Page 1 of 2 12 LastLast
Results 1 to 10 of 14

Thread: Migrating cyrus to zimbra open source with more 20 thounsands mailbox

  1. #1
    Join Date
    Nov 2009
    Posts
    9
    Rep Power
    6

    Default Migrating cyrus to zimbra open source with more 20 thounsands mailbox

    Hi guys, we know that tool imapsync is for that, but actually mail server has more than 20 thounsands mailboxes in cyrus with quotas size around 300 Mb until 3 Gb.
    this old production server can't be stopped because don't have redundancy and it's a critical and important service by the university where i work.
    We made an estimation about migration time and the result is about 15 days of migration with old production server down.
    Anybody have some other solution or experience about that?
    Thanks!

  2. #2
    Join Date
    Mar 2007
    Location
    Sevilla
    Posts
    8
    Rep Power
    8

    Default

    I did that migration (cyrus to Zimbra) 2 years ago.I have less mailboxes (about 1000).
    I use imapsync 2 times :

    - 1 day before migration with cyrus server online ( big process, much time)
    - The day of de migration with cyrus server offline ( only sync one day mail, little time )

    Best regards

  3. #3
    Join Date
    Jan 2007
    Location
    Minnesota
    Posts
    719
    Rep Power
    9

    Default

    Our 2000 large mailboxes took about 7 days for initial background sync. There was *no* general service downtime. The trick is to queue mail, kill existing sessions, and rename the account at the right time. Final incremental sync for the largest mailbox (5gb) took about 1 hour. I think I posted some scripts here about 30 months ago.

  4. #4
    Join Date
    Nov 2009
    Posts
    9
    Rep Power
    6

    Default

    i' ll looking for stripts posted or if you have links, send it please. I also read this link http://www.zimbra.com/forums/migrati...llel-runs.html
    By Other Side, I received answer by other forum (linkedin) about subject. A group had a 1 month lead time on a recent upgrade project, they did for NYU and that was just an upgrade.... they had about 20K mboxes too. Migration is a lot more time consuming.

  5. #5
    Join Date
    Oct 2005
    Location
    USA, Canada and India
    Posts
    777
    Rep Power
    11

    Default

    why not do it in small steps of few thousand users at a time by using Split domain ( Split Domain - Zimbra :: Wiki ) setup of zimbra..you can take your sweet time and there will be 0 downtime

    there IS planning and other stuff involved but no downtime for sure

    Raj
    i2k2 Networks
    Dedicated & Shared Zimbra Hosting Provider

  6. #6
    Join Date
    Nov 2009
    Posts
    9
    Rep Power
    6

    Default

    Do you have experience using Zimbra with mailboxes around 20 thousands? Zimbra documentation on the Web shows their experience about that, but I want to know your experiencies because this migration is an important decision.

  7. #7
    Join Date
    Oct 2005
    Location
    USA, Canada and India
    Posts
    777
    Rep Power
    11

    Default

    Well we host way more than 20K mailboxes in total on our zimbra network for our customers.
    we moved more than 30,000 mailboxes from Imail to Zimbra over the years.

    what you need is a plan to move small set of users at a time and then you keep replicating that plan and you will finish with no downtime.
    main highlights of the plan should be.

    1) new zimbra infrastructure setup
    2) full inventory of all user info and how to inform them about the changes that will take place.
    3) make zimbra as you front end MX using split domain so all mail still flows to your old setup
    4) move small set of uses at a time and update split domain info for them
    5) repeat step 5 tilll you finish

    i don't see any problem why you cannot do it.

    PS: Most importantly question is which version you going to use OSS or NE..if you going to use NE..then zimbra will provide you ample support and planning.

    if you doing OSS install then you need to sit and plan and do a small test setup. and as usual we are here to help.

    Raj
    i2k2 Networks
    Dedicated & Shared Zimbra Hosting Provider

  8. #8
    Join Date
    Nov 2009
    Posts
    9
    Rep Power
    6

    Default

    We are going to use OSS. Well, We'll go to take your ideas for the migration. Split Domain is a good option, i will asking you if I have any doubt, Thanks for all!
    Last edited by emacias; 02-17-2010 at 11:44 AM.

  9. #9
    Join Date
    Nov 2009
    Posts
    9
    Rep Power
    6

    Default

    Hi, i want to know your experience installing zimbra in virtual machines, Actually, we have SUN Blades, well now is Oracle Blade and other decition to take is to install zimbra in native S.O. from Blade or to install this in virtual machine. Of course performance, I/O and other elements are important to consider. Like you know, we have more of 20 k accounts and It's an importante service.

  10. #10
    Join Date
    Oct 2005
    Location
    USA, Canada and India
    Posts
    777
    Rep Power
    11

    Default

    well...if you going to use OSS which has no backup option without stopping the services then properly sized virtual environment can give you better "hot vm backup" options based on vendor.

    zimbra works on Vmware like a charm, you just need to now your Virtualization stuff.

    Raj
    i2k2 Networks
    Dedicated & Shared Zimbra Hosting Provider

Similar Threads

  1. [SOLVED] Zimbra logwatch.
    By nishith in forum Administrators
    Replies: 5
    Last Post: 06-10-2009, 05:42 PM
  2. ISP mail connection errors out
    By egottwald in forum Error Reports
    Replies: 1
    Last Post: 10-13-2008, 11:59 PM
  3. Zimbra spam system
    By rajahd in forum Administrators
    Replies: 9
    Last Post: 04-16-2008, 08:25 PM
  4. 4.5 Upgrade failure
    By brained in forum Installation
    Replies: 9
    Last Post: 03-03-2007, 03:30 PM
  5. Unable to start tomcat
    By chanck in forum Administrators
    Replies: 11
    Last Post: 06-11-2006, 01:58 AM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts
  •