ZCS Administrator's Guide Network Edition 6.0.8
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Managing ZCS Configuration : Managing Servers

Managing Servers
A server is a machine that has one or more of the Zimbra service packages installed. During the installation, the Zimbra server is automatically registered on the LDAP server.
You can view the current status of all the servers that are configured with Zimbra software, and you can edit or delete existing server records. You cannot add servers directly to LDAP. The ZCS Installation program must be used to add new servers because the installer packages are designed to register the new host at the time of installation.
The server settings include:
General information about the service host name, and LMTP advertised name and bind address, and the number of threads that can simultaneously process data source imports
Authentication types enabled for the server, setting a Web mail MTA hostname different from global. Setting relay MTA for external delivery, and enabling DNS lookup if required.
Enabling POP and IMAP and setting the port numbers for a server. If IMAP/POP proxy is set up, making sure that the port numbers are configured correctly.
Servers inherit global settings if those values are not set in the server configuration. Settings that can be inherited from the Global configuration include MTA, SMTP, IMAP, POP, anti-virus, and anti-spam configurations.
General Server Settings
The General Information tab includes the following configuration information:
LMTP information including advertised name, bind address, and number of threads that can simultaneously process data source imports. The default is 20 threads.
Purge setting. The server manages the message purge schedule. You configure the duration of time that the server should “rest” between purging mailboxes from the administration console, Global settings or Server settings, General tabs. By default, message purge is scheduled to run every 1 minute.
When installing a reverse proxy the communication between the proxy server and the backend mailbox server must be in plain text. Checking This server is a reverse proxy lookup target automatically sets the following:
The Notes text box can be used to record details you want to save.
Services Settings
The Services tab shows the Zimbra services. A check mark identifies the services that are enabled for the selected server, including LDAP, Mailbox, IMAP and POP proxy, MTA, SNMP, Anti-virus, Anti-spam, Spell Checker, and Logger.
MTA Server Settings
The MTA tab shows the following settings:
Authentication enabled. Enables SMTP client authentication, so users can authenticate. Only authenticated users or users from trusted networks are allowed to relay mail. TLS authentication when enabled, forces all SMTP auth to use Transaction Level Security (similar to SSL) to avoid passing passwords in the clear.
Network settings, including Web mail MTA hostname, Web mail MTA timeout, the relay MTA for external delivery, MTA trusted networks ID, and the ability to enable DNS lookup for the server.
IMAP and POP Server Settings
From these tabs, you can configure IMAP and POP availability on a per server basis.
Volume Settings
In the Volume tab you manage storage volumes on the Zimbra Mailbox server. When Zimbra Collaboration Suite is installed, one index volume and one message volume are configured on each mailbox server. You can add new volumes, set the volume type, and set the compression threshold.
Note: If Compress Blobs is enabled (YES), the disk space used is decreased, but memory requirements for the server increases.
Index Volume
Each Zimbra mailbox server is configured with one current index volume. Each mailbox is assigned to a permanent directory on the current index volume. You cannot change which volume the account is assigned.
As volumes become full, you can create a new current index volume for new accounts. When a new current volume is added, the older index volume is no longer assigned new accounts.
Index volumes not marked current are still actively in use as the index volumes for accounts assigned to them. Any index volume that is referenced by a mailbox as its index volume cannot be deleted.
Message Volume
When a new message is delivered or created, the message is saved in the current message volume. Additional message volumes can be created, but only one is configured as the current volume where new messages are stored. When the volume is full, you can configure a new current message volume. The current message volume receives all new messages. New messages are never stored in the previous volume.
A current volume cannot be deleted, and message volumes that have messages referencing the volume cannot be deleted.
Scheduling HSM Sessions
Sessions to move messages to the secondary volume are scheduled in your cron table. See Global HSM. From the administration console, when you select a server, you can manually start a HSM session, monitor HSM sessions, and abort HSM sessions that are in progress from the Volumes tab.
When you abort a session and then restart the process, the HSM session looks for entries in the primary store that meet the HSM age criteria. Any entries that were moved in the previous run would be excluded, as they would no longer exist in the primary store.
Backup and Restore - selecting the backup mode
Two distinct backup methods are available on ZCS.
The standard backup method is to run a weekly full backup session and daily incremental backup sessions to back up all mailboxes daily. The standard backup method is appropriate for enterprise deployments where full backups are run during non-working days.
The auto-grouped backup method is recommended for large ZCS environments where running a full backup of all accounts at one time would take too long.The auto-grouped backup method runs a full backup session for a different group of mailboxes at each scheduled backup. The system administrator configures the interval that backups should run and configures the number of groups that backups are made up of. ZCS then automatically backs up mailboxes in groups over the interval specified.
The standard backup method is the default. If you want to use the auto-grouped method, select that from the drop-down. See Backup and Restore for information about these two methods.

Managing ZCS Configuration : Managing Servers

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ZCS Administrator's Guide Network Edition 6.0.8
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