptm (pid=2937) ioctl (MTWEOF) failed on media id 050452, drive index 7, I/O error (bptm.c.20607)
19.03.2009 17:40:11 - Error bptm (pid=2937) FROZE media id 050452, could not write tape mark to begin new image
19.03.2009 17:40:11 - current media 050452 complete, requesting next media Any
19.03.2009 17:41:22 - started process bptm (pid=2937)
19.03.2009 17:41:22 - mounting 050559
19.03.2009 17:41:20 - granted resource 050559
19.03.2009 17:41:20 - granted resource Drive009
19.03.2009 17:41:20 - granted resource DSSU-Media02-SDLT600-local
 

I have this problem only with my SDLT600 drives. The LTO/3 still work!

Please help me...