[gpfsug-discuss] Problem using group pool for migration

[Marc A Kaplan]

Richard Powell, 
  Good that you have it down to a smallish test case.  Let's see it!
Here's my test case. Notice I use -L 2 and -I test to see what's what:

[root@/main/gpfs-git]$mmapplypolicy c41 -P /gh/c41gp.policy -L 2  -I test
[I] GPFS Current Data Pool Utilization in KB and %
Pool_Name                   KB_Occupied        KB_Total  Percent_Occupied
cool                              66048         9436160      0.699945741%
system                          1190656         8388608     14.193725586%
xtra                              66048         8388608      0.787353516%
[I] 4045 of 65792 inodes used: 6.148164%.
[I] Loaded policy rules from /gh/c41gp.policy.
Evaluating policy rules with CURRENT_TIMESTAMP = 2018-08-23 at 14:11:26 UTC
Parsed 2 policy rules.
rule 'gp' group pool 'gp' is 'system' limit(3) then 'cool' limit(4) then 
'xtra'
rule 'mig' migrate from pool 'gp' to pool 'gp' weight(rand())
[I] 2018-08-23 at 14:11:26.367 Directory entries scanned: 8.
[I] Directories scan: 7 files, 1 directories, 0 other objects, 0 'skipped' 
files and/or errors.
[I] 2018-08-23 at 14:11:26.371 Sorting 8 file list records.
[I] 2018-08-23 at 14:11:26.416 Policy evaluation. 8 files scanned.
[I] 2018-08-23 at 14:11:26.421 Sorting 7 candidate file list records.
WEIGHT(0.911647) MIGRATE /c41/100e TO POOL gp/cool SHOW()
WEIGHT(0.840188) MIGRATE /c41/100a TO POOL gp/cool SHOW()
WEIGHT(0.798440) MIGRATE /c41/100d TO POOL gp/cool SHOW()
WEIGHT(0.783099) MIGRATE /c41/100c TO POOL gp/xtra SHOW()
WEIGHT(0.394383) MIGRATE /c41/100b TO POOL gp/xtra SHOW()
WEIGHT(0.335223) MIGRATE /c41/100g TO POOL gp/xtra SHOW()
WEIGHT(0.197551) MIGRATE /c41/100f TO POOL gp/xtra SHOW()
[I] 2018-08-23 at 14:11:26.430 Choosing candidate files. 7 records scanned.
[I] Summary of Rule Applicability and File Choices:
 Rule#      Hit_Cnt          KB_Hit          Chosen       KB_Chosen  
KB_Ill     Rule
     0            7          716800               7          716800  0 
RULE 'mig' MIGRATE FROM POOL 'gp' WEIGHT(.) \
TO POOL 'gp'

[I] Filesystem objects with no applicable rules: 1.

[I] GPFS Policy Decisions and File Choice Totals:
 Chose to migrate 716800KB: 7 of 7 candidates;
[I] File Migrations within Group Pools
      Group           Pool        Files_Out          KB_Out Files_In  
KB_In
         gp         system                7          716800 0  0
         gp           cool                0               0 3 307200
         gp           xtra                0               0 4 409600
Predicted Data Pool Utilization in KB and %:
Pool_Name                   KB_Occupied        KB_Total  Percent_Occupied
cool                             373248         9436160      3.955507325%
system                           473856         8388608      5.648803711%
xtra                             475648         8388608      5.670166016%




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