Using a partitionned cache with off-heap storage for backup data

Hi,
Is it possible to define a partitionned cache (with data into the heap) with off-heap storage for backup data ?
I think it could be worthwhile to do so, as backup data are associated with a different access pattern.
If so, what are the impacts of such off-heap storage for backup data ?
Particularly, what are the impacts on performance ?
Thanks.
Regards,
Dominique

Hi,
It seems what using scheme for backup-store is broken in latest version of Coherence, I've got an exception using your setup.
2010-07-24 12:21:16.562/7.969 Oracle Coherence GE 3.6.0.0 <Error> (thread=DistributedCache, member=1): java.lang.NullPointerException
     at com.tangosol.net.DefaultConfigurableCacheFactory.findSchemeMapping(DefaultConfigurableCacheFactory.java:466)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$Storage$BackingManager.isPartitioned(PartitionedCache.java:10)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$Storage.instantiateBackupMap(PartitionedCache.java:24)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$Storage.setCacheName(PartitionedCache.java:29)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$ServiceConfig$ConfigListener.entryInserted(PartitionedCache.java:17)
     at com.tangosol.util.MapEvent.dispatch(MapEvent.java:266)
     at com.tangosol.util.MapEvent.dispatch(MapEvent.java:226)
     at com.tangosol.util.MapListenerSupport.fireEvent(MapListenerSupport.java:556)
     at com.tangosol.util.ObservableHashMap.dispatchEvent(ObservableHashMap.java:229)
     at com.tangosol.util.ObservableHashMap$Entry.onAdd(ObservableHashMap.java:270)
     at com.tangosol.util.SafeHashMap.put(SafeHashMap.java:244)
     at com.tangosol.coherence.component.util.ServiceConfig$Map.put(ServiceConfig.java:43)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache$StorageIdRequest.onReceived(PartitionedCache.java:45)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onMessage(Grid.java:11)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.Grid.onNotify(Grid.java:33)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.PartitionedService.onNotify(PartitionedService.java:3)
     at com.tangosol.coherence.component.util.daemon.queueProcessor.service.grid.partitionedService.PartitionedCache.onNotify(PartitionedCache.java:3)
     at com.tangosol.coherence.component.util.Daemon.run(Daemon.java:42)
     at java.lang.Thread.run(Thread.java:619)Tracing in debuger has shown what problem is in PartitionedCache$Storage#setCacheName(String) method, it calls instantiateBackingMap(String) before setting __m_CacheName field.
It is broken in 3.6.0b17229
PS using asynchronous wrapper around disk based backup storage should reduce performance impact

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