Hi *,
I'm wondering about what actually happens in the ceph cluster if I
copy/sync the content of one bucket into a different bucket. I'll just
describe what I saw and maybe someone could clarify what is happening.
I have a RGW in a small test cluster (15.2.2) and created a bucket
(bucket1) with s3cmd, then put a large file into bucket1. This takes
some time, of course, I see the network utilization on the client and
also the OSD load on the cluster during the upload (expected).
Then I create bucket2 and run 's3cmd cp s3://bucket1/file
s3://bucket2' which takes only a couple of seconds. I only see some
OSD load for a short period of time during the copy process, but
that's it. The copied file is available almost immediately.
How does this work? It seems as if there's (almost) no client traffic
(except for the cp command, of course) to recreate the file in the
second bucket, as if the OSDs are directly instructed to create copies
of the objects.
I would highly appreciate it if anyone could clarify this for me.
Thanks!
Eugen
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