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>