Update: I had to wipe my CephFS, because after I increased the beacon
grace period on the last attempt, I couldn't get the MDSs to rejoin
anymore at all without running out of memory on the machine. I tried
wiping all sessions and the journal, but it didn't work. In the end all
I achieved was that the daemons crashed right after starting with some
assertion error. So now I have a fresh CephFS and will try to copy the
data from scratch.
On 24.07.19 15:36, Feng Zhang wrote:
Does Ceph-fuse mount also has the same issue?
That's hard to say. I started with the kernel module and saw the same
behaviour again. I got to 930k inodes after only two minutes and stopped
there. Since then, this number has not gone back down, not even after I
disconnected all clients. I retried the same with ceph-fuse and the
number did not increase any further (although it did not decrease
either). When I unmounted the share and remounted it with the kernel
module again, the number rose to 948k almost immediately.
So it looks like the problem only occurs with the kernel module, but
maybe ceph-fuse is just too slow to tell. In fact, it is a magnitude
slower. I only get 1.3k reqs/s compared to the 20k req/s with the kernel
module, which is not practical at all.
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