System information

4-40 Endurance FTvirtual Server Administrator’s Guide
The list displayed includes all known Quorum Services, including those that are permanently
ineligible and those that are temporarily ineligible. A permanently ineligible Quorum Service
includes any Quorum Service running at an incompatible revision level, or running on the local
Endurance Configuration configuration (i.e., running on CoServer1, CoServer2, or the
FTvirtual Server). An error icon ( ) indicates that a Quorum Service is permanently ineligible.
A temporarily ineligible Quorum Service, which is indicated by a warning icon ( ), includes
any that are not fully visible to both CoServers, or that are specifically disallowed.
The Attributes field displays information about the Quorum Service. The Elected notation
indicates the Quorum Service that is currently elected by this Endurance SplitSite
Configuration. The Disallowed notation indicates that the administrator has blocked the
specified Quorum Service so that it cannot provide service to this Endurance SplitSite
Configuration.
You can modify the Disallowed or Allowed setting by using a right-mouse-button popup menu,
clicking on any row in the tree, as shown below. In general it is preferable to use the Preferred
and Alternate settings from the Quorum Service Preferences property page to force selection
of specific Quorum Services. The Disallow mechanism described here is provided as a
convenience for controlling Quorum Services in a complex environment.
In the lower half of this pane, details are displayed that provide more information about the
Quorum Service that is currently selected in the table.
Overriding Quorum Service Boot Control
A Virtual Server is blocked from booting on a temporary basis until the CoServer is able to
locate either the elected Quorum Server or the remote CoServer. This mechanism protects the
CoServers from uncoordinated or independent execution and possible split-brain operations.
Under some emergency circumstances, it may be necessary to override this protection
mechanism in order to permit one CoServer to boot the Virtual Server and continue application
operations. For instance, when network problems exist, a CoServer may block the Virtual
Server boot until connectivity to either the remote CoServer or the elected Quorum Service is