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155Administering dynamic multipathing (DMP)
Administering DMP using vxdmpadm
For a system with a volume mirrored across 2 controllers on one HBA, set up the
configuration as follows:
1 Disable the plex that is associated with the disk device:
# /opt/VRTS/bin/vxplex -g diskgroup det plex
2 Stop I/O to all disks through one controller of the HBA:
# /opt/VRTS/bin/vxdmpadm disable ctlr=first_cntlr
For the other controller on the HBA, enter:
# /opt/VRTS/bin/vxdmpadm -f disable ctlr=second_cntlr
3 Upgrade the firmware on those disks for which the controllers have been
disabled using the procedures that you obtained from the disk drive vendor.
4 After doing the upgrade, re-enable all the controllers:
# /opt/VRTS/bin/vxdmpadm enable ctlr=first_cntlr
# /opt/VRTS/bin/vxdmpadm enable ctlr=second_cntlr
5 Re-enable the plex associated with the device:
# /opt/VRTS/bin/vxplex -g diskgroup att volume plex
This command takes some time depending upon the size of the mirror set.
Renaming an enclosure
The vxdmpadm setattr command can be used to assign a meaningful name to an
existing enclosure, for example:
# vxdmpadm setattr enclosure enc0 name=GRP1
This example changes the name of an enclosure from enc0 to GRP1.
Note: The maximum length of the enclosure name prefix is 25 characters. The
name must not contain an underbar character (_).
The following command shows the changed name:
# vxdmpadm listenclosure all
ENCLR_NAME ENCLR_TYPE ENCLR_SNO STATUS
============================================================
other0 OTHER OTHER_DISKS CONNECTED
jbod0 X1 X1_DISKS CONNECTED
GRP1 ACME 60020f20000001a90000 CONNECTED