Chapter 4 Changing the Multipath Configuration (FC/FCoE Connection for RHEL-AS4, RHEL-ES4, RHEL5, SLES9, or SLES10)
4.4 Path Reduction (Cable Reduction)
FUJITSU Storage ETERNUS Multipath Driver V2 User’s Guide for Linux
Copyright 2014 FUJITSU LIMITED
P2U3-0031-15ENZ0
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4.4
Path Reduction (Cable Reduction)
This section describes how to decrease the paths by removing cables.
4.4.1
Reduction without Server Rebooting
Using the "mpdconfig" command, cables can be removed without shutting down the server. Use the following
procedure.
Procedure
1
Detach the hardware.
Disconnect the target cable from the server (remove the connected cable, etc.).
2
Delete the removed cable from the Multipath Driver target list using the "mpdconfig -d"
command.
[Example]
3
Use the "iompadm info" command to check that the removed cable has disappeared from
view.
[Example]
4
Reset the Max Throttle value if necessary.
When the number of paths connected to a given CA port in the storage system is reduced due to the
path removal, execute the "mpdconfig -m" command to set the Max Throttle value correctly. Refer to
the software information (/opt/FJSVmpd/manual/english/readme.pdf) for the Max Throttle value
computation method.
End of procedure
Red Hat Enterprise Linux AS v.4, Red Hat Enterprise Linux ES v.4, and SUSE Linux Enterprise Server 9 require
the server be rebooted for cable reduction.
# /opt/FJSVmpd/bin/mpdconfig -d
# /opt/FJSVmpd/bin/iompadm info
