Each Zimbra mailbox server is configured with one primary message volume and an index volume. Additional secondary message volumes can be added.
Before adding a new volume, the directory path must already exist.
Go to Configure>Server.
Select the server and in the gear icon click Edit.
Open to the Volumes page and click Add.
Enter the volume name, root path for the new volume, and select the volume type:
Primary Message
Secondary Message
Index
If you want to compress blobs, check Compress Blobs and set the compression threshold.
Click OK.
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