On Fri, Apr 09, 2010 at 07:13:22AM -0700, Fantu wrote:
>
> Someone can explain me good difference between file and tap:aio, pros and
> cons, and also with all possibility with blktap2? Thanks for any response
>
file: uses dom0 kernel page cache, and thus might give better performance than 
phy: or tap:aio:,
but it's also more insecure because of the caching.
tap:aio: uses direct IO, so it bypasses dom0 kernel caches, and works like phy: 
in that sense.
blktap1 provides also other modes than :aio, like: qcow, but those were not 
very stable or fast,
so blktap2 was developed. for blktap1 see: 
http://wiki.xensource.com/xenwiki/blktap .
blktap2 also has vhd image support including snapshots and cloning.
See here: http://wiki.xensource.com/xenwiki/blktap2 .
-- Pasi
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