2018-03-09 10:27 GMT+01:00 Will Zhao <zhao6...@gmail.com>: > Hi all: > > I have a tiny question. I have read the documents, and it > recommend approximately 100 placement groups for normal usage. >
Per OSD. Approximately 100 PGs per OSD, when all used pools are summed up. For things like radosgw, let it use the low defaults (8?) and then expand on the pools that actually see a lot of data getting into them, leave the rest as is. > 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 ? > > No, one cluster can serve a lot of clients. You can have lots of pools if you need, and those pools can have separate OSD hosts serving them if you need strong separation, but still managed from the same cluster. -- May the most significant bit of your life be positive.
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