之前测试用ceph总是警告
health HEALTH_WARN
pool cephfs_metadata2 has many more objects per pg than average (too few pgs?)
pool cephfs_data2 has many more objects per pg than average (too few pgs?)
查看pg数
[root@node1 ~]# ceph osd pool get cephfs_metadata2 pg_num
pg_num:
[root@node1 ~]# ceph osd pool get cephfs_metadata2 pgp_num
pgp_num:
突然想起来当时只是测试安装，而且说pg数可以增加但不能减少，所以只是随便设置一个数。再设置回来即可。
[root@node1 ~]# ceph osd pool set cephfs_metadata2 pg_num
Error E2BIG: specified pg_num is too large (creating new PGs on ~ OSDs exceeds per-OSD max of )
结果出现这个错误，参考“http://www.selinuxplus.com/?p=782”，原来是一次增加的数量有限制。最后选择用暴力的方法解决问题：
[root@node1 my-cluster]# ceph osd pool set cephfs_metadata2 pg_num
[root@node1 my-cluster]# ceph osd pool set cephfs_metadata2 pg_num
[root@node1 my-cluster]# ceph osd pool set cephfs_metadata2 pg_num
[root@node1 my-cluster]# ceph osd pool set cephfs_metadata2 pg_num
[root@node1 my-cluster]# ceph osd pool set cephfs_metadata2 pg_num
[root@node1 my-cluster]# ceph osd pool set cephfs_metadata2 pg_num
[root@node1 my-cluster]# ceph osd pool set cephfs_metadata2 pg_num
[root@node1 my-cluster]# ceph osd pool set cephfs_metadata2 pg_num [root@node1 my-cluster]# ceph osd pool set cephfs_metadata2 pgp_num
[root@node1 my-cluster]# ceph osd pool set cephfs_metadata2 pgp_num
[root@node1 my-cluster]# ceph osd pool set cephfs_metadata2 pgp_num
[root@node1 my-cluster]# ceph osd pool set cephfs_metadata2 pgp_num
[root@node1 my-cluster]# ceph osd pool set cephfs_metadata2 pgp_num
[root@node1 my-cluster]# ceph osd pool set cephfs_metadata2 pgp_num
[root@node1 my-cluster]# ceph osd pool set cephfs_metadata2 pgp_num
[root@node1 my-cluster]# ceph osd pool set cephfs_metadata2 pgp_num
过了大概半个小时，集群就正常了。