[Bug 550409] Re: Slow disk IO for all guests with all disc modes and types.

[agent 8131]

People should be aware that cache=writeback should only be used if you
do not care about the very real possibility of guest disk corruption
should the guest or host fail unexpectedly.  Given that there is no
facility for shutting down guests cleanly on host shutdown one should be
very wary of risking their guest data for anything important.

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https://bugs.launchpad.net/bugs/550409

Title:
  Slow disk IO for all guests with all disc modes and types.