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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 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)
CONFIGURATION FILE
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
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
Haiying Tang <Tang_Haiying AT emc.com>
Jim Rees <rees AT umich.edu>
11 August 2011 blkmapd(8)
Generated by $Id: phpMan.php,v 4.55 2007/09/05 04:42:51 chedong Exp $ Author: Che Dong
On Apache
Under GNU General Public License
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