Hi,

I have a FAS2240 and used it as an NFSv4 storage for our Linux KVM-based cloud. Few days ago, I noticed a few NFS mounts freezing up. After some investigation, looks like the Linux clients are attempting to get access to files via NFS share and the Netapp appears to be denying it. It appears to happen at random across multiple clients as if we hit some kind of a wall.

I found a "lock status -v" command by going to some posts on the internet and after running it, the last line shows the following:

Free owners 7; In-Use Owners 8185

Could that be the wall/limitation that's causing my problem? I also learned of a bug in older Linux kernel that creates extra owners and found the client that appeared to have a huge amount of file locks and owners generated. After disconnecting the client and clearing the locks it didn't seem to make a difference.

Here is some extra summary from the "lock status -n" command:

CIFS: 13 share locks, 0 byte locks NLM: 0 share locks, 1 byte locks NFSV4: 47 share locks, 0 byte locks WAFL: 0 share locks, 0 byte locks TEST: 0 share locks, 0 byte locks FIO: 0 share locks, 0 byte locks FlexCache: 0 share locks, 0 byte locks NG: 0 share locks, 0 byte locks Total Locks: 60 share locks, 1 byte locks Max Locks: 2922432 Total Locked Files: 56 Max Locked Files: 1461216

Any help would be greatly appreciated.