I have several volumes exported from one server and mounted on several other servers. On the client systems they are mounted like so:<br />
<br />
storage-00:/rcpool/frozone/projects on /projects type nfs (rw,rsize=32768,wsize=32768,tcp,nfsvers=3,soft,intr,bg,addr=10.65.1.0)<br />
storage-00:/testing on /mnt/storage-00/testing-ext4 type nfs (rw,rsize=32768,wsize=32768,soft,intr,tcp,nfsvers=3,addr=10.65.1.0)<br />
<br />
storage-00 is my NFS server. If I leave these mounts alone for some amount of time, usually a few minutes, then try to access them I get an error:<br />
<br />
[<a href="mailto:root@frozone">root@frozone</a> mnt]$ ls /mnt/storage-00/testing-ext4<br />
ls: cannot access /mnt/storage-00/testing-ext4: Input/output error<br />
<br />
[<a href="mailto:root@frozone">root@frozone</a> mnt]$ ls /projects<br />
ls: cannot access /projects: Input/output error<br />
<br />
However, if I attempt to access them a lot, they will sometimes eventually work. After mounting/umounting several filesystems the mounts eventually stop working and no further mounts can be made, they fail with:<br />
<br />
[<a href="mailto:root@frozone">root@frozone</a> mnt]$ mount -v storage-01:/rcpool/testing storage-01/testing-zfs/ -o rw,rsize=32768,wsize=32768,soft,intr,tcp,nfsvers=3 -t nfs<br />
mount.nfs: timeout set for Tue Jan 21 15:43:50 2014<br />
mount.nfs: trying text-based options 'rsize=32768,wsize=32768,soft,intr,tcp,nfsvers=3,addr=10.65.1.1'<br />
mount.nfs: prog 100003, trying vers=3, prot=6<br />
mount.nfs: trying 10.65.1.1 prog 100003 vers 3 prot TCP port 2049<br />
mount.nfs: prog 100005, trying vers=3, prot=6<br />
mount.nfs: trying 10.65.1.1 prog 100005 vers 3 prot TCP port 57087<br />
mount.nfs: mount(2): Input/output error<br />
mount.nfs: mount system call failed<br />
<br />
Things I've tried to address this:<br />
<br />
- disabled ipv6<br />
- completely opened firewalls<br />
- tested with exports of both zfs and ext4 filesystems<br />
<br />
Other than the errors shown here, there is nothing reported in dmesg or system logs from NFS or mount. <br />
<br />
I'm happy to provide any additional troubleshooting info I can.<br />
<br />
Thanks,<br />
<br />
jbh
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