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[Xen-API] xenserver and dom0 vdi io cache

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 Cardon
Tranquil IT Systems
Les Espaces Jules Verne, bâtiment A
12 avenue Jules Verne
44230 Saint Sébastien sur Loire
tel : +33 (0)

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