NetApp NFS vs. ZFS and NFS for Maildir

[Stephan von Krawczynski]

On Fri, 11 Mar 2016 11:58:00 -0300
Juan Bernhard <juan at inti.gob.ar> wrote:

> 
> El 11/03/2016 a las 11:22 a.m., Alessio Cecchi escribió:
> > Hi,
> >
> > I'm evaluating to switch from NetApp to a ZFS appliance (like Qsan). Our
> > setup is Dovecot, Maildir for email storage and NFS to share mailboxes
> > (more than 30k users) across POP/IMAP and MX servers.
> >
> > NetApp NFS works fine also under high load but have some limitation for
> > inode numbers per Volume and is expensive (but recently their prices
> > have dropped).
> >
> > ZFS, I read, suggest to create many small Raid Group to increase IOPS,
> > but this configuration (N Raid instead of one RAID-DP like NetApp) is
> > more complex to manage, or not?
> >
> > Someone has experiences with ZFS and NFS(v3) in high load environments?
> >
> > Thanks
> 
> Be careful to no do any synchronous writes under ZFS. Every sync write 
> can take up to 3 seconds of latency (under freebsd, I didnt test ZFS in 
> linux). Im using it in a 3k user environment and works great with a 4TB 
> raid 10, and dovecot cache files in a SSD disk.
> 
> Saludos, Juan.

zfs set sync=disabled ?


-- 
Regards,
Stephan