[cdwg] NFS export for Lustre 2.4.0

[Cory Spitz]

Sure.  NFS (v3) export seems to be flat broken when the MDS is at 2.4.0.  Our other issues seem to be more related to 3.x kernels or SLES 11 SP2 specific (which is a 3.0 kernel).  We haven't done a lot testing of NFS v4, but I assume that it has a all of the same problems and possibly more.

See:
LU-3550<https://jira.hpdd.intel.com/browse/LU-3550> - Stale file handle on mount when mounting Lustre 2.4 via NFS
LU-3544<https://jira.hpdd.intel.com/browse/LU-3544> - Writing to new files under NFS export from Lustre will result in ENOENT (SLES11SP2)
LU-3486<https://jira.hpdd.intel.com/browse/LU-3486> - LBUG when exporting Lustre 2.4 via NFS on SLES11SP2: ll_dops_init: ASSERTION( de->d_op == &ll_d_ops ) failed
LU-3484<https://jira.hpdd.intel.com/browse/LU-3484> - Incorrect identification of anonymous dentry as root under SLES11SP2
LU-3483<https://jira.hpdd.intel.com/browse/LU-3483> - Null pointer dereference in ll_revalidate_nd (llite/dcache.c) in an NFS mounted Lustre file system

Patrick Farrell from Cray has been working on these tickets and he may be able to chime in with more detail if you are interested.

Thanks,
-Cory

From: Nic Henke <nic_henke at xyratex.com<mailto:nic_henke at xyratex.com>>
Date: Wednesday, July 3, 2013 12:04 PM
To: Cory Spitz <spitzcor at cray.com<mailto:spitzcor at cray.com>>
Cc: "cdwg at lists.opensfs.org<mailto:cdwg at lists.opensfs.org>" <cdwg at lists.opensfs.org<mailto:cdwg at lists.opensfs.org>>
Subject: NFS export for Lustre 2.4.0

Cory - could you say more about the bugs you found in NFS exporting with Lustre 2.4 ?

Cheers,
Nic
Nicholas Henke • Senior Filesystem Developer
Xyratex
office: +1 (651)842 8471 • mobile: +1 (651)895 5795
www.xyratex.com<http://www.xyratex.com/>
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