If memory serves me right, the 5% bandwidth is actually prioritized when you do something on the switch via SSH/Telnet/J-Web so that in case your switch is running line-rate, you can actually log into it.
Also, disable flow-control, it's not helping. Regards, Eugeniu On Wed, Oct 15, 2014 at 2:49 AM, Mike Gonnason <gonna...@gmail.com> wrote: > For my iSCSI stuff, I have been disabling pause frames as they are not > really beneficial for my situation. I had a NetApp (forget what model) that > would saturate a 10Gb link and the Juniper would send a pause frame with > the result of dropping all connections across that trunk. Not very helpful. > > You can try modifying the NC class and alter how the scheduling is > performed. in section 21 you can see 5% is specified for the NC scheduler. > > > http://www.juniper.net/documentation/en_US/junos13.2/topics/example/cos-ex-series-configuring.html > > > -Mike Gonnason > > On Tue, Oct 14, 2014 at 3:39 PM, Josh Farrelly <jo...@originit.co.nz> > wrote: > > > Hi all. > > > > We have 2x EX4550's in VC that provide switching for an iSCSI network. > > There are 3 Dell SANs and 4 Dell R820 ESXi hosts connected via twinax @ > > 10Gbps. Jumbo frames and flow control is enabled. > > > > My knowledge around Juniper tech is a little vague, but what's with the > > default CoS settings on the switch? It seems they will automatically > > reserve 5% for network control traffic. Is there anyway to disable CoS > > entirely? AFAIK Brocade & Cisco don't have this type of default, and 5% > of > > a 10Gbps is actually a rather significant chunk of bandwidth. > > > > The reason I'm asking is that we've seen some performance issues lately. > > We have a hybrid-SSD tray of storage that can saturate a link, so we're > > seeing MAC pause frames being received by the switch as well as discards > on > > some of the queues. > > > > Thanks for any pointers. > > > > Regards, > > > > Josh. > > _______________________________________________ > > juniper-nsp mailing list juniper-nsp@puck.nether.net > > https://puck.nether.net/mailman/listinfo/juniper-nsp > > > _______________________________________________ > juniper-nsp mailing list juniper-nsp@puck.nether.net > https://puck.nether.net/mailman/listinfo/juniper-nsp > _______________________________________________ juniper-nsp mailing list juniper-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/juniper-nsp