NAME¶
blkmapd - pNFS block layout mapping daemon
SYNOPSIS¶
blkmapd [-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¶
- -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>