HP XP P9500 Storage - Manual (Page 30)

Program name Functions
• Request path health checks and automatic failbacks
to be performed
• Collect 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 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.
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. The following figure shows the positions of the
HDLM driver and HDLM devices.
2-8
HDLM Functions
Hitachi Dynamic Link Manager User Guide for Solaris ®