> I wonder that OSDs use system calls of Virtual File System (i.e. open, read, > write, etc) when they access disks. > > I mean ... Could I monitor I/O command requested by OSD to disks if I > monitor VFS? Ceph OSDs run on top of a traditional filesystem, so long as they support xattrs - xfs by default. As such you can use kernel instrumentation to view what is going on "under" the Ceph OSDs. -- Kyle
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