I have a perplexing problem I am hoping some one can help with.
HP Ultrium 4-SCSI external tape drive
Quantum Ultrium LTO 4 800/1600 tape media
Symantec Backup Exec 2010 R3 SP2
VMWare 4.1 Guest
Window Server 2008 Ent R2
We have a primary set of 10 tapes all purchased at the same time. Within that set, they are broken up into 5 sets of 2 for rotation and each set is used one week then rotated. Within that set of 10, 3 of the tapes are reporting higher soft read and/or write errors than the other tapes. Those tapes that are reporting those higher numbers are also show greater used capacity than data, which is a red flag as that can not be. For example, showing data on tape 23-C Backup Exec shows the data on tape as 233.48 GB but it also shows used capacity as 387.9 of 780.5 which is wrong. This leads to failed jobs as the tape fills up, but the actual data is not that high.
I have tried doing both short and long erases and no change.
The last time this happened, I restarted the ESX host and the guest and then the tapes worked correctly. I did that today but no change.
Any one have any ideas? I mean sure, I could just flag those tapes as bad but I am talking about a total of 4 tapes here which seems more that just a tape problem.