> On Jun 20, 2016, at 5:15 AM, Ulrich Leodolter <ulrich.leodol...@obvsg.at> 
> wrote:
> 
> has anyone an idea why iSCSI read performance degraded in CentOS 7.2 ?

I'm not sure about those versions of centos, but iSCSI throughput being TCP is 
dependent on TCP receive window and packet loss. Tcpdump to see if the TCP 
window changed between those versions of centos.
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