[Xen-API] xenserver and dom0 vdi io cache

[Denis Cardon <denis.cardon@xxxxxxxxxxxxxxxxxxxxxx>]

Hi everyone,

I've been a very long time xen then xcp then xenserver user (and still 
run very happily with them). Recently I've had to use virtualbox for 
demo'ing a project on my laptop and was very impressed by the io 
throughtput. Knowing that my laptop definitly hadn't a high end raid5 of 
ssd beneath, I quickly found that there is a small checkbox "Use host 
I/O cache" in the disk configuration. If this is unchecked io 
throughtput in VMs get a nose dive and get back to normal.
I'm not looking at comparing the apple and orange thing, since host RAM 
to do writeback cache cannot be compared with a proper io chain like in 
xenserver.
However there are a few scenario, like non critical virtual desktop or 
test/development/integration virtual machines where I think that I could 
bear with data loss in case of poweroutage or hardware failure in 
exchange for a great io boost.
So my question is is there a way to enable such a writeback cache at the 
VDI/VBD disk level in XenServer?
Thanks a lot,

Denis




--
Denis Cardon
Tranquil IT Systems
Les Espaces Jules Verne, bâtiment A
12 avenue Jules Verne
44230 Saint Sébastien sur Loire
tel : +33 (0) 2.40.97.57.55
http://www.tranquil-it-systems.fr


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