Instance Fails to Start/Power On: "blockdev: cannot open /dev/XXX: No such device or address"

Problem

Instance fails to start or be powered on and transitions into an ERROR state with the following fault/error message: "blockdev: cannot open /dev/XXX: No such device or address".

Environment

Platform9 Managed OpenStack - All Versions
Cinder (Block Storage)
LVM
iSCSI

Cause

A stale iSCSI target/connection – one that has not been logged out promptly following the shutdown of the VM – is present and the connection information is no longer valid.

Resolution

1) Identify which iSCSI target corresponds to the unknown device (i.e. /dev/XXX).

Bash
    
xxxxxxxxxx
 
Target: iqn.2010-10.org.openstack:volume-0e173a77-46fc-4ca2-9955-0b7e534957e6 (non-flash)        Current Portal: 172.30.0.194:3260,1        Persistent Portal: 172.30.0.194:3260,1                **********                Interface:                **********                Iface Name: default                Iface Transport: tcp                Iface Initiatorname: iqn.1994-05.com.redhat:6552111637                Iface IPaddress: 172.30.0.152                Iface HWaddress: <empty>                Iface Netdev: <empty>                SID: 477                iSCSI Connection State: IN LOGIN                iSCSI Session State: FREE                Internal iscsid Session State: REOPEN...                ************************                Attached SCSI devices:                ************************                Host Number: 491 State: running                scsi491 Channel 00 Id 0 Lun: 0                Attached scsi disk sdcd State: transport-offline
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2) Logout the iSCSI target.

Bash
    
 
$ sudo iscsiadm -m node -T iqn.2010-10.org.openstack:volume-0e173a77-46fc-4ca2-9955-0b7e534957e6 -p 172.30.0.194:3260 --logoutLogging out of session [sid: 477, target: iqn.2010-10.org.openstack:volume-0e173a77-46fc-4ca2-9955-0b7e534957e6, portal: 172.30.0.194,3260]Logout of [sid: 477, target: iqn.2010-10.org.openstack:volume-0e173a77-46fc-4ca2-9955-0b7e534957e6, portal: 172.30.0.194,3260] successful.
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3) Restart or start the Instance/VM.

The 'attached scsi disk' will be followed by the device name without the preceding /dev path. For example, in the output above, the corresponding device name is sdcd.

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