HP XP P9500 Storage - Manual (Page 342)

detected path is already registered and a situation where a new HDLM device
is created.
If the SCSI device of the new path that HDLM detected is already registered,
the HDLM device mapped with the path already registered is allocated. For
example, if the path between the host and an LU of the storage system
already exists and a new path is added, the HDLM device that already exists
is allocated to the path.
If the SCSI device of the new path that HDLM detected is not yet registered,
a new HDLM device is allocated to the path. For example, if you define a new
path from the host to an LU of the storage system, a new HDLM device is
allocated to the path. The lowest available alphabetical letter is allocated as
the logical device file name of the HDLM device.
Examples of the logical device file name of the HDLM device when a new
HDLM device is allocated are shown in Table 4-5 Example: Allocation of New
HDLM Devices on page 4-46 .
Table 4-5 Example: Allocation of New HDLM Devices
Allocation before
restarting the host
Allocation after restarting the host
none /dev/sddlmaa #
/dev/sddlmaa /dev/sddlmaa
/dev/sddlmab
#
/dev/sddlmaa
/dev/sddlmab /dev/sddlmaa
/dev/sddlmab
/dev/sddlmac
#
/dev/sddlmaa
/dev/sddlmac /dev/sddlmaa
/dev/sddlmab
#
/dev/sddlmac
/dev/sddlmab
/dev/sddlmac /dev/sddlmaa #
/dev/sddlmab
/dev/sddlmac
/dev/sddlmaa
:
/dev/sddlmpp /dev/sddlmaa
:
/dev/sddlmpp
/dev/sddlmaaa
#
/dev/sddlmaa
:
/dev/sddlmaap /dev/sddlmaa
:
/dev/sddlmaap
/dev/sddlmbaa
#
#
The newly allocated logical device file name of the HDLM device
If the error message KAPL10357-E is displayed, HDLM does not add an HDLM
device even though a new LU was recognized. In this case, you must execute
the HDLM-configuration definition utility (dlmcfgmgr -u) to delete the HDLM
4-46
HDLM Operation
Hitachi Dynamic Link Manager User Guide (for Linux(R))