Question: data consistency on fail-over using shared disk

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Hi,


We are now checking about what we should do on vm fail-over.

Concerning this, does anybody know about any danger about data
consistency when we are using shared disk?


What I'm concerning is if crashed VM-side host is still holding
buffered data, starting a new VM instance on another node may
result in file system corruption.

  This problem may similar to live-migration but little bit different
  in the sense that VM is crashed -> cannot do anything from that point.


How about the combination of old or new guest OS and the following
settings?

 - writethrough
 - writeback
 - none

If needed, we'll do sync by HA-side scripts before starting a new VM
instance.


Thanks,
  Takuya
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