Understanding Query OCCupancy on HSM filesystem

avv

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PREDATAR Control23

Hi,

I have the following HSM FS, which migrates data from 20TB GPFS to lto5 tapes:


tsm: tsm-srv-a>q filesp hsm-node-a /gpfs/hsm-1

Node Name: hsm-node-a
Filespace Name: /gpfs/hsm-1
FSID: 14
Platform: Linux x86-64
Filespace Type: GPFS
Is Filespace Unicode?: No
Capacity: 20,479 GB
Pct Util: 48.9

tsm: tsm-srv-a>q occ hsm-node-a /gpfs/hsm-1

Node Name: hsm-node-a
Type: Bkup
Filespace Name: /gpfs/hsm-1
FSID: 14
Storage Pool Name: BCK-1
Number of Files: 3,183,589
Physical Space Occupied (MB): 21,560,257.28
Logical Space Occupied (MB): 21,545,729.28

Node Name: hsm-node-a
Type: Bkup
Filespace Name: /gpfs/hsm-1
FSID: 14
Storage Pool Name: BCK-1-COPY
Number of Files: 3,183,587
Physical Space Occupied (MB): 21,556,129.28
Logical Space Occupied (MB): 21,539,937.28

Node Name: hsm-node-a
Type: SpMg
Filespace Name: /gpfs/hsm-1
FSID: 14
Storage Pool Name: HSM-1
Number of Files: 1,293,109
Physical Space Occupied (MB): 12,474,465.28
Logical Space Occupied (MB): 12,474,465.28

Node Name: hsm-node-a
Type: SpMg
Filespace Name: /gpfs/hsm-1
FSID: 14
Storage Pool Name: HSM-1-COPY
Number of Files: 1,293,109
Physical Space Occupied (MB): 12,474,465.28
Logical Space Occupied (MB): 12,474,465.28



Due to a failure of disk array I'm restoring (dsmc restore) contents of this FS to a different disk array.
New FS is *not* HSM-managed - it's just a regular filesystem on another linux box.

I have already restored about 80TB of files and restore is still going.

This value does not correspond with above output of "q occ" command - Physical/Logical Space Occupied is much smaller that 80TB.

Can you comment on this?

Thanks in advance!
 
PREDATAR Control23

In HSM, similar files have been marked by a stub file and does not get backed up.

Restoring in non-HSM will required similar files to be restored according to the storage location and thus will run longer and restore more files, most of which are similar ones.
 
PREDATAR Control23

@moon-buddy,

can you elaborate?

Do you mean that many files can be assigned to a single stub file?

What do you mean by "does not get backed up" ?

Is there any way to get reliable information how many files and TBs are in fact in backup storage pool for that FS ?

Thanks in advance.
 
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