Chapter 3 Multipath Driver Functions and Operation
3.3 Identifying Disks and Paths
FUJITSU Storage ETERNUS Multipath Driver V2 User’s Guide for Linux
Copyright 2014 FUJITSU LIMITED
P2U3-0031-15ENZ0
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3.3
Identifying Disks and Paths
3.3.1
Device Identification
A storage system Logical Unit (LU) in a multipath configuration can be recognized by the Multipath Driver
using the "iompadm info" command.
Example:
Table 3.3 Device identification example
The above information allows you to confirm the connected storage system and the recognized LUN_Vs.
3.3.2
Path Identification
Path connections and status between the Multipath Driver and the storage system can be monitored using
the "iompadm info" command. In the following example, the path identifier has been outlined.
Example:
The 3rd number is called the port number.
Details of the port numbers (CAID) of each storage system model and their connections are provided in the
"FUJITSU Storage ETERNUS Multipath Driver V2 (for Linux) Installation Information" found under "Downloads"
at the following URL:
http://www.fujitsu.com/global/products/computing/storage/software/eternus-mpd/
Disk ID segment
Description
Storage system name
The model name of the connected storage system
Serial number/Device identification no.
Unique serial number ID or Device identification no. of the connected
storage system
Magic code
Used by the Multipath Driver for internal control
LUN_V
LUN_V of the logical unit
DISK: ETERNUS_DXL- 130011-0000-0000 (sdb)
LUN_V
Magic code
Serial number/Device identification no.
Storage system name
DISK: ETERNUS_DXL- 130011-0000-0000 (sdb)
PATH:
sdb 0000:03:04.0 active "online" 10, 10, 0 <- path identifier
sdb 0000:03.05.0 standby "online" 11, 11, 2
