11 August 2011
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:
|Tells blkmapd where to look for the rpc_pipefs filesystem. The default value is /var/lib/nfs/rpc_pipefs.|