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    It's not really like I'm concerned about performance it just makes me feel quite uncomfortable when VM fails to boot with blk i/o errors during VM boot when host is reading some files ._. Commented Feb 27, 2017 at 13:37
  • I improved the answer. Indeed if things reach that level, you should consider having a test rig. I have a server with SSD disks, freeBSD+ZFS+bhyve just for my own personal use at work. Commented Feb 27, 2017 at 18:53
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    The most hilarious thing is that it works like on/off switch. When I send STOP signal to heavy i/o process VMs work, when CONT they stop working. So at this point I'm just pausing i/o for VM boot and then resuming it but it's quite well... Inconveniet? at least... Commented Feb 27, 2017 at 19:06
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    Are they on the same disk controller? What is the load of CPU on the host? Commented Feb 27, 2017 at 19:12
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    IT makes sense. I have added things to the answer again. It would have had helped you including that data on the question. Commented Feb 27, 2017 at 19:17