[Info-vax] HPVM, OpenVMS Clustering and Volume Shadowing

[Dave]

      We have been discussing locally, the idea of OpenVMS as a Guest
on HPVM, however, I seem to recall reading, or hearing, that there are
certain limitations/restrictions/issues associated with Volume
Shadowing and clustering, when the OpenVMS nodes are guests within
HPVM’s.      Can you refresh my memory, or reassure me that this is
not the case.

      We are currently running a 4 node cluster (3 x bl860c’s running
8.3-1H1, and 1 DS10 running Alpha 8.3).     Data integrity is
maintained by running Volume Shadowing and creating shadow sets with
units presented from XP subsystems located in two separate data
centers (5 mile separation).

      As a theoretical exercise, we are examining the idea of adding a
5th node to the cluster, where this new node would be a HPVM
guest.      The main questions are,

1.	If this 5th node is an OpenVMS guest instance on HPVM, will it be
able to see, and mount the Cluster-wide shadow volumes, either
directly, or via MSCP??
2.	Are there any special considerations that need to be taken into
account on the Guest instance.
3.	Are there other considerations (regarding say, Clustering) which we
need to be aware of??

If anyone any experience with this type of configuration and would be
willing to share, I'd be grateful.

Thanks for any information you can provide.

Dave.