Hitachi Dynamic Link Manager Software Users Guide for Linux

Program name Functions
• Configure the HDLM operating environment
• 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 sddlmadrv.
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
sddlmfdrv.
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 position of the HDLM driver and HDLM device.
2-10
HDLM Functions
Hitachi Dynamic Link Manager (for Linux®) User Guide