On Sat, Jul 15, 2017 at 6:37 AM, Felipe Esteves < felipe.este...@b2wdigital.com> wrote:
> > One point I've noticed, is that Opscenter show "OS: Disk Latency" max with > high values when the problem occurs, but it doesn't reflect in server > directly monitoring, in these tools the IO and latency of disks seems ok. > YMMV, but I've seen something like this due to an issue balancing IRQ interrupts on older 3 series kernels. Check the output of 'cat /proc/interrupts' and make sure the interrupts for the disks and network driver(s) particularly are not contending. This article explains the issue in detail (as well as how to fix it): http://www.alexonlinux.com/smp-affinity-and-proper-interrupt-handling-in-linux
