bionic (8) blkmapd.8.gz

Provided by: nfs-common_1.3.4-2.1ubuntu5.5_amd64 bug

NAME
       blkmapd - pNFS block layout mapping daemon


SYNOPSIS
       blkmapd [-h] [-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 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.


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)