Thank you for the comment, Simon! The most funny thing is that I've added 3 new hosts to my infrastructure in December, their hardware is awesome, so their hardware refresh is not a matter of the nearest future. :) Anyhow, 6.x works great and the only thing I regret is lacking certain features (such as IOpS limits).
I'm also maintaining a cluster of 5 hosts (primary storages aren't local, they're connected via GlusterFS & NFS) which've been running 6.x too. I've upgraded 3 of hosts from 6.x to 7.x, but when I'm trying to migrate a VM from the "old" hosts to the "new" ones, the migration is being timed out and the VM is being frozen in the "paused" state. I noticed a difference in the CPU-flags set: all the hosts running 7.x have the "nopl" flag, but the hosts running 6.x don't. This option appears only after installing 7.x and maybe this is the cause. Does anyone have any suggestions on the reason that causes freezing the VMs when they've been migrating from the 6.x-powered hosts to the 7.x-powered ones? Is that the "nopl" flag? Is that anything else? Thanks to all!
