Move data from tape requires another tape

Anna

ADSM.ORG Member
Joined
Jul 18, 2016
Messages
10
Reaction score
0
Points
0
PREDATAR Control23

Hello,

last few weeks i experienced randomly this issue.

When I tryd to move data from tape, system sometimes tells me the process needs some another tape to do so, but I have only two drives, so move data is not even started, cause system waits for third tape to mount.
In LTO5 stg pool are only file and SQL backups and has no copypool. Largest SQL database is 1,4TB.
(exmaple below: tape GQ6916 has 2,3TB and 000197 2,7TB capacity)

ANR2017I Administrator XXXX issued command: MOVE DATA
GQ6916 stg=lto5 (SESSION: 26048)
ANR1157I Removable volume 000197 is required for move
process. (SESSION: 26048)
ANR1157I Removable volume GQ6916 is required for move
process. (SESSION: 26048)
ANR0984I Process 498 for MOVE DATA started in the
BACKGROUND at 10:25:41. (SESSION: 26048, PROCESS: 498)
ANR1140I Move data process started for volume GQ6916
(process ID 498). (SESSION: 26048, PROCESS: 498)
ANR8337I LTO volume GQ6918 mounted in drive DRIVE1
(mt4.0.0.1). (SESSION: 26048, PROCESS: 498)
ANR1340I Scratch volume GQ6918 is now defined in storage
pool LTO5. (SESSION: 26048, PROCESS: 498)
ANR0513I Process 498 opened output volume GQ6918.
(SESSION: 26048, PROCESS: 498)
ANR8337I LTO volume 000197 mounted in drive DRIVE0
(mt3.0.0.1). (SESSION: 26048, PROCESS: 498)
ANR0512I Process 498 opened input volume 000197.
(SESSION: 26048, PROCESS: 498)
upload_2017-3-1_10-55-55.png
Process stays like this and does nothing.

Yesterday I tryed to move data from tape to diskpool, process started, wrote require two different tapes, moved just 15% from tape and than declared process to be successfully completed.
Restarting move process just instantly ends as successfull.
(both tapes are in library presented and readable)

I will be really thankful for any advice.

Anna
 
PREDATAR Control23

When I tryd to move data from tape, system sometimes tells me the process needs some another tape to do so, but I have only two drives, so move data is not even started, cause system waits for third tape to mount.
It's probably because an object spans across those 2 tapes, but it would still only use 2 tape mounts. It would process the first tape first, then the second after. Reading from tape and writing to tape is done sequentially, so only two drives are needed. One to read the data to be moved, and another to write the data to another tape.

Yesterday I tryed to move data from tape to diskpool, process started, wrote require two different tapes, moved just 15% from tape and than declared process to be successfully completed.
Restarting move process just instantly ends as successfull.
Is the tape you specified in the move data command empty now? (Q VOL, Q CONTENT)
 
PREDATAR Control23

Thanks for fast answer.

1 - I let the move process live for few hours, nothing happend. One tape shows only two SQL databases as content, second tape shows files not related to those databases, but there are so many of them, it can hide something related to those SQL databases.
2 - looked into act log and find out move process successfully ended at 15:47 (moved 15%) but at 17:20 tape was mounted again and move process continued until 21:30, tape appears as scratch now. Nothing important (just status monitor) recorded in act log between 15:47 and 17:20. I guess I will never understand TSM internal processes...

Really appriciate your help.

Anna
 
PREDATAR Control23

Well, with only two tape drives, the move data could have been waiting for other processes and/or sessions to free up tape drives.
 
Top