[Info-vax] Finding out how many nodes have a disk mounted?

[osuvman50 at gmail.com]

Is there a robust way an application can tell if a disk volume is mounted on
multiple nodes in a cluster? The obvious things like lib$getdvi(..,
DVI$_MOUNTCNT,) don't do that. Spawning a "show device xxx" and parsing the
result doesn't fall under the category of robust.

I'm toying with adding WAL (write ahead logging) support to my SQLite port. In
unixland, WAL comes with the restriction that it doesn't work on NFS shares or
other distributed file systems because it uses shared memory to share log state
information. Disallowing WAL mode for any databases residing on disks marked 
available to the cluster in OpenVMS seems overly restrictive since the volume
may only be mounted on one node.