Bug 831476 - [rhevm] - RFE - Allow VM Mirroring when a host is down the Mirrored VM can automaticaly migrate to different host without rebooting it
[rhevm] - RFE - Allow VM Mirroring when a host is down the Mirrored VM can au...
Status: CLOSED NOTABUG
Product: Red Hat Enterprise Virtualization Manager
Classification: Red Hat
Component: RFEs (Show other bugs)
3.1.0
Unspecified Unspecified
unspecified Severity high
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Assigned To: Miki Kenneth
Yaniv Kaul
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Depends On:
Blocks:
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Reported: 2012-06-13 01:37 EDT by David Botzer
Modified: 2015-09-22 09 EDT (History)
6 users (show)

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Doc Type: Bug Fix
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Last Closed: 2012-06-13 07:38:42 EDT
Type: Bug
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Description David Botzer 2012-06-13 01:37:09 EDT
Description of problem:
Allow VM Mirroring for a Running VM,
when a host is down the Mirrored VM can automaticaly migrate to different host without rebooting that VM.

When a host is shutdown or experience a power shortage all its VMs are stopped.
They can be migrated to a different host, but they have to be restarted

In this case the VM that is mirrored can be migrate to working host and continue running normally.

Version-Release number of selected component (if applicable):
rhevm 3.1 si4

How reproducible:
always

Steps to Reproduce:
1.Create a 2 hosts and only one with 2 VMs
  Mark those VMs as mirrored and choose a storage for the mirror
2.Shutdown the Host
3.The VMs should continue running from any avaialbe host
  from their last known state
  
Actual results:
VMs are restarted when host is down

Expected results:
VMs should conitune running without iterference

Additional info:
Comment 1 Itamar Heim 2012-06-13 02:33:12 EDT
i don't understand.
is this about VMs on local storage?
becasue there is no need to mirror the disk on shared storage.
and we have HA flag to auto-restart guests on host failure.

do you mean fault-tolerant (live migrate the memory all the time)?
Comment 2 David Botzer 2012-06-13 02:48:29 EDT
*I would like to avoid auto-restart the VM,*
 even if the host its running on had been shutdown.

In order to do so, we should keep a mirror image of the VM for example each 5min sample the VM to be updated.

And when the host is down the VM running on the stopped host will run on a different host as if nothing happend.

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