Tape usage
- 13 years ago
Just looking at your figures ...
15314.463 GB in one week = 15TB = 10 native LTO5 tapes > + allowance for different retention periods and using additional tapes which you were using 4 drives so possibly to an extra 8 tapes per week = 10 + 8 = 18 tapes in 1 week
You say in an early comment "Anther thing we had 23 LTO5 tapes this week, for 2 weeks. Normally under our old setup (NetBackup 5.6) we had about 8 LTO3 tapes a week. "
From your figures it would use 36 tapes at native rates for 2 weeks - this means that they are both full and compressed (apart from the 8 part used tapes caused by 4 drives and 2 retention periods)
Your old system used to use 8 x LTO3 tapes .... well at 2:1 compression (so 800GB per tape) 15TB would need to use 19 x LTO3 tapes.
I think what you are seeing is actually about right - using less drives will save on tape use but your data must have grown
Hope this helps - you are actually doing about right!