Hi, David.

Answers inline.

On Fri, May 17, 2019 at 11:42 AM David C <dcsysengineer@gmail.com> wrote:
>
> Hi All
>
> I recently put an nfs-ganesha CEPH_FSAL deployment into production, so far so good but I'm seeing some errors in the logs I didn't see when testing and was hoping someone could shed some light on what they mean. I haven't had any adverse behaviour reported from the clients (apart from a potential issue with slow 'ls' operations which I'm investigating).
>
> Versions:
>
> libcephfs2-13.2.2-0.el7.x86_64
> nfs-ganesha-2.7.1-0.1.el7.x86_64
> nfs-ganesha-ceph-2.7.1-0.1.el7.x86_64
> Ceph cluster is 12.2.10
>
> Log errors:
>
>> "posix2fsal_error :FSAL :INFO :Mapping 11 to ERR_FSAL_DELAY"

This is an INFO, so it's not an error.  You might not want to run a
production deployment at INFO, because it will be a bit chatty.  The
default is to run at EVENT.

>
>
> I'm seeing this one frequently although seems to spam the log with 20 or so occurrences in a second.
>
>> "15/05/2019 18:27:01 : epoch 5cd99ef1 : nfsserver : ganesha.nfsd-1990[svc_1653] posix2fsal_error :FSAL :INFO :Mapping 5 to ERR_FSAL_IO, rlim_cur=1048576 rlim_max=1048576
>> 15/05/2019 18:27:01 : epoch 5cd99ef1 : nfsserver : ganesha.nfsd-1990[svc_1653] nfs4_Errno_verbose :NFS4 :CRIT :Error I/O error in nfs4_mds_putfh converted to NFS4ERR_IO but was set non-retryable"

The IO error log is there because NFS4ERR_IO is a catchall error,
that's used for lots and lots of situations.  When a client sees
NFS4ERR_IO, it can be really hard to know what caused the error.  This
one has traditionally been a CRIT message.  I think that's high, I
would put it at WARN, but that's the way it is.  Something *did* go
wrong, but not in Ganesha, there was some error in the underlying FS,
and it was returned to the client.

>
>
> I've only seen a few occurrences of this one
>
>> 17/05/2019 15:34:24 : epoch 5cdd9df8 : nfsserver : ganesha.nfsd-4696[svc_258] xdr_encode_nfs4_princ :ID MAPPER :INFO :nfs4_gid_to_name failed with code -2.
>> 17/05/2019 15:34:24 : epoch 5cdd9df8 : nfsserver : ganesha.nfsd-4696[svc_258] xdr_encode_nfs4_princ :ID MAPPER :INFO :Lookup for 1664 failed, using numeric group

These, again, are INFO, and so don't indicate a true failure anywhere.

>
>
> This one doesn't seem too serious, my guess is there are accounts on the clients with gids/uids that the server can't look up. The server is using SSSD to bind to AD if that helps.

Correct.

Daniel