The Server, Volume Management tab can be used to manage storage volumes on your Zimbra Mailbox server. When Zimbra Collaboration Suite is installed, one index volume and one message volume are configured on each mailbox server.
The Index volume is /opt/zimbra/index
The Message volume is /opt/zimbra/store
Each Zimbra mailbox server is configured with one current index volume. Each mailbox is assigned to a permanent index directory on the current index volume. When an account is created, the current index volume is automatically defined for the account. You cannot change which index volume the account is assigned.
As volumes become full, you can create a new current index volume for new accounts. 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.
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.
The volume tab shows the following information
Volume Name. The name of the volume. The initial volumes are named index1 and message1.
Volume Root Path. The location in the file system where volume data is stored.
Volume Type. The volume type is either Index or Primary Message, Secondary Message.
Compress Blobs. When this box is checked, message blobs whose size is above the compression threshold are compressed.
Status. This displays "current" when the volume is current.
Compression Threshold. Messages larger than the threshold are compressed. The default threshold is 4096 bytes.
Before adding a new volume, the directory path must already exist.
Select the server from the Servers list.
Go to the Volumes tab and click Add New Volume. A new line appears with empty fields.
Enter the volume name, root path for the new volume, and select whether the volume is Index or Message.
Click Save.