rsync --inplace dead slow
devzero at web.de
Mon Jul 15 07:54:10 UTC 2019
i observe a weird performance problem while trying to rsync .vhd image
files from xenserver to linux backupserver.
i have broken the problem down to a single 500gb file which gets
pathological slow on subsequent runs.
rsync begins with decent speed (250MB/s), i can see that with --progress
and also verify with iotop.
After a while, rsync performance drops down to <3MB/s where i see cpu at
100% on the sender side.
I'm using rsync in daemon mode, receiver is 3.1.2 and sender is 3.1.1.
No encryption or compression in place.
What is causing this slowness?
I know about
according to that article, the problem should have been adressed.
Is there still possibility for "pathological slow performance" which
lies in algorithm/design? (as it does not look like a server/system
performance for me)
More information about the rsync