[SOLVED] Zimbra volume type: primaryMessage and secondaryMessage, what does it mean?

[zmchina]

As of CLI zmvolume, there two types of zimbra volume: primaryMessage and secondaryMessage. But search any offcial documents and google, no clear information about it.

Any one can describe what does it mean?

Thanks a lot.

[Krishopper]

Secondary volumes are for HSM (Hierarchy Storage Management), which is used in the Network Edition to move older email to secondary storage.