Linux - Multipath

Install

Install package:

yum install device-mapper-multipath

Commands

Multipath

List paths:

multipath -ll

Rescan paths:

# BEFORE: Scan path
rescan-scsi-bus.sh (-i)

# Scan
multipath

# Add verbosity
multipath -v3

# Force devmap reload
multipath -r

Clean paths:

multipath -F

Multipathd

Start interactive shell:

multipathd -k

Delete path:

multipathd -f {path}

Procedures

Resize volume

Get path of device:

multipath -ll mpatha

Rescan paths:

echo "1" > '/sys/class/block/sdb/device/rescan'
echo "1" > '/sys/class/block/sdd/device/rescan'

Reload multipath config:

multipath -F
multipath -v2 mpatha

Resize map:

multipathd -k"resize map mpatha" -vv

Resize volume:

pvresize /dev/mapper/mpatha