Fullness of Ultrium2 tapes

[brackovic]

Customer has Ultirum2 drives and uses 200/400 GB tapes.
In the NW configuration he has several file system backup groups of clients and one group for Oracle backup.

Version of NW is 7.1.6 and version of NMO is 4.0.

Tapes from Oracle pool have average fullness of about 320 GB, while tapes from file systems’ pools have average fullness of about 115 GB.

We tried a few things:
- We have increased number of streams to tape, so all created savesets from clients in one file system group can be written at same time on the tape.
- We have included and excluded and again included standard directive with compression.

The result was the same: file system tape has been fulfilled up to 120 GB maximum, while Oracle tapes have been fulfilled normally up to 350 GB.

Does someone have some explanation and suggestion for this issue??

S

 

[605]

Databases are usually much more compressible than other data.

 

[Martin999]

If there is an error during backup and it is aborted the tape can be marked full. If you run a
mminfo -a -q volume=volumename -r ssflags and look for an 'i' that shows that there was an incomplete backup/saveset. Only 115GB for the tape to be full may suggest an issue.