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


blkmapd – pNFS block layout mapping daemon


blkmapd [-d] [-f]


The blkmapd daemon performs device discovery and mapping for the paral‐
lel 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 con‐
tent, 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.


-d Performs device discovery only then exits.

-f Runs blkmapd in the foreground and sends output to stderr (as
opposed to syslogd)


nfs(5), dmsetup(8)

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

Haiying Tang
Jim Rees

11 August 2011 blkmapd(8)

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