[CentOS] nfs v3 issues on Centos 7

Tue Feb 16 13:35:48 UTC 2016
Edsall, William (WJ) <WJEdsall at dow.com>

Hello list,
So I'm having a strange issue with Centos 7 mounting NFS V3.

It starts with autofs. For example, my auto.share file:
apps    -nfsvers=3 some-server:/mnt/xfs1/&

This will mount, but the first mount takes ~30 sec. After this, eventually the mount becomes stale but it still shows as connected in 'mount'.

At this point, I can no longer mount NFS shares. Manual mounting example shown below.

Any feedback would be appreciated - thank you!

CentOS Linux release 7.1.1503 (Core)

mount -t nfs -o vers=3 mdstor:/mnt/xfs1/apps tmpx -v
mount.nfs: timeout set for Tue Feb 16 08:33:31 2016
mount.nfs: trying text-based options 'vers=3,addr='
mount.nfs: prog 100003, trying vers=3, prot=6
mount.nfs: trying prog 100003 vers 3 prot TCP port 2049
mount.nfs: prog 100005, trying vers=3, prot=17
mount.nfs: trying prog 100005 vers 3 prot UDP port 892
mount.nfs: mount(2): Input/output error
mount.nfs: mount system call failed