Identify Block Device of Volume Attached to Instance

Problem

The block device of an attached/mounted volume for a particular instance needs to be identified.

Environment

• Platform9 Managed OpenStack - All Versions
• Nova
• Cinder
• Libvirt

Procedure

1. Login to the KVM host.
2. Identify the disk ID within the instance's XML file.

None

# ls -l/opt/pf9/data/instances/[INSTANCE_UUID]/cfg-[INSTANCE_UUID].xml

Example:

None

/opt/pf9/data/instances/8f9dadb1-1bfa-45b9-8fed-cd53c38de547/cfg-8f9dadb1-1bfa-45b9-8fed-cd53c38de547.xml[disk type='block' device='disk'] [driver name='qemu' type='raw' cache='none' io='native'/] [source dev='/dev/disk/by-id/dm-uuid-mpath-3624a9370ebcccad586e4418c0002d81b'/]   [target dev='vda' bus='virtio'/] [serial]8837dded-d387-4b3c-a8f9-9b91f0142240[/serial] [address type='pci' domain='0x0000' bus='0x00' slot='0x04' function='0x0'/][/disk]

1. Look for the 'source dev line' for the disk id. In the above example, it is ' 3624a9370ebcccad586e4418c0002d81b.'
2. Run**lsblk** command to get all the disks and partitions.

None

# lsblk sdp 8:240 0 50G 0 disk └─3624a9370ebcccad586e4418c0002d81f 253:31 0 50G 0 mpath └─3624a9370ebcccad586e4418c0002d81f1 253:32 0 50G 0 part