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That's it!
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Important caveats:
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* as long as the *entire* cluster is not upgraded, live migrations
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will fail with a strange error message, for example:
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Could not pre-migrate instance static-gitlab-shim.torproject.org: Failed to accept instance: Failed to start instance static-gitlab-shim.torproject.org: exited with exit code 1 (qemu-system-x86_64: -enable-kvm: unsupported machine type
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Use -machine help to list supported machines
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)
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note that you can generally migrate *to* the *newer* nodes, just
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not back to the old ones.
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a workaround for this issue is to use `failover` instead of
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`migrate`, which involves a shutdown. another workaround might be
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to upgrade qemu to backports.
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* `gnt-cluster verify` might warn about incompatible DRBD
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versions. if it's a minor version, it shouldn't matter and the
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warning can be ignored.
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### upgrade discussion
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On the other hand, the [upgrade instructions](https://sources.debian.org/src/ganeti/3.0.1-2/UPGRADE/) seem pretty confident
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