Zimbra Tips : Things to do after upgrading RAM

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Sometimes, I got my Zimbra very slow when accessed. So, I decide to upgrade RAM on my Zimbra Server. But, my Zimbra server is still slow. And got “sqltrace – Slow execution” from mailbox.log

2019-05-10 10:00:53,897 INFO  [qtp335471116-1747232:http://localhost:8080/service/soap/BatchRequest]
8.X.X_XX_XXXX;soapId=3e2f6cd7;] sqltrace - Slow execution (7784ms): SELECT mi.id, mi.type,
 mi.parent_id, mi.folder_id, mi.prev_folders, mi.index_id,mi.imap_id, mi.date, mi.size, mi.locator,
 mi.blob_digest, mi.unread, mi.flags, mi.tag_names, mi.subject,mi.name, mi.metadata, mi.mod_metadata,
 mi.change_date, mi.mod_content, mi.uuid FROM mboxgroup16.mail_item AS  mi WHERE mailbox_id =
 1016 AND parent_id = 24192  ORDER BY mi.date DESC, mi.id

My Zimbra is still slow because I didn’t adjust the configuration of java_heap and my.cnf. You can see performance tuning guidelines from this link: https://wiki.zimbra.com/wiki/Performance_Tuning_Guidelines_for_Large_Deployments#Local_Config_Variables

And this is what I do after upgrading RAM

Set java_heap 20% – 25% of system memory. The following configuration is an example when having RAM 16 GB

su - zimbra
zmlocalconfig -e mailboxd_java_heap_size=4096

Adjust my.cnf with the new innodb_buffer_pool_size value. Perform this command

su - zimbra
/opt/zimbra/libexec/zmmycnf > /tmp/newmycnf.txt

Compare my.cnf with the new one

diff /opt/zimbra/conf/my.cnf /tmp/newmycnf.txt

[zimbra@myzimbra ~]$ diff /opt/zimbra/conf/my.cnf /tmp/newmycnf.txt
< innodb_buffer_pool_size = 629000601
> innodb_buffer_pool_size = 1030253568

The new innodb_buffer_pool_size value is 1030253568. Stop Zimbra services and open my.cnf and adjust innodb_buffer_pool_size with the new value. Then, restart Zimbra services again.

Now, my Zimbra faster than before

Good luck 🙂


  1. do u mena innodb_buffer_pool_size = 1030253568 >> 10 GB or 1GB.

    I am really confused on this number,so what is the number?

    Also, is there another configuration value for increasing up the zimbra proformance.

    what is the best zimbra server configuration for 8XX mailboxes “400 active”

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