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

[Wei Liu <wei.liu2@xxxxxxxxxx>]

On Thu, Jan 08, 2015 at 03:33:17PM +0100, Fabio Fantoni wrote:
> Il 08/01/2015 14:46, Wei Liu ha scritto:
> >This patch resurrects 11a63a166. The previous patch had a bug that
> >wrong "physical-device" was written to xenstore causing block script
> >execution fail. This patch fixes that problem.
> >
> >Following configurations have been tested:
> >
> >1. Raw file and PV
> >2. Raw file and HVM
> >3. Block device and PV
> >4. Block device and HVM
> >
> >Creation / destruction / local migration all worked.
> >
> >Original commit message from 11a63a166:
> >
> >Modify libxl and hotplug script to allow raw format file to use phy
> >backend.
> >
> >The block script now tests the path and determine the actual type of
> >file (block device or regular file) then use the actual type to
> >determine which branch to run.
> >
> >With these changes, plus the current ordering of backend preference (phy
> >>qdisk > tap), we will use phy backend for raw format file by default.
> 
> 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
improvements.

Wei.

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