We use TSM 3.7.3.8 @MVS with several 3590-tapes shared with OS390.

Our biggest files are 30GB (Exchange) and normally went direct to tape 
by setting a sizelimit to the diskstorage pool.

What happened last week was an incredible short backuptime of the exchange
node 
without any error. Looking through the dsmsched.log I found :  

        06/21/2001 02:33:46 ANS1312E Server media mount not possible   
                (due to no tape free at this moment?)

The TSM Client skipped the file and finished with the following summary:

06/21/2001 02:33:46 --- SCHEDULEREC STATUS BEGIN
06/21/2001 02:33:46 Total number of objects inspected:    8,565
06/21/2001 02:33:46 Total number of objects backed up:      246
06/21/2001 02:33:46 Total number of objects updated:          0
06/21/2001 02:33:46 Total number of objects rebound:          0
06/21/2001 02:33:46 Total number of objects deleted:          0
06/21/2001 02:33:46 Total number of objects expired:         26
06/21/2001 02:33:46 Total number of objects failed:           0
06/21/2001 02:33:46 Total number of bytes transferred:   138.73 MB
06/21/2001 02:33:46 Data transfer time:                   74.62 sec
06/21/2001 02:33:46 Network data transfer rate:        1,903.68 KB/sec
06/21/2001 02:33:46 Aggregate data transfer rate:      1,067.74 KB/sec
06/21/2001 02:33:46 Objects compressed by:                    0%
06/21/2001 02:33:46 Elapsed processing time:           00:02:13
06/21/2001 02:33:46 --- SCHEDULEREC STATUS END

The eventlog shows no exception for this schedule.

IBM's comment: "Works as designed"

Now I consider to do the backup of large files to the primary storagepool on
disk, because its very difficult to detect this error. (error.log shows no
errors)

With Regards, Stefan Holzwarth

> -----Ursprüngliche Nachricht-----
> Von: Sam Schrage [mailto:sam.schrage AT TRW DOT COM]
> Gesendet am: Donnerstag, 21. Juni 2001 20:15
> An: ADSM-L AT VM.MARIST DOT EDU
> Betreff: Disk pool size vs large file
> 
> I have a 56GB disk pool with the next pool to tape.  I have a 
> user, DB2
> Admin, that wants to back up a 125GB DB2 backup.  What's the 
> best way to
> handle this one user?  If he/she backs up the file will it 
> crash the system
> because it's bigger that the diskpool, or will it go right to tape?
> 
> Sam Schrage
> TRW Systems
> sam.schrage AT trw DOT com
>