blkmapd(8) System Manager's Manual blkmapd(8)
blkmapd - pNFS block layout mapping daemon
blkmapd [-h] [-d] [-f]
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.
-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)
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.
nfs(5), dmsetup(8), nfs.conf(5) RFC 5661 for the NFS version 4.1 specification. RFC 5663 for the pNFS block layout specification.
Haiying Tang <Tang_Haiying@emc.com> Jim Rees <email@example.com>
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Pages that refer to this page: nfs.conf(5)