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Re: [Xen-devel] [PATCH resend] libxl, hotplug/Linux: default to phy backend for raw format file, take 2

Il 09/01/2015 18:38, Dario Faggioli ha scritto:
On Fri, 2015-01-09 at 14:42 +0000, Wei Liu wrote:
On Thu, Jan 08, 2015 at 03:33:17PM +0100, Fabio Fantoni wrote:
Sorry for the probably stupid question, what are the pros and cons of
default use of phy instead qdisk for raw files as domU disk?

There's no stupid question. :-)

I was told that it performs better and enables other potential

Not a big deal, probably, but IMO it would be nice to have at least a
few words about when it's happening in the changelog, wouldn't it?

I'm also interested in detailed changelog about.

In the meantime, I saw this:
Based on the post above seems that phy will have important risk of data loss if I understand good, from Ian Campbell post:
xl also uses qdisk for raw disk images instead of loop+blkback which
xend used, because there are concerns that the loop driver can lead to
data loss (by not implementing direct i/o the underlying device, and/or
not handling flushes correct, my memory is a bit fuzzy).

Thanks for any reply and sorry for my bad english.


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