[Dovecot] Server 1.0.1 migration: Maildir : UID inserted in the middle of mailbox [resolved]

[damien chambe - EGS]

DINH Viêt Hoà a écrit :
> On 6/27/07, damien chambe - EGS <damien.chambe at groupe-laurent.com> wrote:
>> Timo Sirainen a écrit :
>> > On Fri, 2007-06-22 at 00:28 +0200, damien chambe - EGS wrote:
>> >
>> >
>> >> Our Dovecot server had to be changed due to a hardware problem
>> >> I was forced to use SUSE SLES 10 for the new one, instead of SLES
>> 9 on
>> >> the old server.
>> >>
>> >
>> > The kernel matters a lot with NFS. Some kernels are more broken than
>> > others. Attribute cache also matters. http://wiki.dovecot.org/NFS
>> >
>> >
>> >> I store mails on NFS, and index on local disk. There's only one
>> >> dovecot
>> >> server, so no multiple access.
>> >>
>> >
>> > So deliver is also run on the same server? If all of it is done on the
>> > same server, then pretty much the only thing you can change is the
>> > kernel or somehow try to work around its bugs. I can think of only
>> this
>> > fix on Dovecot's side:
>> >
>> > http://dovecot.org/list/dovecot/2006-December/018145.html
>> >
>> > Hmm. Actually I just realized another reason that could cause
>> these: Are
>> > the clocks on the NFS server and on your Dovecot machine synchronized?
>> > They must be less than 1 second apart at all times or you'll begin to
>> > see problems.
>> >
>> >
>> I've tried to update kernel (SUSE SLES 10 is 2.6.16) but no change.
>> But synchronizing NFS server and dovecot server with NTP did the trick.
>>
>> SUSE SLES9 NFS was more tolerant than SLES 10 with time sync...
>>
>> No more uid messages yesterday !
>
> did you use the following on the NFS server :
> option "no_subtree_check" in /etc/exports
> I know that it solved some bugs when accessing files through mmap() on
> a NFS filesystem.
>

I can't easily modify export option on the NFS server, it's a Lifekeeper
DRDB cluster,
I've used noac for the mount on the dovecot side.
It slows downs a little but it is very reliable on my config.

Damien