CHOOSING THE NUMBER OF PLACEMENT GROUPS

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Hi all:

     I have a tiny question. I have read the documents, and it
recommend approximately 100 placement groups for normal usage.
Because the pg num can not be decreased, so if in current cluster,
the pg num have met this rule, and when I try to create a new pool ,
what pg num I should set ? I think no matter what I do , it  will
violate the pg-num-rule, add burden to osd.  This means , if I want my
 cluster be used by many different users, I should bulid a new cluster
for new user ?
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