Domain contain different metadata depending on their versions.
The important keys represent:
* Domain UUID
* SPM lease information
* Pool membership
* original device block size (So if someone moves the domain between devices 
with different block sizes we know that the domain broke)
* Domain human readable name
A master domain also contains pool information
* All members of the storage pool
* this version of the master MD
* pool human readable name

A lot of these key will be deprecated in future domain versions as long as the 
entire concept of storage pools. So If you are planning on writing tools that 
read the domain MD please be aware the the format\keys will drastically change 
in the next months.

----- Original Message -----
> From: "wangxiaofan" <>
> To:
> Sent: Thursday, February 2, 2012 1:58:06 AM
> Subject: [vdsm] metadata
> What is the metadata of non-master data domain used for? And master
> data domain?
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