Veritas Volume Manager 5.1 SP1 Administrator"s Guide (5900-1506, April 2011)

Table 15-2
DMP parameters that are tunable (continued)
DescriptionParameter
Determines whether the Event Source daemon
(vxesd) uses the Storage Networking Industry
Association (SNIA) HBA API. This API allows DDL to
improve the performance of failover by collecting
information about the SAN topology and by
monitoring fabric events.
If this parameter is set to on, DDL uses the SNIA HBA
API. (Note that the HBA vendor specific HBA-API
library should be available to use this feature.)
If this parameter is set to off, the SNIA HBA API is
not used.
The default setting is off for releases before 5.0 that
have been patched to support this DDL feature. The
default setting is on for 5.0 and later releases.
dmp_monitor_fabric
Determines whether the Event Source daemon
(vxesd) monitors operating system events such as
reconfiguration operations.
If this parameter is set to on, vxesd monitors
operations such as attaching operating system
devices.
If this parameter is set to off, vxesd does not
monitor operating system operations. When DMP
co-exists with EMC PowerPath, Symantec recommends
setting this parameter to off to avoid any issues.
The default setting is on, unless EMC PowerPath is
installed. If you install DMP on a system that already
has PowerPath installed, DMP sets the
dmp_monitor_osevent to off.
dmp_monitor_osevent
Determines whether DMP will do multi-pathing for
native devices.
Set the tunable to on to have DMP do multi-pathing
for native devices.
When a Storage Foundation product is installed, the
default value is off.
When Veritas Dynamic Multi-Pathing is installed, the
default value is on.
dmp_native_support
507Performance monitoring and tuning
Tuning VxVM