NAME | SYNOPSIS | DESCRIPTION | OPTIONS | CONFIGURATION FILE | SEE ALSO | AUTHORS | COLOPHON

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

NAME         top

       blkmapd - pNFS block layout mapping daemon

SYNOPSIS         top

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

DESCRIPTION         top

       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         top

       -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)

CONFIGURATION FILE         top

       The blkmapd daemon recognizes the following value from the [general]
       section of the /etc/nfs.conf configuration file:

       pipefs-directory
              Tells blkmapd where to look for the rpc_pipefs filesystem.
              The default value is /var/lib/nfs/rpc_pipefs.

SEE ALSO         top

       nfs(5), dmsetup(8), nfs.conf(5)

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

AUTHORS         top

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

COLOPHON         top

       This page is part of the nfs-utils (NFS utilities) project.
       Information about the project can be found at 
       ⟨http://linux-nfs.org/wiki/index.php/Main_Page⟩.  If you have a bug
       report for this manual page, see 
       ⟨http://linux-nfs.org/wiki/index.php/Main_Page⟩.  This page was
       obtained from the project's upstream Git repository 
       ⟨http://git.linux-nfs.org/?p=steved/nfs-utils.git;a=summary⟩ on
       2017-07-05.  If you discover any rendering problems in this HTML ver‐
       sion of the page, or you believe there is a better or more up-to-date
       source for the page, or you have corrections or improvements to the
       information in this COLOPHON (which is not part of the original man‐
       ual page), send a mail to man-pages@man7.org

                               11 August 2011                     blkmapd(8)

Pages that refer to this page: nfs.conf(5)