NFSv4 delegation

[brd]

just a quick update:

no issues with NFSv4.0 (load is slowly growing, currently ~7k mailboxes)

instead, bad news from delegation front, we enabled it for a couple of
days but we ran in ugly issues: processes went in "uninterruptible
sleep" state, load average gets huge, reboot was the only escape :-(

-brd

Alessio Cecchi wrote:
> Il 12/06/2015 13:02, brd ha scritto:
> >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)
> 
> Good to know, let me know what will be when the load will grow.
> 
> >>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)
> 
> Never enabled "delegation feature" on my netapp.
> 
> Probably my issue was on client side. I had to switch immediately to NFSv3
> without being able to investigate the problem.
> 
> Ciao
> -- 
> Alessio Cecchi
> http://www.linkedin.com/in/alessice