Installation guide

AIX - Installation Instructions-
20 Fourth Edition 96107
StorageTek Proprietary
Identifier:5960EC86 Label:DPF_FAILOVER Text:”MAIN PATH WRAPPED TO
BACK-UP PATH” and the active I/O is switched to the good path.
Repair the failing path condition, e.g. cable, SFP transceiver, controller, or
HBA
Verify that the correct paths are restored using dpfutil listall
# Device Active Standby
hdisk1 cbx0 (fscsi0 0,0) cbx4 (fscsi1 0,0)
hdisk2 cbx1 (fscsi0 0,1) cbx5 (fscsi1 0,1)
hdisk3 cbx6 (fscsi1 0,2) cbx2 (fscsi0 0,2)
hdisk4 cbx7 (fscsi1 0,3) cbx3 (fscsi0 0,3)
This indicates that the daemon has recovered the path. The restore
daemon will redistribute the LUNs back to their preferred paths.
Single Path FAILOVER Condition while REBOOTING
If a path is failed while the host is rebooted, the following will be displayed by
the dpfutil listall command.
# Device Active Standby
hdisk1 cbx4 (fscsi1 0,0)
hdisk2 cbx5 (fscsi1 0,1)
hdisk3 cbx6 (fscsi1 0,2)
hdisk4 cbx7 (fscsi1 0,3)
Repair the failure condition, and then run the cfgmgr command.
All Paths Bad Condition without HACMP
Disconnect all the cables from controller A and B with active I/O to all LUNs.
After a few minutes the dpfutil listall command displays the
following.
# Device Active Standby
hdisk1 cbx4 (fscsi1 0,0) Fcbx0 (fscsi0 0,0)
hdisk2 cbx5 (fscsi1 0,1) Fcbx1 (fscsi0 0,1)
hdisk3 cbx6 (fscsi1 0,2) Fcbx2 (fscsi0 0,2)
hdisk4 cbx7 (fscsi1 0,3) Fcbx3 (fscsi0 0,3)
Note: The failover driver will always keep the active path as nonfailed as part
of the recovery process.
When the “all paths bad” condition has been detected for a LUN, the following
error messages are generated in the error log. You will get multiple instances
of the following message as the failover software attempts to find a good path.
Identifier:5960EC86 Label:DPF_FAILOVER Text:”MAIN PATH WRAPPED TO
BACK-UP PATH”