On Thu, Oct 27, 2016 at 12:35 PM, Gordon Messmer <gordon.messmer at gmail.com> wrote: > On 10/26/2016 09:54 PM, Larry Martell wrote: >> >> And on the C6 client there is a similar blocked message for the ftp >> job, blocked on nfs_flush, then the bad sequence number message I had >> seen before, and at that point the ftp_job hung. > > > > Are any of these systems using jumbo frames? Check the MTU in the output of > "ip link show" on every system, server and client. If any device doesn't > match the MTU of all of the others, that might cause the problem you're > describing. And if they all match, but they're larger than 1500, a switch > that doesn't support jumbo frames would also cause the problem you're > describing. They all are 1500.