Director+NFS Experiences

[Mark Moseley]

On Fri, Feb 24, 2017 at 11:41 AM, Francisco Wagner C. Freire <
wgrcunha at gmail.com> wrote:

> In our experience. A ring with more of 4 servers is bad, we have sync
> problems everyone.  Using 4 or less works perfect.
>
> Em 24 de fev de 2017 4:30 PM, "Mark Moseley" <moseleymark at gmail.com>
> escreveu:
>
>> >
>> > On Thu, Feb 23, 2017 at 3:15 PM, Timo Sirainen <tss at iki.fi> wrote:
>> >
>> >> On 24 Feb 2017, at 0.08, Mark Moseley <moseleymark at gmail.com> wrote:
>> >> >
>> >> > As someone who is about to begin the process of moving from maildir
>> to
>> >> > mdbox on NFS (and therefore just about to start the
>> 'director-ization'
>> >> of
>> >> > everything) for ~6.5m mailboxes, I'm curious if anyone can share any
>> >> > experiences with it. The list is surprisingly quiet about this
>> subject,
>> >> and
>> >> > articles on google are mainly just about setting director up. I've
>> yet
>> >> to
>> >> > stumble across an article about someone's experiences with it.
>> >> >
>> >> > * How big of a director cluster do you use? I'm going to have
>> millions
>> >> of
>> >> > mailboxes behind 10 directors.
>> >>
>> >> I wouldn't use more than 10.
>> >>
>> >>
>> > Cool
>>
>
Interesting. That's good feedback. One of the things I wondered about is
whether it'd be better to deploy a 10-node ring or split it into 2x 5-node
rings. Sounds like splitting it up might not be a bad idea. How often would
you see those sync problems (and were they the same errors as I posted or
something else)? And were you running poolmon from every node when you were
seeing sync errors?