[Dovecot] NFS rquota support

[Mike Brudenell]

Greetings -

On 7 Aug 2007, at 13:54, Stewart Dean wrote:

> Sorry to be so clueless, but all the activity about rquotad drives  
> me to admit my puzzlement (or ignorance)...
> I run rquotad on my mail server that also runs DC....rquotad is  
> used by the other 3 hosts (a login/FTP server, a mailing list  
> server and a user mgmnt server) that NFS mount the folder and inbox  
> filesystem...which are under filesystem quota on the mail server  
> where they are physically resident.  AFAIK it is not queried on the  
> mail server...after all, filesystem quota is running there.  How/ 
> why does DC need/use rquotad?

I think you have answered your own questions actually! ...

rquotad is used to allow other machines that NFS-mount a filestore.   
The rquotad daemon runs on the machine serving up the filestore to  
the other clients.

You say that your mail filestore physically resides on your mail  
server.  That means it is a locally attached disk (not mounted using  
NFS from some other server), and so Dovecot can, and does, obtain  
quotas directly from it: it does not need to ask an rquotad daemon.

In contrast here we have the mailstore on a NetApp filer, and mount  
it over NFS on our machines running Dovecot.  In this case Dovecot  
cannot query the quota directly because the filestore isn't on  
locally attached disk.  Instead it must use an RPC (Remote Procedure  
Call) to ask the rquotad daemon running on the file server (in this  
case the NetApp filer) what the quota usage and limits are.

Cheers,
Mike B-)

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