[lustre-discuss] proper procedure after MDT kernel panic

E.S. Rosenberg esr+lustre at mail.hebrew.edu
Thu Aug 11 02:42:56 PDT 2016

Hi all,
Our MDT suffered a kernel panic (which I will post separately), the OSSs
stayed alive but the MDT was out for some time while nodes still tried to
interact with lustre.

So I have several questions:
a. what happens to processes/reading writing during such an event (if they
already have handles on the OSS for instance that makes a difference)? I
noticed several of our compute-nodes ended up filling their swap/RAM so I
assume some level of caching is happening until the MDT returns....

b. what is the best/proper procedure now to ensure filesystem integrity?
Should I take the filesystem offline and run an lfsck first on the MDT then
on the OSS?

Most documents I can find with google on the subject are spread over the
various old wikis so it is not clear to me how relevant they are....

Server OS: CentOS 6.4 + lustre 2.5.3 from RPMs (1 MGS/MDS + 3 OSS)
Clients: Debian testing/unstable, kernel 4.2.8 + lustre 2.8.0 built from
Network: Infiniband FDR (o2ib)
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