I recently encountered an issue related to cross-version mounting of an MDT.
After an MDS crash, I rebooted the MDS and accidentally mounted an MDT that was
originally created and used with Lustre 2.15.4 using Lustre 2.16.1. After this,
I noticed that many files and directories were shown as “????” on the
client side.
I then ran lfsck on this MDT, and found that some directories that
originally belonged to this MDT disappeared entirely.
Any recommendations on how to analyze, recover, or mitigate this issue?
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