Change in vdsm[master]: Introduce a maximum time limit a migration may take

lyarwood at redhat.com lyarwood at redhat.com
Tue Nov 26 17:15:45 UTC 2013


Lee Yarwood has posted comments on this change.

Change subject: Introduce a maximum time limit a migration may take
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Patch Set 1:

(1 comment)

After discussing this issue with Vinzenz and Tomas at length today I've suggested that for now we base the overall timeout value on a simple calculation using a percentage of the migration bandwidth.

In the longer term I really think we should move the logic for both calculating this timeout and monitoring migration progression to the engine. 

I've created the following RFEs requesting this :

[RFE] Allow migration configuration values to be set per VM from engine
https://bugzilla.redhat.com/show_bug.cgi?id=1034871

[RFE] Engine should apply a sensible overall timeout to the live migration of guests.
https://bugzilla.redhat.com/show_bug.cgi?id=1034893

....................................................
File lib/vdsm/config.py.in
Line 54:             'Maximum time the destination waits since migration is stalled. '
Line 55:             'Please note, that this is not overall migration timeout. '
Line 56:             'Source waits twice as long (to avoid races).'),
Line 57: 
Line 58:         ('migration_max_time', '21600',
I've suggested that this value is based on the time taken to transfer the memory of a guest given a certain percentage of migration bandwidth. 

For example for a 4GB guest allowing for 50% of the default 32MiB/s migration bandwidth we would set the timeout to 281.
Line 59:             'The maximum time in seconds a migration may take before the '
Line 60:             'migration will be aborted.'),
Line 61: 
Line 62:         ('migration_listener_timeout', '30',


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Gerrit-MessageType: comment
Gerrit-Change-Id: Ifd2f76b9334fcb7d2db24c081cccae15e8fd0b0c
Gerrit-PatchSet: 1
Gerrit-Project: vdsm
Gerrit-Branch: master
Gerrit-Owner: Vinzenz Feenstra <vfeenstr at redhat.com>
Gerrit-Reviewer: Dan Kenigsberg <danken at redhat.com>
Gerrit-Reviewer: Lee Yarwood <lyarwood at redhat.com>
Gerrit-Reviewer: Michal Skrivanek <michal.skrivanek at redhat.com>
Gerrit-Reviewer: Tomáš Došek <tdosek at redhat.com>
Gerrit-Reviewer: oVirt Jenkins CI Server
Gerrit-HasComments: Yes


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