About disabling the HP-UX EMS Tape Device Monitor for a SAN
You should configure the Tape Device Monitor (dm_stape) so it does not run on HP-UX hosts in a SAN configuration. The Tape Device Monitor is a component of the Event Monitoring System (EMS). The EMS service periodically polls the tape devices to monitor their conditions. When a server polls the devices while another server uses a tape device, backup operations may time out and fail.
You can avoid the situation as follows:
To disable EMS completely, run the HP-UX Hardware Monitoring Request Manager and select (K) kill (disable) Monitoring.
Invoke the Hardware Monitoring Request Manager by using the /etc/opt/resmon/lbin/monconfig command.
To configure EMS so it does not log any events or poll devices, set the POLL_INTERVAL value to 0 (zero). The POLL_INTERVAL parameter is in the following HP-UX configuration file:
/var/stm/config/tools/monitor/dm_stape.cfg
EMS runs but does not send any SCSI commands.