blkmapd (8) - Linux Man Pages
blkmapd: pNFS block layout mapping daemon
NAMEblkmapd - pNFS block layout mapping daemon
SYNOPSISblkmapd [-h] [-d] [-f]
DESCRIPTIONThe 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.
- Display usage message.
- Performs device discovery only then exits.
- Runs blkmapd in the foreground and sends output to stderr (as opposed to syslogd)
Haiying Tang <Tang_Haiying [at] emc.com>
Jim Rees <rees [at] umich.edu>
SEE ALSOnfs(5), dmsetup(8)
RFC 5661 for the NFS version 4.1 specification.
RFC 5663 for the pNFS block layout specification.