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X-HELO:	mailout07.t-online.de
Date:	Sun, 04 Nov 2018 13:59:34 +0100
Subject:	Local rsync disk to disk slow
To:	"cygwin AT cygwin DOT com" <cygwin AT cygwin DOT com>
MIME-Version:	1.0
From:	"Michael Lemke" <lemkemch AT t-online DOT de>
Message-ID:	<op.zryg1kowaqc5s6@orion.localdomain>
User-Agent:	Opera Mail/10.63 (Win32)

I am copying a large directory tree from one internal disk to another USB 3 connected disk on the same computer with this rsync line:

rsync -ahPvzHA --delete /d/Images /q/

This copies files at a rate of 20MB/s. If I copy the same tree with Windows Explorer I get about 90MB/s.

Why is this? The chosen options don't seem to affect the result much.

I noticed three rsync processes one of which is CPU bound at a single core and therefore limiting the performance. This process reads the source files. The other two rsync processes don't consume a noticable amount of CPU time and one of them writes the destination files.

Are there any options to speed up the process? The reason I use rsync is to preserve hard links.

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