Daniel Erez has posted comments on this change.

Change subject: engine,frontend: disable new vm button if no DC is up
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Patch Set 3: Code-Review-1

As described in details under the context of bug 993639 [1], 
I think we should refrain any queries in syncSearch/updateActionAvailability 
methods.
These methods are invoked every 5 seconds (by default), hence, to prevent 
additional performance penalty (on client/server),
we try to limit the syncSearch to merely retrieve the items (especially on a 
main-tab...). See discussion in [1].

What do you thing? Any alternative solution instead of graying out the button?
E.g. a warning in new VM dialog

[1] https://bugzilla.redhat.com/show_bug.cgi?id=993639

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Gerrit-MessageType: comment
Gerrit-Change-Id: Id537ac56bd2d963999c5c77ea3e92b3987d82525
Gerrit-PatchSet: 3
Gerrit-Project: ovirt-engine
Gerrit-Branch: master
Gerrit-Owner: Tomas Jelinek <tjeli...@redhat.com>
Gerrit-Reviewer: Daniel Erez <de...@redhat.com>
Gerrit-Reviewer: Omer Frenkel <ofren...@redhat.com>
Gerrit-Reviewer: Tomas Jelinek <tjeli...@redhat.com>
Gerrit-Reviewer: Vojtech Szocs <vsz...@redhat.com>
Gerrit-Reviewer: oVirt Jenkins CI Server
Gerrit-HasComments: No
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