[Dovecot] Clustering dovecot?

[Noel Butler]

On Wed, 2009-05-27 at 21:47 -0400, dovecot at corwyn.net wrote:

> At 04:21 PM 5/27/2009, you wrote:
> >On Wed, 2009-05-27 at 14:02 -0400, dovecot at corwyn.net wrote:
> >yes, and use NAS  not SAN
> 
> Why NAS and not SAN?
> 

Because the two technologies differ and it permits you to run non
clustering FS's,  remember, SAN is block device, so it can only do one
single write operation at a time, NAS, as many as you can throw at it,
each has its own pros and cons, for mail NAS is perfect, for databases,
SAN is better.


> >you could also use DNS load balancing in a away that has  0 cache TTL on
> >MX addresses, thats better than a software based LB if you cant afford a
> >hardware LB 
> I'm not sure I understand that. The MX records have little to do with


Your correct (too early in the morning when I sent that) but the same
applies, if its for redundancy set 0 in DNS record for the hosts so if
one fails, retrying has a better chance of getting the alive one, if you
are that worried about it, get yourself a hardware solution, there are
plenty around and cheap enough these days.