Rsyncing via LAN deadly slow
stephaneascoet at free.fr
Thu Apr 9 13:48:30 UTC 2020
Hi, I'm backing up contents of my
before it dies completely on a dell laptop via my LAN(netstat indicates a
11.8MB/s speed between the two computers via this one).
On the GOBook I launch "rsync --daemon"(3.1.1-3 version)
On the dell: rsync -abSbHXz --progress(3.1.2-1 version)
CPUs are doing almost nothing. So does the GOBook HDD. The destination is on a
mounted logical volume in Ext2 on a nvme SSD.
And the indicated speed transfer is around 50kB/s!!! I tried -W option: it's
even slower. Same thing when I put off the "z"(anyway, CPUs aren't doing nothing).
If I netstat during the backup, it appears that there is about 4MB/s used, so
almost 100 times more than the actual data written on destination! And why not
11MB/s since my network can do it?
I spent hours searching an explanation on the Web, nothing explaining what's
happening in a sufficient satisfaying way for me. Does somenone on this list
have a clue?
Sincerely, Stephane Ascoet
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