Re: Question for upgrading

[Nic Bernstein <nic@xxxxxxxxxxx>]

On 12/13/18 9:52 AM, Egoitz Aurrekoetxea wrote:

I was trying to upgrade part of our Cyrus imap installation, concretely that one consisting in still 2.3. I was planning to set up Cyrus 3.0. I have seen all works properly except for the unexpunge command because as someone stated here, a reconstruct -V max was needed.The problem is that this reconstruct command, takes ages and I'm not able to keep the service offline so many time. So I have been thinking in the following scenario :

Egoitz,
As long as you've followed all of the various steps needed to account for version changes, as outlined in the Release Notes for all intermediary releases, then the last step should be the updating of the indexes.  Rather than running "reconstruct -V max" on all mailboxes at once, simply run it on subsets.  We've done this on large installations without ill effect.  You can have the service on line during the reconstruct, and, as you note, have most all functionality present.

We build a list of users (mboxlist.txt), and then run a cron job, during off-peak hours, using the 'parallel' command like so (from 'crontab -e -u cyrus'):

###
## Start a batch of recursive reconstruct jobs at 7PM and discontinue
## at 6:53AM.
0 19 * * * parallel -j 5 --resume --joblog /var/lib/imap/reconstruct.log cyrus reconstruct -G -V max -r -u {} < /var/lib/imap/mboxlist.txt
53 06 * * * kill -TERM `ps ax | grep [p]arallel | awk '{print $1}'`

Cheers,
    -nic

-- 
Nic Bernstein                             nic@xxxxxxxxxxx
Onlight Inc.                              www.onlight.com
6525 W Bluemound Rd., Ste 24	          v. 414.272.4477
Milwaukee, Wisconsin  53213-4073	  f. 414.290.0335

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