[Xen-users] easy high availability storage

["Roland Frei" <frei@xxxxxxxxxxxx>]

i want to setup a easy high availability storage system for xen guest os.  
(1 pc that run xen and 2 nas for storage)
THE HARDAWARE
  PC1 runns has 2 physical lan interfaces. the interfaces are directly  
connected to 2 separated nas.
  the nas are basic file servers .. no special setup.

GUEST OS
  on pc1 a host os is installed that runns xen.

XEN
  xen provides a virtual disc for the guest os. HERE IS THE THING: instead  
that this virtual disc is stored on one drive, is should be STORED ON 2  
NETWORK SHARES. (something like raid1 over lan)
IN CASE OF CRASH
  server1 or server 2 can crash completely.
  lan1 or lan2 can crash or be unplugged
  switch1 or switch2 can have failure
  the xen virtual disk "driver"  will continue working on the other nas.

AFTER CRASH
  if both nas/lan run again, the xen virtual disk "driver" should resync  
the crashed system with the running disc.
THE QUESTION
  is it possible to setup xen so that is uses the 2 network share to store  
the virtual discs ?
(of corse there will be many pc's that use this 2 nas systems for storage  
.. and/or multiple xen can run on it... so at the end nas1 and nas2 will  
host many discs. it would be perfect if the disc taht runs the guest os  
and xen will be a cd-iso or usb-stick)

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