Search Our Database

Introduction

When managing large mailboxes in cPanel, users may encounter slow search performance due to high memory usage by the index-worker and Solr processes. This can significantly impact user experience, especially in environments where efficient email search is critical. In cPanel, Solr is used to index and search mail content. However, default memory allocations can sometimes limit Solr’s performance with large data sets. Adjusting Solr’s memory allocation can help optimize search speed and efficiency, though this must be done manually, as cPanel’s WHM GUI does not provide direct configuration options for Solr.

This guide details the steps required to increase the Solr memory limit by modifying configuration files on a cPanel server. It is intended for server administrators who have SSH access and need to fine-tune their Solr plugin settings to handle large-scale mailbox searches more effectively. Properly increasing Solr’s memory allocation can prevent memory overuse and provide faster search results within large mailboxes.

Prerequisites

• SSH Access to the Server: Administrative access to the server where cPanel is installed.
• Solr Plugin Installed: Verify that the Solr plugin is already installed on the server.

Step-by-step Guide

Step 1: Locate the Configuration File

Using SSH, open the Solr configuration file located at:

/etc/sysconfig/cpanel-dovecot-solr

Step 2: Adjust the Memory Limit

In the configuration file, find the parameter SOLR_MEMORY. This parameter sets the memory limit for Solr and is typically set to 512M by default.

Step 3: Update the Memory Limit

Modify the SOLR_MEMORY value to increase Solr’s memory allocation. For instance, to increase the limit to 750M, update the line as follows:

SOLR_MEMORY=750M

This change allows Solr to use more memory resources for indexing and searching, which can enhance performance for large mailboxes.

Step 4: Restart the Solr Service

To apply the changes, restart the cPanel Dovecot Solr service by executing the following command:

/usr/local/cpanel/scripts/restartsrv_cpanel_dovecot_solr

This command reloads the Solr service with the updated memory allocation settings.

Conclusion

Increasing the Solr memory limit enables more efficient memory utilization during mailbox indexing and searching, which can improve search performance in cPanel’s webmail applications. It is recommended to monitor the system’s performance after making this adjustment to ensure optimal functionality.

Should you have any inquiries about the guidelines, please feel free to open a ticket through your portal account or contact us at support@ipserverone.com. We’ll be happy to assist you further.