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Grizzly to Juno volume migration

Hi.

Right now I have multinode Grizzly installation with a lot of volumes spreaded across 3 Cinder nodes. But I'm planning to migrate to Juno release (fresh install on other physical servers, not upgrading existing ones), so I have to migrate all my volumes (tgt and iscsiadm is used to manage them).

Is there any scenario or guide I can use to make such migration and avoid data loss? Upgrading existing nodes is a bit complicated because Grizzly installation was performed by another system administrator and he is not available anymore.

Or maybe there is a way to upgrade these 3 Cinder nodes to Juno release and integrate them into fresh installation?

Thx in advance.

Grizzly to Juno volume migration

Hi.

Right now I have multinode Grizzly installation with a lot of volumes spreaded across 3 Cinder nodes. But I'm planning to migrate to Juno release (fresh install on other physical servers, not upgrading existing ones), ones) so I have to migrate all my volumes (tgt and iscsiadm is used to manage them).

Is there any scenario or guide I can use to make such migration and avoid data loss? Upgrading existing nodes is a bit complicated because Grizzly installation was performed by another system administrator and he is not available anymore.

Or maybe there is a way to upgrade these 3 Cinder nodes to Juno release and integrate them into fresh installation?

Thx in advance.