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Old 12-06-2015, 10:01 AM   #1
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using "noac" option with auto mounting

Hi -

I have a piece of software and due to the way it writes to file on a node in combination with my NFS3 filesystem, I need to use the noac option when mounting (i have verified this with the developer). Without noac you get the following error with the code:

"File locking failed in ADIOI_Set_lock(fd A,cmd F_SETLKW/7,type F_WRLCK/1,whence 0) with return value FFFFFFFF and errno 25.

- If the file system is NFS, you need to use NFS version 3, ensure that the lockd daemon is running on all the machines, and mount the directory with the 'noac' option (no attribute caching)."

I am running rocks-6.6.1 and so am using auto mounting where /exports/home becomes /home. My auto.home has entries that look like:

username -nfsvers=3 cluster.local:/export/home/username

I have tried many many different ways of including noac in either fstab or in auto.home (or both). If i modify fstab, say as follows:

UUID=0aae37b6-bd24-423c-9088-d5afe5b5b30a /export ext4 rw,noac 1 2

then it can't mount /home. (I get warning: cannot change directory to /home/xxxx: No such file or directory)

If i modify auto.home as follows:

username -nfsvers=3,noac cluster.local:/export/home/username

OR do

username -nfsvers=3 rw,noac cluster.local:/export/home/username

and then remount, and export to a node, then it seems to kind of work, as i can cat /mtab and get the following:

[root@compute-0-0 ~]# cat /etc/mtab
/dev/sda1 / ext4 rw 0 0
proc /proc proc rw 0 0
sysfs /sys sysfs rw 0 0
devpts /dev/pts devpts rw,gid=5,mode=620 0 0
tmpfs /dev/shm tmpfs rw 0 0
/dev/sda5 /scratch ext4 rw 0 0
/dev/sda3 /var ext4 rw 0 0
none /proc/sys/fs/binfmt_misc binfmt_misc rw 0 0
sunrpc /var/lib/nfs/rpc_pipefs rpc_pipefs rw 0 0
poppy.local:/export/home/auclark /home/auclark nfs
rw,nfsvers=3,noac,sloppy,addr= 0 0
poppy.local:/export/apps /share/apps nfs
rw,vers=4,addr=,clientaddr= 0 0

but you will note that for the user auclark there is this "nfsvers=3,noac,sloppy" output....its the sloppy I am concerned about. Indeed, if this user tries to use the software that needs noac, then the same errors occur - with the "File locking failed" i think that the "sloppy" means that the noac option really didn't take during the export.

Can anyone else point me in a right direction for the correct way that noac should be implemented when you use auto mounting?


Old 12-08-2015, 09:45 AM   #2
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Registered: Dec 2011
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I know vers=3 option that compatible with the Sun Microsystems automounter.
Don't know if nfsvers=3 works - if not, then the sloppy option will ignore it and proceed with the mount with all other options.

You can put an option in each line in auto.home like you did
username  -vers=3,rw,noac  cluster.local:/export/home/username
Or put it as a map option in auto.master
/home  auto.home  -vers=3,rw,noac
(can be overridden by the options in auto.home)
If you can do simple NFS operations like reading or writing to a file,
and your problem is only with file locking, then check with
rpcinfo -p
rpcinfo -p cluster.local
that nlockmgr protocol is active.
Normally it is the lockd and statd processes that provide the nlockmgr service.


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