Is exporting a block device from one DomU to another supported? ''xm
block-attach'' appears to support it based on the command line options
displayed but maybe it''s one of those things that doesn''t work
because
nobody ever uses it?
I''m wondering about accessing a VSS snapshot from a windows DomU in
Dom0
(or another DomU). In theory, GPLPV should be able to export the VSS
snapshot volume (assuming it exists as a block device in windows which
I''m not completely sure about...) back to Dom0 as a block device where
Dom0 can mount it (ntfs-3g etc). The IO request would go "Dom0 -> DomU
-> VSS mapping -> Dom0 -> physical device" which is a bit
convoluted but
performance isn''t necessarily the goal here so maybe it''s not
an issue.
If all of the above is possible, are there any back<->front issues with
DomU shutting down (or crashing) while Dom0 (or another DomU) has the
block device open or does xend tear it all down nicely?
Thanks
James
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