[lustre-discuss] Full OST, any way of avoiding it without hanging?

Jason Williams jasonw at jhu.edu
Sat Jan 5 18:49:24 PST 2019


We have a lustre system (version 2.10.4) that has unfortunately fallen victim to a 100% full OST... Every time we clear some space on it, the system fills it right back up again.

I have looked around the internet and found you can disable an OST, but when I have tried that, any writes (including deletes) to the OST hang the clients indefinitely.  Does anyone know a way to make an OST basically "read-only" with the exception of deletes so we can work to clear out the OST?  Or better yet, a way to "drain" or move files off an OST with a script (keeping in mind it might not be known if the files are in use at the time).  Or even a way to tell lustre "Hey don't write any new data here, but reading and removing data is OK."

Jason Williams
Assistant Director
Systems and Data Center Operations.
Maryland Advanced Research Computing Center (MARCC)
Johns Hopkins University
jasonw at jhu.edu<mailto:jasonw at jhu.edu>

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