Learn the replication best practices and recommendations for Symantec Endpoint Protection (SEP).

Replication duplicates data between databases on separate sites so that both databases contain the same information. If one database fails, you can manage the entire site by using the information on the database from another site.

A replication partner is a management server on another site with a different database and management server(s). A site may have as many partners as needed. Each partner, or remote site, connects to the main site or local site, which is the site that you are logged on to. All sites that are set up as partners are considered to be on the same site farm.

Each site with which you replicate data is either a replication partner or a site partner. Both replication partners and site partners use multiple servers, but the database they use and the way they communicate is different.

• Replication causes data to be transferred or forwarded to another SEPM.
• A replication partner is a SEPM that is part of another site.
• Sites can have multiple replication partners.
• Changes made on any partner are replicated to all sites.
• Policies and groups are replicated.
• Replication between any version of SQL Server data base and the embedded database is supported.

Before setting up replication

Consider the following when you plan for replication:

• Maximum number of sites 
  Ideally, keep the number of sites below five (5).
• Network bandwidth and link capabilities
• Network latency
• The size of the database on the primary site
• The presence of a firewall, proxy, router, or other similar types of hardware between two sites
• Whether the firewalls or routers have a packet-scanning mechanism built in
  This mechanism can strip the zip files that are passed between replication partners.

Sizing the replication server

A replication server requires a larger database than a single-server installation. The increased size requirements for the replication server include the following factors:

• Number of managed clients
• Client installation package sizes retained in the database
• Number of log files retained
• Database maintenance settings
• Log size and expiration timeframes
• Definition update sizes
• Database backup information requirements

In general, you should expect the hard disk requirements for the replication server to be at least three times the hard disk space used by the original Symantec Endpoint Protection Manager for the initial replication.

See the Sizing and Scalability Best Practices White Paper for more information.

Adding a new site to an existing replication partner

• Make sure the replication schedule is not set to Automatic.
• Make sure the LiveUpdate schedule is not set to Continuous or Every 4 hours.
• Replication should not overlap with a scheduled LiveUpdate session.
• Lower the count of content revisions in the LiveUpdate settings.
  Note: A lower number of content revisions increases the likelihood that a client requests a full set of definitions. If many clients request a full set of definitions from SEPM at once, you may experience bandwidth issues.
• Purge the SEPM logs.
• Do not use more than 10 replication partners.
   

Database support

Review the SEPM system requirements for the version of Symantec Endpoint Protection that you use.
 

Best practices

• For more than 3 sites or 1000 clients with slow link, do not schedule replication more frequently than once per day. 
  Please test the replication time and adjust the schedule to account for a replication that might sync across a majority of the data.
• The SEPMs must be the same version. Replication does not occur if the schemas do not match.
• Replication schedules should not overlap.
• If replication occurs over a Wide Area Network (WAN), only replicate the logs.
• Ideally, you should keep the number of replicated sites below 5. The ratio would be 1:4; i.e. 1 primary site, 4 secondary sites.
• If you have configured multiple replication partners, then make sure that the replication schedules do not overlap. This situation can lead to database deadlock issues.
• Delete replication partners when:
  
  • Updating the SEPM server certificate.
  • You need to execute Support-supported tools.
  • You perform software or hardware maintenance on the SEPM.
  • Backing up database manually.
     

Gather troubleshooting information

Gather the following information to assist with troubleshooting:

• Tomcat logs from both sites
• Tomcat logs from the primary site (Site 1) and Install Error logs from the secondary site (New Site), if the initial replication fails
• IP addresses and server names
• Database backup (SQL Server or embedded)
• Wireshark logs to check for network issues
• SymHelp tool logs (full data) from all the sites
   

Details

Replication initiates if there is any change in the Update Sequence Number (USN). Every record in the database is associated with a USN. The USN increments/updates every time there is a change in the records. Data comparison happens on the basis of the USN. The USN defines whether a record is to be added or modified.

Additional replication resources

See Setting up sites and replication.