[fedora-virt] images on tmpfs?

[Kanwar Ranbir Sandhu]

On Sat, 2014-06-07 at 12:33 +0100, Richard W.M. Jones wrote:
> In any case, cache='none' (ie. O_DIRECT) won't work, and you shouldn't
> use it for throwaway test machines anyway.  Since tmpfs always
> disappears at reboot, any machine you create on a tmpfs is a throwaway
> one, whether you intended that or not!
> 
> Use cache='unsafe' on tmpfs.
> 
> (This advice applies to libguestfs, virt-builder, etc too)
> 
> For more info on caching modes, see:
> http://rwmj.wordpress.com/2013/09/02/new-in-libguestfs-allow-cache-mode-to-be-selected/


Does the type of storage being used for the KVM (e.g. LVM, a file, etc.)
change which cache mode should be employed?  I ask because this page
says if raw volumes or partitions are used, the cache should be set to
"none":

http://www.linux-kvm.org/page/Tuning_KVM

Does that still hold true?


Regards,

Ranbir

-- 
Kanwar Ranbir Sandhu
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