Tape drive usage can be based on your storage unit. If you have 10 tape drives but you have 2 storage units with 4 drives each That means at the most you will only use 8 drives.
So it could be that the storage units you are using are not set up to utilize all the drives. As to the fact that 2 different ones are avail. Netbackup tries to use the tape drives in a round robin kind of way so that each tape drives gets used. Trying to even out the usage. So first round of 8 drives would use drives 1 - 8 but the second round might use 3 - 10. Look at the number of drives in your storage units and see if you can increase them any to use all 10 drives. -----Original Message----- From: veritas-bu-boun...@mailman.eng.auburn.edu [mailto:veritas-bu-boun...@mailman.eng.auburn.edu] On Behalf Of mcw012765 Sent: Monday, March 16, 2009 6:33 AM To: VERITAS-BU@mailman.eng.auburn.edu Subject: [Veritas-bu] Not all drives appear to be used I am a Netbackup 6.5.2A user. I currently have 100+ clients that I back up on a daily basis (fulls and cumulative incrementals). I have a Sun/STK SL3000 tape library with 10 LTO-4 tape drives. My issue is with tape drive usage. I have multiplexing and multistreaming turned on for all of my policies. It appears that only 8 of the 10 drives are in use at a time. Also, it is not always the same 2 drives not in use. Any ideas on why this is? As I write this, I have several jobs queued saying that "required drives are in use", but there are 2 tape drives available. +---------------------------------------------------------------------- |This was sent by mwea...@fbinsmi.com via Backup Central. |Forward SPAM to ab...@backupcentral.com. +---------------------------------------------------------------------- _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu _______________________________________________ Veritas-bu maillist - Veritas-bu@mailman.eng.auburn.edu http://mailman.eng.auburn.edu/mailman/listinfo/veritas-bu
