bi...@dev-ops.pl:
> W dniu 2015-11-27 16:52, wie...@porcupine.org napisa?(a):
> > Wietse Venema:
> >> Django [BOfH]:
> >> > Via clusterfs Klaus may share /var/lib/postfix/cachepool between all 4
> >> > MX.
> >>
> >> LMDB Postfix caches support sharing; non-LMDB caches cannot be
> >> shared at all.
> >
> > To be precise: LMDB Postfix caches support shared access by readers
> > and writers. Other caches cannot be shared by writers or by
> > readers+writers. Read-only sharing is OK, but irrelevant for caches.
> >
> >> However, the Postfix LMDB client requires fcntl locks. If clusterfs
> >> does not support fcntl locks, then things will blow up. If fcntl
> >> performance sucks, use memcache without persistent backup.
> >>
> >> Wietse
> >>
>
> We use couchbase cluster with memcached buckets to share postscreen
> cache between cluster of postfix machines. We you use Couchbase , then
> you run a proxy application to your bucket called moxi. It gives you one
> common memcached shared between all postfix machines in cluster without
> connecting them together, you only use moxi - proxy application to your
> single memcache bucket.
What is the latency for looking up information that is NOT in the
memcache? If it is 10 millseconds, then postscreen can handle only
100 connections per second, and it becomes a performance bottleneck.
Wietse
