[PVE-User] performance issue for synchronised I/O with qcow2 disk images on ZFS

Stephane Chazelas stephane.chazelas at gmail.com
Thu Feb 2 17:21:02 CET 2017


in case you're experiencing very bad synchronised disk I/O
performance (like when updating/installing debian packages) in
QEMU guests, and you're using qcow2 disk images stored on ZFS
file systems, you may want to watch this thread on the QEMU
devel mailing list:


A work-around for now is to revert the pve-qemu-kvm package to
2.6.2 version (anything before 2.7).


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