[gpfsug-discuss] Policy scan against billion files for ILM/HSM

[Marc A Kaplan]

>>>Here is the command I use to apply a policy:

 mmapplypolicy gsfs0 -P policy.txt -N 
 scg-gs0,scg-gs1,scg-gs2,scg-gs3,scg-gs4,scg-gs5,scg-gs6,scg-gs7 -g 
 /srv/gsfs0/admin_stuff/ -I test -B 500 -A 61 -a 4

 That takes approximately 10 minutes to do the whole scan.  The "-B 500 
 -A 61 -a 4" numbers we determined just by trying different values with 
 the same policy file and seeing the resulting scan duration.
<<<

That's pretty good.  BUT, FYI, the -A number-of-buckets parameter should 
be scaled with the total number of files you expect to find in the 
argument filesystem or directory. 

If you don't set it the command will default to number-of-inodes-allocated 
/ million, but capped at a minimum of 7 and a maximum of 4096. 



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