Upgrading from 2.3 to til 2.4

[Wesley Craig]

It's usually possible in a murder configuration to do a zero downtime upgrade by xfer-ing users to a backend running the new version.  The admin is then in control of how much index upgrade load to inflict on the new machine.

:wes

On 10 May 2011, at 11:41, Henrique de Moraes Holschuh wrote:
> On Tue, 10 May 2011, Per Steinar Iversen wrote:
>> Running a reconstruct on user.% before allowing in new mail, after the 
>> upgrade, seems to be a better and more orderly option than allowing 
>> sendmail to do the job?
> 
> That's certainly how we always do it here.  We pause the new email feed at
> the MTAs (so that it will just queue), firewall off any user access, run a
> full backup, do the upgrade, trigger a full reconstruct and quota rebuild,
> and test everything before we restore service.
> 
> Better the planned downtime, than surprise breakages.