System Management Release Notes
4.17 Mixed-version Cluster Compatibility of a Six-member Shadowset
• Once the shadowset has been enabled to use "Extended Memberships"
shadowing feature, the characteristic is maintained even if the membership
is reduced to less than four members. The characteristic is retained until the
shadowset is dismounted clusterwide.
• This shadowing feature is not ported onto OpenVMS VAX. If a shadowset is
mounted on OpenVMS Alpha or OpenVMS Integrity servers without enabling
this feature, the shadowset will mount on the OpenVMS VAX systems. The
Virtual Unit characteristic voting ensures compatibility.
4.18 Backward Compatibility of a Six-member Shadowset
V8.4
A new area of the Storage Control Block (SCB) of disk stores the extended
membership arrays required to support the "Extended Membership" shadowing
feature. Therefore, an attempt to mount a six-member shadowset on prior
versions of OpenVMS works only if the members are specified in the command
line.
In OpenVMS prior versions, the $MOUNT/INCLUDE qualifier which is used for
reconstructing the shadowset, can find only the existing membership list and not
the new membership area in the SCB. Hence, it does not mount any members
from the new extended membership area in the SCB.
This problem has been fixed in OpenVMS Version 8.4 upgrade kit.
4.19 WBEM Services and WBEM Providers for OpenVMS
This section describes known problems and restrictions in WBEM.
4.19.1 Increased CPU Consumption With WBEM on OpenVMS Guest
V8.4
OpenVMS Guest has a known issue where the CPU consumption of the host
gradually increases with the time when WBEM is configured and running on the
guest. Due to this issue, the guest responsiveness gradually decreases with the
time, although there is no workload on the guest.
The workaround for this problem is to stop and restart WBEM on the guest when
responsiveness is slow by entering the following command:
$ @SYS$STARTUP:WBEM_SERVICES$SHUTDOWN ! Shutdown WBEM on the guest
$ @SYS$STARTUP:WBEM_SERVICES$STARTUP ! Startup WBEM on the guest
Alternately, you can reboot the OpenVMS guest when the responsiveness is slow.
4.19.2 WBEM Providers Support for OpenVMS Guest
V8.4
WBEM Providers running on OpenVMS guest does not support WBEM instance
data and event indications for CPU, Memory, Enclosure, Chassis, Fan, Power
Supply, and Management Processor, since the guest is running in a virtual
machine. This will be supported by WBEM providers running on the underlying
VM Host operating system.
4–18 System Management Release Notes
