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From: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
To: KVM list <kvm@vger.kernel.org>
Subject: Question: data consistency on fail-over using shared disk
Date: Wed, 21 Jul 2010 15:27:28 +0900	[thread overview]
Message-ID: <4C469350.3080008@oss.ntt.co.jp> (raw)

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

             reply	other threads:[~2010-07-21  6:27 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-07-21  6:27 Takuya Yoshikawa [this message]
2010-07-21  7:27 ` Question: data consistency on fail-over using shared disk Avi Kivity
2010-07-21  7:43   ` Takuya Yoshikawa
2010-07-21 10:46     ` Avi Kivity
2010-07-22  0:41       ` Fernando Luis Vázquez Cao

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