How does the metadata-server synchronizes with data-servers ?

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Hi, all.

I've succeeded to install pNFS-enabled kernel. But I wonder that how
does pNFS behaviour.
Especially, about synchronizations between the MetaDataServer and
DataServers.
I'd read a paper of the Calsoft's. This paper said like "There is
heartbeats betweenthe MetaDataServer and DataServers".
http://www.calsoftinc.com/download_pdf/White%20Papers%20-%20pnfs.pdf

When will this heartbeat be started ? The instruction below is not describe
about this, but the heartbeat will works, w'not this ?
http://wiki.linux-nfs.org/wiki/index.php/PNFS_Setup_Instructions

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