Hello, In the context of https://tracker.ceph.com/issues/64298, I decided to do something manually. In the help output of "ceph tell" for an MDS, I found these possibly useful commands: dirfrag ls <path>: List fragments in directory dirfrag merge <path> <frag>: De-fragment directory by path dirfrag split <path> <frag> <bits:int>: Fragment directory by path They accept the "frag" argument that is underdocumented. In the testsuite, they are used, and it seems like this argument accepts some notation containing a slash, which is also produced as "str" by "dirfrag ls". Can anyone explain the meaning of the parts before and after the slash? What is the relation between the accepted values for "dirfrag split" and the output of "dirfrag ls" - do I just feed the fragment from "dirfrag ls" to "dirfrag split" as-is? Is running "dirfrag split" manually safe on a production cluster? Thanks in advance. -- Alexander Patrakov