Simplest way - reboot the box.
More elegant way - scan for new luns and add them to existing configuration online.
On most of the distributions you may find rescan-scsi-bus.sh script which is responsible for triggering rescan.
Next - verify the current config - check how many luns are currently configured:
# powermt display
Symmetrix logical device count=121
CLARiiON logical device count=0
HP xp logical device count=0
Ess logical device count=0
Invista logical device count=0
=====================================================================
---- Host Bus Adapters ---- ---- I/O Paths ----- ------ Stats -----
### HW Path Summary Total Dead IO/Sec Q-IOs Errors
=====================================================================
2 lpfc optimal 242 0 - 0 0
3 lpfc optimal 242 0 - 1 0
For more detailed output you may run:
# powermt display dev=all
To detect new luns and add them to the configuration run:
# powermt config
# powermt save
# powermt display
You should now see a more luns in the output.
Additionally if you're using Veritas Storage Foundation you may scan for new disk devices by triggering:
# vxdisk scandisks new
New devices will be visible and in "error" state (you will need to initialize them later):
# vxdisk -o alldgs list
DEVICE TYPE DISK GROUP STATUS
cciss/c0d0 auto:none - - online invalid
emcpowera auto:cdsdisk - (datadg) online
emcpowerb auto:cdsdisk - (datadg) online
emcpowerc auto:cdsdisk - (datadg) online
emcpowerd auto:cdsdisk - (datadg) online
emcpowere auto:cdsdisk - (datadg) online
emcpowerf auto - - error
emcpowerg auto - - error
emcpowerh auto - - error
emcpoweri auto - - error
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