LTO1 tapes

[castgroup02]

Hi there,

Can anyone plesae explain why on LTO tapes with the same size 100-200GB when Full netbackup shows different sizes,
e.g.

Media_id Size Status

000045 252914871 FULL/MPX
000091 364378557 FULL/MPX
000118 263259207 FULL/MPX
000163 287711152 FULL/MPX
000197 348104953 FULL/MPX



I was expecting to see Full Lto1 tapes showing exact same size.
Note these media id belong to same volume pool, same retention period, etc.

Please advise.

Thanks

 

[Stumpr]

This is normal. It is because hardware compression changes according to the data structure.

Bob Stump
Just because the VERITAS documentation states a certain thing does not make it a fact and that is truth.

 

[comtec17]

Bob is correct. Compression ratios will change dependent upon file types and sizes.

Also note, there are times where you will not see even 100GB on a tape due to a reverse compression of some files.

 

[castgroup02]

Ok, thanks guys.