blkmapd(8)						      System Manager's Manual							blkmapd(8)

NAME

       blkmapd - pNFS block layout mapping daemon

SYNOPSIS

       blkmapd [-d] [-f]

DESCRIPTION

       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 con-
       tent, 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.

OPTIONS

       -d     Performs device discovery only then exits.

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

SEE ALSO

       nfs(5), dmsetup(8)

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

AUTHORS

       Haiying Tang <Tang_Haiying@emc.com>
       Jim Rees <rees@umich.edu>

								  11 August 2011							blkmapd(8)