On Tue, Dec 23, 2008 at 12:21 PM,  <r...@megabit.net> wrote:
> my storage backend system is capable of handling writes at around 120MB/sec. 
> Its running
> the iscsi enterprise target under ubuntu hardy and the open-iscsi initiators 
> are debian etch
> systems, all connected via gigabit lan. Yesterday I did some load tests and 
> it looks like I won't
> get any further than 50MB/sec (read and write) on the client side. This is 
> enough for my
> purpose but what struck me during the tests is that dstat showed network 
> traffic of roughly
> 80-100MB/sec coming in on the target side. Is this a problem of dstat or does 
> iSCSI really add
> 100% transportation overhead? I haven't done any tweaks to this side of the 
> setup and the
> tests were done via dd (writing/reading from/to /dev/zero and /dev/null with 
> the fsync option set).

Please check the readahead settings, as is e.g. explained in this
thread: 
http://groups.google.com/group/open-iscsi/browse_thread/thread/37741fb3b3eca1e4/3f1fb18a136ff00f?lnk=gst&q=readahead#3f1fb18a136ff00f.

Bart.

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