[c-nsp] Packet-level iSCSI debugging

Nick Hilliard nick at foobar.org
Sun Feb 2 12:03:00 EST 2014

On 02/02/2014 01:41, Mike Hale wrote:
> the utilization is well below 10gigs

what you mean here is that "the utilization is well below 10gigs averaged
over the sampling period".  Iscsi is sensitive to dropped packets, and it
could be that you're dropping packets due to traffic bursts which are too
short to see on your graph sampling period (300 seconds? most graphs use
300s by default).  Check out the dropped packet counts on all your iscsi
ports and see what's happening there.  Even better, monitor the packet drop
rate on your graphing system and build up a profile of what's happening.


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