According our SAN partner, it is impossible mount a same volume
with read/write permission in two machines. So it is necessary a
middle level, based in network file systems (NFS, GFS, etc.). We know
that there are installations with GFS but googling we found the
following link:
http://www.redhat.com/archives/linux-cluster/2005-September/msg00220.html
Any good/bad experiences about GFS and QMAL? Is a good mix?
Thanks.
El vie, 24-11-2006 a las 02:34 -0800, Mihai Costache escribió:
>
> why you don't use a 2 identical qmail-ldap hosts ? and this two qmail hosts
> behind f5 balancer ?
>
> and you have a single SAN partition ... and this partition is mounted on each
> qmail-ldap machine (configuration of this qmail-ldap
> hosts are identical)
>
> in this case the email are stock on the same SAN partition, regardless of
> qmail-ldap hosts
>
> also the pop3 use the maildir on SAN partition regardless of qmail-ldap hosts
>
>
>
>
>
> ----- Original Message ----
> From: Antonio Guirado Puerta <antonio.guirado@f-integra.org>
> To: qmail-ldap@qmail-ldap.org
> Cc: carlos.garcia@f-integra.org
> Sent: Thursday, November 23, 2006 12:17:50 PM
> Subject: QMAIL CLUSTER with BACKUP
>
> Hello,
>
> We are evaluating qmail-ldap for an ISP installation.
> We need a qmail cluster situated behind a F5 balancer.
> We are going to distribute domains between two different
> qmail instances situated in different machines (p.e mx1.domain.com
> and mx2.domain.com).
>
> Maildirs are on a two SAN partitions. Each machine manages
> its partition where maildirs associated to controlled domains are.
>
> 1. Both machines active.
>
> Qmail-LDAP-Cluster is interesting when both machines are up. Mailhost
> attribute tell in which machine (mx1 or mx2) maildir is. If balancer
> carries the session to a wrong qmail (where maildir is not mounted),
> QMQP transfers SMTP/POP3/IMAP session to the right instance of qmail.
> Notice that ldapclusterhost file can not have
> both machine names (mx1.domain.com and mx2.domain.com) because
> in that case, session is not transfer between qmail instances.
>
> 2. One machine is down.
>
> At this moment, both partitions are mounted on the active machine. So,
> only one Qmail must manage all domains. Ldapclusterhost files should be
> used in this moment. Now Ldapclusterhost should has mx1.domain.com and
> mx2.domain.com.
>
>
> We think that the same script that mount the partition in the active
> machine, changes the content of Ldapclusterhost file. But I'd like to
> ask if someone has a similar scenario or qmail-ldap-cluster let do a
> backup cluster in an automatic way, using only control files.
>
> Thanks in advanced.
> Regards.
>
--
___________________________________________
Antonio M. Guirado Puerta
Sistemas de Información y Comunicaciones
Fundación Integra. http://www.f-integra.org
Teléfono: +34 968 355161
Fax: +34 968 355131
Correo: antonio.guirado@f-integra.org
___________________________________________
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