Description of problem:
failure doing a scaling out of ceph node.
the deployment show the following error on ironic-conductor logs:

ERROR ironic.conductor.utils [req-ce122274-9557-446c-bf1a-0e08cf8e436c - - - - -] Failed to install a bootloader when deploying node xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxxx. Error: {'type': 'CommandExecutionError', 'code': 500, 'message': "Command execution failed: Installing GRUB2 boot loader to device /dev/sdr failed with Unexpected error while running command.\nCommand: mount /dev/sdr3 /tmp/tmp63ht2umu\nExit code: 32\nStdout: ''\nStderr: 'mount: /tmp/tmp63ht2umu: /dev/sdr3 already mounted on /tmp/tmp63ht2umu.\\n'.", 'details': "Installing GRUB2 boot loader to device /dev/sdr failed with Unexpected error while running command.\nCommand: mount /dev/sdr3 /tmp/tmp63ht2umu\nExit code: 32\nStdout: ''\nStderr: 'mount: /tmp/tmp63ht2umu: /dev/sdr3 already mounted on /tmp/tmp63ht2umu.\\n'."}


Version-Release number of selected component (if applicable):
OSP 16.2.3


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