[pve-devel] Default cache mode for VM hard drives

Wolfgang Bumiller w.bumiller at proxmox.com
Thu May 28 13:48:00 CEST 2015


> On May 28, 2015 at 1:31 PM Eneko Lacunza <elacunza at binovo.es> wrote:
> I'm not kernel/IO expert in any way, but I think this test program has a 
> race condition, so it is not helping us diagnose the problem.
> 
> We're writing to buffer x while it is in use by write syscall. This is 
> plainly wrong on userspace.

Yes, that's the point. The same seems to be happening in qemu.
We seem to be defaulting to `cache=nocache` on *our* side btw. (qemu's default
would be `writethrough` if I'm seeing this correctly).



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