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Chapter 3 Multipath Driver Functions and Operation
3.5 Disconnecting/Reconnecting Paths when Replacing Hardware
3.5
Disconnecting/Reconnecting Paths when Replacing
Hardware
When performing maintenance, you can disconnect and/or reconnect a specified path using the "iompadm"
command.
3.5.1
"iompadm change" Command
Use the "iompadm change" command to change a path's status to stop.
[Command format]
iompadm change [change_unit] disk_device_node port_number
When "adapter" is specified as the change unit, the following is also available:
iompadm change adapter PCI_bus_number
[Function overview]
This command is used in preparation for hardware hot replacement. It disconnects all paths that use the
target hardware (specified by change unit, disk device node, and port number), and stops any I/O
processes. If a change unit is not specified, the process is performed as if "controller" had been specified.
Disk device node and port number can be checked from the output result of the "iompadm info" command.
This command changes an active, standby, or warning status path to stop status. This command cannot
change a fail or fatal fail status path to stop status.
[Example]
# /opt/FJSVmpd/bin/iompadm change controller /dev/sdb 30
[Change unit specification]
Table 3.4
adapter (a)
controller (c) (default)
controllerunit (cu)
groupmodule (g)
Details of the relationship between change units and storage systems 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/
Change unit specification
Use this when replacing a cable between an HBA and Switch or SFP connected to
the cable.
Use this when replacing a cable directly connecting an HBA and CA, or a cable
between a CA and Switch, or a SFP connected to the cable.
Use this when replacing a Channel Adapter.
Use this when replacing a group module.
FUJITSU Storage ETERNUS Multipath Driver V2 User's Guide for Linux
Copyright 2014 FUJITSU LIMITED
51
P2U3-0031-15ENZ0
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