NFSv4 delegation

[brd]

Alessio Cecchi wrote:
[...]
> Have you already try to run NFSv4?
it's in place on a (very) small sample of mailboxes in dbox format, no issues
up to now (Debian Wheezy mainline kernel)

> When we switch to netapp and nfsv4 we had many problems (lock problems
> and instability) and we had to go immediately to NFSv3. I don't know if
> was a netapp problem or nfs client (Debian with 2.6 kernel), now we are
> using Centos 6 as NFS client and we should re-try to mount mailbox as nfsv4.

when you've had problems, the "delegation feature" was active on Netapp
filers? (AFAIK it is disabled by default)

you had a look here for known bugs?
https://kb.netapp.com/support/index?id=3014338&page=content

ciao
-brd