SAN
EMC Power Path on Linux
To create devices powermt config
To view devices powermt display dev=all
Check/remove devices powermt check
View paths powermt display paths
Check/repair paths/trespassed disks powermt restore
Set policy (ie CLARiiON) powermt set policy=co dev=all
Rename device emcpadm rename -s {source} -t {target}
View used devices emcpadm getusedpseudos
Release old devices powermt release
To make mappings consistent across servers in a cluster:
One one server emcpadm export_mappings -f /tmp/mappings
On every other cluster node, first check what would be changed emcpadm check_mappings -f /tmp/mappings
Then apply changes emcpadm import_mappings -f /tmp/mappings
Double-check your work emcpadm check_mappings -f /tmp/mappings
Fix Missing paths

First try: 

powermt restore

If that fails: 

/sbin/start_dev
/net/swdepot/software/scripts/rescan_luns.sh
Adding LUNs without a reboot:

Run this script: 

/net/swdepot/software/scripts/rescan_luns.sh

The above shell script performs the following steps for you: Note: you do not need to perform the following steps if you ran the shell script above. This is just for your information.

First, you need to get the HBA’s to issue a LIP and then a re-scan 

echo 1 > /sys/class/fc_host/{host#}/issue_lip 
echo "- - -" > /sys/class/scsi_host/{host#}/scan

Do this for every host path (usually just 'host0' and 'host1')

Now you just need to tell Power Path to go do its normal discovery 

powermt config

If you do a display, you should see the new LUN. 

powermt display dev=all