There is something weird at /var/log/messages when the pb occurs: Jun 8 04:26:33 anarki kernel: nfs: server xxx.xxx.xxx.xxx not responding, still trying Jun 8 04:26:35 anarki kernel: nfs: server xxx.xxx.xxx.xxx OK
This error message is self-explanatory: no timely response was received from the NFS server.
This is usually caused by an overloaded network.
And last but not least, it seems that a privileged user has a very big MailBox ( almost 4giga) and the problem occurs almost at the time when he makes a search in his mailbox. So, do you guys have an idea about what's happen ?
Very likely that your network does not have sufficient capacity to handle such a load.
Is it linked to this huge mailbox ? Is there a solution, a test or something else in order to be sure that this is the cause of the failure ?
Contact your network administrator.
Is there a way to accelerate the searches ?
There's nothing to accelerate. The IMAP server runs on the NFS client. The mailbox runs on the NFS server. To have the client search a four gigabyte mailbox it is necessary to transfer four gigabytes of data from the server to the client. Data does not travel through hyperspace. One way or another it's got to get from the server to the client.
Your network is probably unable to transfer all this data fast enough. NFS usually uses UDP. When the network is saturated, UDP packets will get dropped on the floor.
Either beef up your network capacity, or get rid of four gigabyte searches.
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