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       blkmapd - pNFS block layout mapping daemon


       blkmapd [-d] [-f]


       The blkmapd daemon performs device discovery and mapping for the parallel NFS (pNFS) block
       layout client [RFC5663].

       The pNFS block layout protocol builds a complex storage hierarchy from  a  set  of  simple
       volumes.   These  simple volumes are addressed by content, using a signature on the volume
       to uniquely name each one.  The daemon locates a volume by examining each block device  in
       the system for the given signature.

       The  topology typically consists of a hierarchy of volumes built by striping, slicing, and
       concatenating the simple volumes.  The blkmapd daemon uses  the  device-mapper  driver  to
       construct  logical  devices  that reflect the server topology, and passes these devices to
       the kernel for use by the pNFS block layout client.


       -d     Performs device discovery only then exits.

       -f     Runs blkmapd in the foreground and sends output to stderr (as opposed to syslogd)


       nfs(5), dmsetup(8)

       RFC 5661 for the NFS version 4.1 specification.
       RFC 5663 for the pNFS block layout specification.


       Haiying Tang <>
       Jim Rees <>

                                          11 August 2011                               blkmapd(8)