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The Question is:
Installed image file section synchronization on a cluster.
I have an application that runs on both nodes in a cluster and expect to share
data from an image section file installed from a cluster common disk. A
$MGBLSC is issued when the image starts, and everytime a value is changed in
the section, a $UPDSEC is i
ssued. The problem is that the values on each node appear to be independant of
the other. Have I missed a basic concept? Am I allowed to use global sections
this way?
Thanks in advance.
The Answer is :
Neither global sections with backing storage nor commons are valid
means to share memory across the members of a cluster. These are
node-local constructs. (The OpenVMS Wizard will ignore the use
of galactic sections for the purposes of this discussion.)
The OpenVMS Wizard would strongly encourage use of standard RMS
files, and with global buffers enabled. By the time you complete
your current approach -- particularly reflecting the necessary
memory barriers, cluster-wide interlocks, and notifications --
you will have (re)implemented RMS (with global buffers).
Please see (2112), (2637), (2681), (7629) and particularly (6656).
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