storage vmotion -risk

Is storage Vmotion a safe operation? I have to move several VMs to different datastore, and I was wondering how to do it(clone, Storage vmotion with running server, or Storage Vmotion with power off server).  Have you got any problems with storage Vmotion in the past?
dedriAsked:
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Subhashish LahaCommented:
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Andrew Hancock (VMware vExpert / EE MVE^2)VMware and Virtualization ConsultantCommented:
I would always recommend ensuring that you have valid Full Backups, not VMware Snapshots before attempting any datastore migration.

also test a small VM first to check your storage and network are up to Storage vMotion.

Also remove all snapshots if any from virtual machines, as moving VMs with Snapshots is not supported.

But it is a safe operation, but as it uses Snapshot to move, I would recommend, performing out of hours, or during a quiet period for the VM.
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