Position Of The Hdlm Driver And Hdlm Device - Hitachi XP P9500 User Manual

HDLM alert driver
HDLM driver

Position of the HDLM Driver and HDLM Device

The HDLM driver is positioned above the SCSI driver. Each application on the
host uses the HDLM device (logical device file) created by HDLM, to access
LUs in the storage system.
Figure 2-4 Position of the HDLM Driver and HDLM Devices on page 2-9
shows the position of the HDLM driver and HDLM devices.
2-8
Program name
HDLM Functions
Hitachi Dynamic Link Manager User Guide (for Solaris(R))
• Configure the HDLM operating environment
• Request path health checks and automatic failbacks
to be performed
• Collect error log data
Reports the log information collected by the HDLM driver
to the HDLM manager. The driver name is dlmadrv.
Controls all the HDLM functions, manages paths, and
detects errors. The HDLM driver consists of the following:
• Core logic component
Controls the basic functionality of HDLM.
• Filter component
Sends and receives I/O data. The driver name is
dlmfdrv.
• HDLM nexus driver
Performs operations such as reserving controller
numbers for logical device files of the HDLM device,
and managing HDLM driver instances for each HBA
port. The driver name is dlmndrv.
Functions