Hi,
I would like to add a datapoint. I rebooted one of our client machines
into kernel 5.4.0-135-generic (latest ubuntu 20.04 non hwe kernel) and
performed the same test (copying a large file within cephfs).
Both the source and target files stay in cache completely:
# fincore bar
RES PAGES SIZE FILE
10G 2621353 10G bar
They also stay there for some time until the cap is eventually revoked
by the MDS or the local cache is flushed. This is the expected behavior.
Regards,
Burkhard
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