Chapter 7 Changing the Multipath Configuration (FC/FCoE Connection for RHEL6, RHEL7, or SLES11)
7.4 LU Reduction
FUJITSU Storage ETERNUS Multipath Driver V2 User’s Guide for Linux
Copyright 2014 FUJITSU LIMITED
P2U3-0031-15ENZ0
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7.4
LU Reduction
7.4.1
Reduction without Server Rebooting
Using the "mpdconfig" command, LUs can be removed without shutting down the server. Use the following
procedure.
Procedure
1
Remove the LUs.
Perform LU reduction in the storage system (release the LU configuration so that the server does not
recognize the LU). Refer to the storage system manual for LU reduction details.
2
Delete the removed LUs from the Multipath Driver target list using the "mpdconfig -d"
command.
[Example]
3
Use the "iompadm info" command to check that the removed LUs have disappeared from
view.
[Example]
End of procedure
•
When removing the LUs without server rebooting, completely halt all access to the LUs that are to be
removed. If access cannot be halted, follow the procedures described in
.
•
For storage systems other than the ETERNUS DX S2 series, ETERNUS DX S3 series, or ETERNUS All Flash
Array, never attempt to remove LU0.
# /opt/FJSVmpd/bin/mpdconfig -d
# /opt/FJSVmpd/bin/iompadm info
If SCSI disks are accessed using sd* device names, discrepancies will occur for the device names
according to the number of deleted LUs when the server is restarted after deleting LUs. Alter the OS
and application settings as necessary.
If by-id names are used, this problem does not occur.
