Ubuntu
virt-manager package

  1. Bug #568445
  2. Comment #1

Comment 1 for bug 568445

Revision history for this message
Dustin Kirkland  (kirkland) wrote : Re: [Bug 568445] [NEW] LVM backed drives should default to cache='none'

The default is cache=writethrough in the interest of data integrity.
I don't think we want to differ from what upstream KVM provides, on
this point.

Note that the manpage says:

           Some block drivers perform badly with cache=writethrough, most
           notably, qcow2. If performance is more important than correctness,
           cache=writeback should be used with qcow2.

If you believe that this default should be changed, please have that
discussion on the upstream kvm and qemu mailing lists. I believe that
upstream has discussed this and has chosen data integrity over
performance as the default.

Thanks,
:-Dustin