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Thread: [SOLVED] How many users can zimbra support?

  1. #1
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    Cool [SOLVED] How many users can zimbra support?

    I am using zcs 5.0.5 Open Source Version.

    I would like to ask you that " How many users i can create in zimbra server " ?

    I have following query.

    Total Users :- 10,000 Nos.
    Incomming mail per hour :- 25,000 Nos.


    Tell me Is it possible with ZIMBRA Mail Server?

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    What are the specs of your server(s) ? Do you have a single or multi node install ?

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    I have a XEON based Server rack system with 20 GB of space.
    I will assign 100 MB for each user & I can increase my disk space also. No,there is no issue regarding mail storage capacity.

    I am using zimbra on a single hardware rack.Backup server is different to take zimbra mail backup's.

    Just I need to confirm practically about 10,000 Users creatinon & maintenance & 25,000 mails every hour.

    Please tell me,is it possible.

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    How much memory does the server have ? For a start have a read through Performance Tuning Guidelines for Large Deployments - Zimbra :: Wiki

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    My Server is having 8 GB of DDR2 RAM. ( 1 GB Each with 8 memory slots)

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    I don't think putting all this on a single server is a good idea.

    I would put at two ZCS-MTA, in order to be redundant and to get the AV/AS on dedicated hardware (high CPU and RAM needed for 25K mails per hour). Same for LDAP, two of them, especially because MTA uses them a lot.

    100 MB for 10K users with 25k mails per hours seems quite short (or the mails are really tiny) and I'm not sure this amount of mail can be handled by "simple" HDs.

    So, IMHO, it's not a "single server setup" but a "multi-servers infrastructure, with SAN".

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    ok sir. I understood. Thanks.

    But,just tell me zimbra is capable to handle 10,000 users & 25,000 mails per hour? How much possibiliy is there about to crash the zimbra mail server?

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    Yes it's capable of that, but the point is it's not the number of users - I can think of some 6-20 million user instances What we're trying to say is that you're gonna need more than one server for 10k users and having it process 25k emails/hr.

    It's pretty hard to give a hardware recommendation on just those 2 figures you provided. Klug gave it a shot from experience and guesses you'll need at least LDAP Master, LDAP replica, 2xMTA, 2xMailstores.

    Basic questions to consider:

    Total Number of Users?
    -10,000

    Number of Active Users? (checking email, calendar, contacts, etc. at least once a day)

    Number of Concurrent Users? (logging into the UI, checking email, calendar, contacts during Message Delivery Peak Period (see question below)

    What percentage of total users will be using Webmail vs POP vs IMAP vs Mobile vs Outlook?
    For example 60% Webmail, 50% IMAP, 10% POP (I don't care if this adds up to 100% of the 10k user count, ie we can consider the fact that users may be accessing ZCS via multiple different clients)
    GAL lookups being done from those IMAP clients?

    Message Delivery Peak Period in minutes?
    Period of time in minutes where message delivery (inbound + outbound) is the highest (i.e. from 10am to 12pm then 120 minutes)

    Percentage Message Delivery Peak Workload?
    What percentage of workload is occurring during the message delivery peak period(s) (i.e. 80% of workload occurs from 10am to 12pm)

    Mailbox Quota per user (MB)?
    -100MB

    Average Mailbox Utilization Percentage % of Quota? (how much of that quota will they generally use) or Average Mailbox Size (MB)?

    Will you be using the Zimbra AS/AV on Zimbra MTAs?

    If no to above, would you have your third party Anti-Spam appliances querying Zimbra LDAP server to check on unknown recipients?

    Total Incoming messages per day?

    Total Prespam Incoming Messages per day? (Prespam = SPAM + LEGIT)

    Total Postspam Incoming Messages per day? (Postspam = LEGIT)

    Number of Postspam Incoming Messages per day? (Postspam = LEGIT)

    Total Outgoing messages per day?

    Number of Outging messages per user per day?

    You gave us 25,000/hr but we have no idea on the mix of incoming/outgoing or if it's already pre-spam processed.
    About the only math I can do with that is:
    25,000*24=600,000 emails per day (no clue incoming vs outgoing - 50/50?)
    600,000 emails / 10,000 users = 60 emails per person per day (again no clue if in/out)

    Average Message Size (KB)?

    Percentage % of Messages with attachments?

    Average Attachment Size (KB)?

    Hardware
    1 box w/ 8 GB of DDR2 RAM (you're gonna want more than 1 box) unknown CPU's

    Storage
    20 GB unknown disks... A) That's not very much! B) We need to know factors like if are you planning to just use on-box storage (SCSI, SATA) or go with a SAN (Fiber, iSCSI) ?
    (I hope that's RAID10 not RAID5)
    Last edited by mmorse; 06-17-2008 at 10:54 PM.

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    Simpler phrasing: If you already have 10k users and are handling 25k mails/hr what's your current hardware & software setup?

    I get the feeling you're just planning for future expansion of a new service your providing - cool - if you're migrating existing customers might be better to tell us about current numbers you plan to throw against that 1 box, and we can tell you if you what to expect etc.

    Or do you want to know the max (users? emails?) we think 1 box w/ 8 GB of DDR2 RAM w/ unknown CPU's and 20GB of unknown disk type and RAID configuration can handle... (to which we need more info about the previously mentioned please!)

    ---

    Here's 11k users on 2 mailstores - keep in mind this doesn't list amount of mail traffic, MTA config (mail & spam processing), LDAP setup, or storage, or type of access Web-UI vs IMAP vs POP vs mobile vs MAPI - for all we know his entire mail setup could be on just those 2 boxes or spread out accross 8:
    Quote Originally Posted by su_A_ve View Post
    1K users on this box... This is a dual xeon x5365 with 8gigs for the grownups

    Code:
    top - 12:58:32 up 12 days,  6:41,  2 users,  load average: 0.55, 0.36, 0.37
    Tasks: 223 total,   1 running, 222 sleeping,   0 stopped,   0 zombie
    Cpu(s):  7.3% us,  0.5% sy,  0.0% ni, 91.9% id,  0.2% wa,  0.0% hi,  0.1% si
    Mem:   8160668k total,  7934412k used,   226256k free,   248196k buffers
    Swap: 16777208k total,      176k used, 16777032k free,  3959576k cached
    10K users on this one... dual Xeon 5160 with 8 gigs for the kids

    Code:
    top - 13:02:41 up 12 days,  5:30,  1 user,  load average: 1.86, 1.51, 1.25
    Tasks: 218 total,   1 running, 217 sleeping,   0 stopped,   0 zombie
    Cpu(s): 27.8% us,  2.6% sy,  0.0% ni, 60.6% id,  8.7% wa,  0.0% hi,  0.2% si
    Mem:   8165728k total,  8119988k used,    45740k free,    67504k buffers
    Swap: 16779884k total,      256k used, 16779628k free,  2638624k cached
    (Just noticed some high utilization from mysql - hmm)
    Last edited by mmorse; 06-17-2008 at 10:57 PM.

  10. #10
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    I understood what you are saying.

    Now,kindly tell me that How to create secondary server of zimibra mail ?

    Right Now,I am using a single server hardware with no data redundancy.So,my first priority is to take my mail server's full backup.

    So,tell me the brief procedure to take user mail,address book & all necessary backup's of my Zimbra Mail Server.

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