As Michael points out, Toolkit 1.6 does include a number (148, to be exact) of Cluster-mode cmdlets. There aren't that many asynchronous APIs in Data ONTAP 8.1 (Cluster-mode), but we expect that to change over time. Those we support with cmdlets do indeed return job ID info, suitable for passing to Get-NcJob. Here's an example:
PS C:\> Start-NcVolMove bigvol aggr1 -Vserver vserver1 | Get-NcJob | fl *
NcController : 10.61.172.155
IsRestarted : False
JobAffinity : cluster
JobCategory : VOPL
JobCompletion :
JobDescription : Move "bigvol" in Vserver "vserver1" to aggregate"aggr1"
JobDropdeadTime :
JobDropdeadTimeDT :
JobEndTime :
JobEndTimeDT :
JobId : 2267
JobName : Volume Move
JobNode : fas3070cluster01-02
JobPriority : high
JobProcess : mgwd
JobProgress : Volume move job in setup
JobQueueTime : 1319639018
JobQueueTimeDT : 10/26/2011 2:23:38 PM
JobSchedule : @now
JobStartTime : 1319639091
JobStartTimeDT : 10/26/2011 2:24:51 PM
JobState : running
JobStatusCode : 0
JobType : MOVE
JobUsername : admin
JobUuid : 18fdbb2b-ffde-11e0-be49-123478563412
JobVserver : fas3070cluster01
IsRestartedSpecified : True
JobDropdeadTimeSpecified: False
JobEndTimeSpecified : False
JobIdSpecified : True
JobQueueTimeSpecified : True
JobStartTimeSpecified : True
JobStatusCodeSpecified : True