1blkmapd(8) System Manager's Manual blkmapd(8)
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6 blkmapd - pNFS block layout mapping daemon
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9 blkmapd [-h] [-d] [-f]
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12 The blkmapd daemon performs device discovery and mapping for the paral‐
13 lel NFS (pNFS) block layout client [RFC5663].
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15 The pNFS block layout protocol builds a complex storage hierarchy from
16 a set of simple volumes. These simple volumes are addressed by con‐
17 tent, using a signature on the volume to uniquely name each one. The
18 daemon locates a volume by examining each block device in the system
19 for the given signature.
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21 The topology typically consists of a hierarchy of volumes built by
22 striping, slicing, and concatenating the simple volumes. The blkmapd
23 daemon uses the device-mapper driver to construct logical devices that
24 reflect the server topology, and passes these devices to the kernel for
25 use by the pNFS block layout client.
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28 -h Display usage message.
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30 -d Performs device discovery only then exits.
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32 -f Runs blkmapd in the foreground and sends output to stderr (as
33 opposed to syslogd)
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36 The blkmapd daemon recognizes the following value from the [general]
37 section of the /etc/nfs.conf configuration file:
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39 pipefs-directory
40 Tells blkmapd where to look for the rpc_pipefs filesystem. The
41 default value is /var/lib/nfs/rpc_pipefs.
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44 nfs(5), dmsetup(8), nfs.conf(5)
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46 RFC 5661 for the NFS version 4.1 specification.
47 RFC 5663 for the pNFS block layout specification.
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50 Haiying Tang <Tang_Haiying@emc.com>
51 Jim Rees <rees@umich.edu>
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55 11 August 2011 blkmapd(8)