[Isilon] OneFS upgrade fails with Boot device mirrors are not valid message

While upgrading OneFS on a cluster, one of the nodes reports an upgrade failure. Running isi_upgrade_logs on the cluster displays a message similar to:

# isi_upgrade_logs
1  2023-11-20T21:57:10  /usr/sbin/isi_upgrade_agent_d  Warn  AgentFork:error
1  2023-11-20T21:57:10  isi_Upgrade_Agent.py  Inform  Verifying boot device mirrors are synced...
1  2023-11-20T21:57:10  isi_Upgrade_Agent.py  Inform  Traceback (most recent call last):
1  2023-11-20T21:57:10  isi_Upgrade_Agent.py  Inform    File "/usr/sbin/isi_Upgrade_Agent.py", line 687, in <module>
1  2023-11-20T21:57:10  isi_Upgrade_Agent.py  Inform      if __name__ == "__main__": main(sys.argv)
1  2023-11-20T21:57:10  isi_Upgrade_Agent.py  Inform    File "/usr/sbin/isi_Upgrade_Agent.py", line 245, in main
1  2023-11-20T21:57:10  isi_Upgrade_Agent.py  Inform      e = engine.Engine()
1  2023-11-20T21:57:10  isi_Upgrade_Agent.py  Inform    File "/usr/local/lib/python2.7/site-packages/isi/sys/update/engine.py", line 119, in __init__
1  2023-11-20T21:57:10  isi_Upgrade_Agent.py  Inform    File "/usr/local/lib/python2.7/site-packages/isi/sys/update/engine.py", line 159, in _device_init
1  2023-11-20T21:57:10  isi_Upgrade_Agent.py  Inform    File "/usr/local/lib/python2.7/site-packages/isi/sys/bootdisk.py", line 626, in init_providers
1  2023-11-20T21:57:10  isi_Upgrade_Agent.py  Inform    File "/usr/local/lib/python2.7/site-packages/isi/sys/bootdisk.py", line 2411, in verify_mirrors
1  2023-11-20T21:57:10  isi_Upgrade_Agent.py  Inform  isi.sys.bootdisk.BootdiskMirrorException: Boot device mirrors are not valid, missing components: var1

There was a problem with one of the mirror objects on the internal boot drive for the node.

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