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Openstack / Migrate Volume To New Host

Migrate Volume To New Host

Migrates a volume to a new host in an OpenStack environment.

$
Terminal
openstack volume migrate --host <host_hostname> <instance_id>

When To Use

During a host failure where live migration is not feasible and downtime must be minimized for volume availability.

Pro Tip

Use the --block-migrate flag for volumes that support it. This avoids data transfer interruptions during migration.

Command Builder

Tune the command before you copy it

Back to syntax
$
Generated Command
openstack volume migrate --host <host_hostname> <instance_id>

Anatomy of Output

Understanding the result

Migrating volume 'volume-123' to new host 'example-hostname.com'... Migration Status

Indicates what volume is being migrated and to which host.

Migration started. Status

Signals the initiation of migration process.

Migration completed successfully. Final Status

Confirms the successful migration of the volume.

Troubleshooting

Common pitfalls

Error: Volume 'volume-123' is not in an available state for migration.

Solution: Ensure volume is in 'available' state by checking with `openstack volume show volume-123`.

Error: Unable to migrate to host 'example-hostname.com': insufficient resources.

Solution: Check host capacity and resource availability using `openstack host show example-hostname.com`.

Error: Volume cannot be migrated while attached to instance 'instance-456'.

Solution: Detach volume from instance with `openstack server remove volume instance-456 volume-123` before migration.

Command Breakdown

What each part is doing

openstack
Base Command
The executable that performs this operation. Here it runs Openstack before the shell applies any redirect operators.
<host_hostname>
host hostname
The host or server name supplied to this command.
<instance_id>
instance id
The value supplied for instance id.
--host
Command Option
Tool-specific option used by this command invocation.

Alternative Approaches

Comparable commands in other tools

Alternative cloud infrastructure tools for the same job.