HP Surestore Bridge FC 2/1 LV and FC 4/1 HV Installation and Operations Guide

Chapter 7 HP-UX Configuration 173
Chapter 7
1. Set the static kernel tunable parameter st_ats_enabled to OFF (0).
This can be done from the Kernel Configuration window of HP-UX system
administration tool (SAM) shown in Figure 73 and requires a kernel
rebuild and system reboot. When this parameter is enabled an implicit
SCSI reserve and release is performed during the open and close
sequence in the tape driver. This default was originally designed for ATS
services with MC/ServiceGuard. For SAN configurations, this parameter
needs to be disabled for the reasons described earlier.
Figure 73 Configurable Parameters Screen
Note When MC/ServiceGuard is enabled for ATS, the ATS services
provide a mechanism for automatically cleaning up reservations
from a second host.