slow down on disk operiations

michabbs

Active Member
May 5, 2020
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I have one qemu Windows server vm and a couple of lxc containers in one node. Whenever I perform (inside the host machine) any disk-expensive operation (like "dd 100GB-zvol") - the Windows guest slows down. Actually this is not so unexpected... but the problem is that it slows down too much, so that the vm becomes unusable for human. :-( (It speeds up back when the disk operation is over.)
Any way to prioritize kvm a little bit more, so that Windows was still usable?

node: ZFS, 64G ram, 24 threads
guest: 24 ram, 8 threads