fdisk -l | grep -i GB | sort > prescan.txt for hst in $(ls /sys/class/scsi_host); do echo "Rescanning $hst..."; echo "- - -" > /sys/class/scsi_host/$hst/scan; done fdisk -l | grep -i GB | sort > postscan.txt diff prescan.txt postscan.txt | grep mapper
Tag Archives: LUN
Retrieving SCSI/LUN IDs from Linux /dev/sd*
Useful to identify disks present before/after a rescan of LUNs:-
for x in `ls -1 /dev/sd*`; do echo -n "$x:"; sudo /sbin/scsi_id -g $x; done > file.txt
The output is then in the format:-
/dev/sdt:360a9800044316f6f543f4646506b334d
Capture output before/after rescan of SCSI bus then use something like this to reveal the newly added LUNs (SCSI IDs):-
sdiff prescan.txt postscan.txt | grep ">" | awk '{ print $2 }' | cut -d":" -f2 | sort -n | uniq
Correlate devices and LUNs with powerpath pseudo-devices
Quick bash snippet to list powerpath pseudo-devices, LUNs and underlying devices. This takes the raw output of ‘powermt display dev-all’ and massages it into a parseable list:-
From:
Pseudo name=emcpowera Symmetrix ID=000192600720 Logical device ID=047C Device WWN=60000970000192600720533030343743 state=alive; policy=SymmOpt; queued-IOs=0 ============================================================================== --------------- Host --------------- - Stor - -- I/O Path -- -- Stats --- ### HW Path I/O Paths Interf. Mode State Q-IOs Errors ============================================================================== 3 lpfc sdadq FA 10f:00 active alive 0 0 1 lpfc sdrj FA 12f:00 active alive 0 0 0 lpfc sdaw FA 5f:00 active alive 0 0 ...
To:
emcpowera 60000970000192600720533030343743 sdadq sdrj sdaw ...
Note: the sed may need to be adjusted to to match your storage solution / HW Path.
for field in $(sudo powermt display dev=all | egrep "Pseudo|lpfc|WWN" | awk '{ print $2" "$3 }' | cut -d"=" -f2 | sed 's/lpfc //g'); do
if [[ $field = "emcpower"* ]]; then
echo -en "\n$field "
else
echo -n "$field ";
fi
done