blkmapd

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

NAME
       blkmapd - pNFS block layout mapping daemon

SYNOPSIS
       blkmapd [-h] [-d] [-f]

DESCRIPTION
       The blkmapd daemon performs device discovery and mapping for the paral-
       lel 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
       -h     Display usage message.

       -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)