Created attachment 560569 [details]
engine.log

When trying to extend a storage domain that isn't reachable from all hosts, the following text is shown as a CanDoAction error: "Error: Cannot extend Storage Domain. Storage device is unreachable from ${hostName}."

Also, engine.log shows the following exception:
2012-02-09 14:29:41,756 ERROR [org.ovirt.engine.core.bll.storage.ExtendSANStorageDomainCommand] (http--0.0.0.0-8080-12) Error during C
anDoActionFailure.: java.lang.NullPointerException
        at org.ovirt.engine.core.bll.storage.ExtendSANStorageDomainCommand.canDoAction(ExtendSANStorageDomainCommand.java:55) [engine-
bll.jar:]
        at org.ovirt.engine.core.bll.CommandBase.InternalCanDoAction(CommandBase.java:385) [engine-bll.jar:]
        at org.ovirt.engine.core.bll.CommandBase.ExecuteAction(CommandBase.java:205) [engine-bll.jar:]
        at org.ovirt.engine.core.bll.Backend.runActionImpl(Backend.java:262) [engine-bll.jar:]
        at org.ovirt.engine.core.bll.Backend.RunAction(Backend.java:244) [engine-bll.jar:]
        at sun.reflect.GeneratedMethodAccessor321.invoke(Unknown Source) [:1.6.0_22]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [:1.6.0_22]
        at java.lang.reflect.Method.invoke(Method.java:616) [:1.6.0_22]
        at org.jboss.as.ee.component.ManagedReferenceMethodInterceptorFactory$ManagedReferenceMethodInterceptor.processInvocation(Mana
gedReferenceMethodInterceptorFactory.java:72) [jboss-as-ee-7.1.0.Beta1b.jar:]
        at org.jboss.invocation.InterceptorContext.proceed(InterceptorContext.java:288) [jboss-invocation-1.1.1.Final.jar:]
        at org.jboss.invocation.InterceptorContext$Invocation.proceed(InterceptorContext.java:374) [jboss-invocation-1.1.1.Final.jar:]
        at org.ovirt.engine.core.utils.ThreadLocalSessionCleanerInterceptor.injectWebContextToThreadLocal(ThreadLocalSessionCleanerInt
erceptor.java:11) [utils-3.0.0-0001.jar:]
        at sun.reflect.GeneratedMethodAccessor15.invoke(Unknown Source) [:1.6.0_22]
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) [:1.6.0_22]
        at java.lang.reflect.Method.invoke(Method.java:616) [:1.6.0_22]
[...]