El 01/08/16 a las 08:50, Alexandre Derumier escribió:
As reported by Eneko Lacunza,
ceph/rbd by default use writethrough even if writeback is defined, until a
flush is detected.
We currently use writeback without sendind any flush for 3 things:
qemu-img convert : (default is unsafe, but we force writeback in qemuserver)
vma restore on target destination
vmstate snapshot
The patches serie set unsafe opening (BDRV_O_NO_FLUSH).
And also fix the rbd drive to disable cache_writethtrough_until_flush if
cache=unsafe
@Eneko Lacunza : Can you test it ? I have rewrote your last patch
(http://pve.proxmox.com/pipermail/pve-devel/2016-July/022226.html),
to handle vma extract and vmstate snapshot
I can confirm that extract performance is good with your patch series.
On a side note, it's interesting to see that either a series of patches
or a slow almost-holiday week is needed to readers in the list pay
attention ;)
Cheers
Eneko
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