Re: qmail-ldap and GFS

Now the NFS is in only one nfs server. All qmail's backends mount the same
mailboxes from the unique nfs server. I'm using courier as imap server and I
don't have any problems with it.

The traffic between the backends are managed by a hardware level 7 balancer.

2010/11/3 Ibrahim Harrani <[email protected]>

> Hi David,
>
> Do you mount the same mailboxes on different backends at the same time in
> your two nfs share setup?
> If so, what about imap(dovecot in my case) locking issues?
> I am also thinking to mount the all/same mailboxes on different backends
> via NFS  at the same time.
> but as far as I read, dovecot does not like this kind of setup. (
> http://wiki.dovecot.org/NFS)
> If I do not share the with the different NFS,  I think one server will not
> enough to handle 100.000-150.000 account?
>
>
>
> Thanks
>
> 2010/11/3 David Rodríguez Fernández <[email protected]>
>
>  Hi, You can have performace problems with the io/s from your filesystem,
>> is a problem inherent to hardware (disk and network).
>> I have a similar escenario with all mailboxes in a NFS server. In my setup
>> the filesystem is over a SAN disk distributed over a great numbre of disks
>> with lvm and the nfs server have ethernet cards with 10G in a 802.3ad
>> bonding. This setup have H.A. with heartbeat with other node as backup. This
>> is an older setup and I only have changed the hardware, but I'm thinking
>> make a H.A. active-active with two options:
>> One similar to you with gfs or oraclefs
>> And other creating two nfs shares (one for every nfs server), with the
>> user distributed over the two shares, and one server acting as backup of the
>> other.
>>
>> In my actual config I don't have any problem. Only a clue, don't use
>> reiserfs for NFS exported filesystem, was my error.
>>
>>
>> On Wed, Nov 3, 2010 at 16:25, Ibrahim Harrani <[email protected]>wrote:
>>
>>> Hi,
>>>
>>> Currently, my domains and users are distributed to different mailhosts in
>>> my qmail ldap cluster.
>>> In this setup, If I one of the mailhost is down, the users can't access
>>> to mailbox on this server.
>>> To setup a redundant system,  I would like to keep mailbox on GFS file
>>> system with multiple backends.
>>> All backends will share the same GFS partition. There will be one
>>> mailhost entry in openldap entries and
>>> load balancer to distrube pop3/imap and smtp connections to backends. If
>>> one of the backend is down, this will not effect
>>> the users.
>>>
>>> But, I have some doubts about locks and I/O issues. Can you please share
>>> your experience about this kind of setup?
>>>
>>> Thanks
>>>
>>>
>>
>>
>> --
>> POR FAVOR, si reenvia este correo, tenga en cuenta lo siguiente:
>> 1.- Borre la dirección del remitente así como cualquier otra dirección que
>> aparezca en el cuerpo del mensaje.
>> 2.- Proteja las direcciones de los destinatarios colocando las mismas en
>> la línea de CCO (CON COPIA OCULTA)
>>
>> Combatir el spam es tarea de todos.
>>
>
>


-- 
POR FAVOR, si reenvia este correo, tenga en cuenta lo siguiente:
1.- Borre la dirección del remitente así como cualquier otra dirección que
aparezca en el cuerpo del mensaje.
2.- Proteja las direcciones de los destinatarios colocando las mismas en la
línea de CCO (CON COPIA OCULTA)

Combatir el spam es tarea de todos.