HP XP P9500 Storage - Manual (Page 29)

Program name Functions
• Migration of HDLM
• Clear HDLM persistent reservation
• Exclude the hdisk recognized as a boot disk from
being an HDLM management target
• Set ODM to define HDLM operations
• Delete hdisks according to the parameter settings
• Install HDLM
• The unattended installation of HDLM
• Install Hitachi Command Suite Common Agent
Component
• Collect information about errors that occur during
HDLM installation
• Perform maintenance when HDLM-managed devices
are restored
HDLM manager Provides the HDLM manager, which enables you to:
•
Configures the HDLM operating environment
• Request path health checks and automatic failbacks
to be performed
• Collects error log data
HDLM alert driver Reports the log information collected by the HDLM driver
to the HDLM manager. The driver name is dlmadrv.
HDLM driver Controls HDLM functionality, manages paths, and detects
errors. This is an add-in module of the AIX MPIO driver.
The HDLM driver consists of the following:
•
Core logic component
Controls the basic functionality of HDLM.
• Filter component
Sends and receives I/O data.
HDLM configuration log
driver
Acquires operation logs of the configuration processing for
the HDLM driver.
Position of the HDLM Driver and hdisk
The HDLM driver is positioned above the SCSI driver and is an add-in module
of MPIO driver located in the AIX standard hdisk. Each application on the host
uses the hdisk (logical device file) created by HDLM, to access LUs in the
storage system. The following figure shows the position of the HDLM driver
and hdisk. The logical device file name can be changed by using the rendev
command. In this manual, the file name of a default logical device of the OS
(hdiskn) or an hdisk name is used as the logical device file name.
HDLM Functions
2-7
Hitachi Dynamic Link Manager User Guide for AIX ®