[pve-devel] default cache option=none vs writeback

[Stefan Priebe - Profihost AG]

Hi,

for cache=none librbd disables the rbd cache internal. Only for
cache=writeback it enables the internal rbd cache.

At least that's what the devs of ceph told me. I also encouraged data
loss when using cache=writeback with rbd and crashing VMs and i haven#t
seen this since using cache=none.

Greets,
Stefan
Am 14.02.2013 08:56, schrieb Dietmar Maurer:
>> but i think it's still crazy for the users - for me too. An example is RBD. Default
>> is writeback but rbd still behaves differently if you select default or if you
>> select writeback.
> 
> Why is that different?
>