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Re: [Xen-API] Snapshot causes disk errors and VM crashes

  • To: 'Mark Benson' <md.benson@xxxxxxxxx>, "xen-api@xxxxxxxxxxxxx" <xen-api@xxxxxxxxxxxxx>
  • From: Thanos Makatos <thanos.makatos@xxxxxxxxxx>
  • Date: Thu, 20 Nov 2014 10:36:21 +0000
  • Accept-language: en-GB, en-US
  • Delivery-date: Thu, 20 Nov 2014 10:37:44 +0000
  • List-id: User and development list for XCP and XAPI <xen-api.lists.xen.org>
  • Thread-index: AQHQBK1K4fiUQcRZpEaGn+rvv5VNlZxpUbCQ
  • Thread-topic: [Xen-API] Snapshot causes disk errors and VM crashes

> I installed the xs-tools on the VM from the XenServer 6.2 distribution, and
> most everything works just fine, however I have stumbled on an issue that's
> struck me 3 times on 2 serparate servers. When I take a live snapshot,
> *sometimes* (not always) the guest OS pukes and starts throwing disk
> errors. It effectively nails the guest OS And causes it to die with miles of 
> IO
> errros all over the console. It's not pretty :\
> Any ideas? I'm pretty sure in the latest instance the guest OS was fully 
> loaded
> and sitting at a login prompt at the time, so it wasn't the lack of the 
> xs-tool
> daemon as far as I can see. Maybe something a process was doing in the
> background on the guest interfered?

Looks like something goes bust in the VM datapath, can you check /var/log/SMlog 
for exceptions and /var/log/{daemon.log,kern.log,messages,syslog} for any 
tapdisk errors? (grep for "tap-err" and "segfault")
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