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# OSD的pg\_num與CephFS

* 少於5個OSD將pg\_num設置為128
* 在5至10個OSD之間，將pg\_num設置為512
* Between 10 and 20 OSDs set pg\_num to 1024 
* Between 20 and 40 OSDs set pg\_num to 2048
* 如果您有超過50個OSD，則需要了解折衷方法以及如何自己計算pg\_num值

### ceph osd pool set ceph pg\_num 4096

ceph osd pool set ceph pg\_num 4096 Error ERANGE: pool id 10 pg\_num 4096 size 2 would mean 8192 total pgs, which exceeds max 5250 (mon\_max\_pg\_per\_osd 250 \* num\_in\_osds 21)


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