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The Question is:
Hi Wizards,
I'm trying to describe to a customer what the 'lock count' is on a $show
cluster and haven't really found any detailed info other than it's a count of
the ENQ/DEQ activity. What *is* ENQ/DEQ activity?
thanks!
The Answer is :
The OpenVMS Wizard does have some difficulties with guessing what tool
or command(s) are referenced, and would thus strongly encourage that
any question provide the specific command(s) used -- please see the
posting rules for the information that the OpenVMS Wizard requires.
The DCL command SHOW CLUSTER does not display locking statistics.
The MONITOR command does, but it doesn't have a display "lock count".
ANALYZE/SYSTEM (SDA) does display various OpenVMS Galaxy lock counts,
but these displays do not exist on OpenVMS Alpha V7.1. SDA also has
some displays of lock counts in the area of RMS.
To answer your question about ENQ/DEQ activity: $ENQ is the OpenVMS
system service that is used to enqueue a lock request. $DEQ is the
service that dequeues a lock request. "Lock count", therefore, is
presumably the rate at which $ENQ or $DEQ requests are taking place.
Locks are a software construct that are used to provide synchronized
access to arbitrary objects -- disks, files, records, applications,
processes, even integers or other 16-byte values -- referenced throughout
an OpenVMS cluster. For more information on locks, please start with
section 2.6 of the OpenVMS Cluster Systems Manual, at:
www.openvms.compaq.com:8000/72final/4477/4477pro_003.html#lockman_map
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