Novell LINUX ENTERPRISE 11 - HIGH AVAILABILITY, Руководство пользователя, Страница: 25 / 298

1.5.1 New Features and Functions Added
Migration Threshold and Failure Timeouts
The High Availability Extension now comes with the concept of a migration
threshold and failure timeout. You can define a number of failures for resources,
after which they will migrate to a new node. By default, the node will no longer
be allowed to run the failed resource until the administrator manually resets the
resource’s failcount. However it is also possible to expire them by setting the re-
source’s
failure-timeout
option.
Resource and Operation Defaults
You can now set global defaults for resource options and operations.
Support for Offline Configuration Changes
Often it is desirable to preview the effects of a series of changes before updating
the configuration atomically. You can now create a “shadow” copy of the
configuration that can be edited with the command line interface, before committing
it and thus changing the active cluster configuration atomically.
Reusing Rules, Options and Sets of Operations
Rules, instance_attributes, meta_attributes and sets of operations can be defined
once and referenced in multiple places.
Using XPath Expressions for Certain Operations in the CIB
The CIB now accepts XPath-based
create
,
modify
,
delete
operations. For
more information, refer to the
cibadmin
help text.
Multi-dimensional Collocation and Ordering Constraints
For creating a set of collocated resources, previously you could either define a re-
source group (which could not always accurately express the design) or you could
define each relationship as an individual constraint—causing a constraint explosion
as the number of resources and combinations grew. Now you can also use an alter-
nate form of collocation constraints by defining
resource_sets
.
Connection to the CIB From Non-cluster Machines
Provided Pacemaker is installed on a machine, it is possible to connect to the
cluster even if the machine itself is not a part of it.
Conceptual Overview 15