[lustre-discuss] missing lustre version in /proc/fs/lustre/version

[Dilger, Andreas]

On Jun 20, 2017, at 15:36, Riccardo Veraldi <Riccardo.Veraldi at cnaf.infn.it> wrote:
> 
> Hello,
> 
> I built lustre-client 2.9.59 from source as dkms package.
> Everything work fine but /proc/fs/lustre/version  disappeared while it
> was there with Lustre client 2.9.0
> is this normal ?

We've had to move a lot of Lustre parameters out of /proc/fs/lustre and into /sys/fs/lustre
for most parameter values, or /sys/kernel/debug/lustre (via debugfs) for large statistics
due to rules imposed by the upstream kernel developers.  This change has already been done
for the Lustre upstream client over a year ago.

If you use, for example, "lctl get_param version" to access this parameter and others then
the change is handled transparently.  If you are using direct access to /proc then you will
need to special-case this by version, or use a wildcard path like:

     /{proc,sys}/{fs,sys,kernel/debug}/{lustre,lnet}/
or
     {/sys/{fs,kernel/debug}/{lnet,lustre}/,/proc/{fs,sys}/{lnet,lustre}/}

Not all combinations of the above path are actually valid for all parameters, but this is a
catch-all combination that will find the various parameters.  The actual valid paths are
/proc/sys/lustre, /proc/fs/lustre, /sys/fs/lustre, /sys/kernel/debug/lustre, and similar for
lnet parameters.

Cheers, Andreas
--
Andreas Dilger
Lustre Principal Architect
Intel Corporation