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>
This page is part of the nfs-utils (NFS utilities) project. Information about the project can be found at ⟨http://linux-nfs.org/wiki/index.php/Main_Page⟩. If you have a bug report for this manual page, see ⟨http://linux-nfs.org/wiki/index.php/Main_Page⟩. This page was obtained from the project's upstream Git repository ⟨git://git.linux-nfs.org/projects/steved/nfs-utils.git⟩ on 2023-06-23. (At that time, the date of the most recent commit that was found in the repository was 2023-06-12.) If you discover any rendering problems in this HTML version of the page, or you believe there is a better or more up-to-date source for the page, or you have corrections or improvements to the information in this COLOPHON (which is not part of the original manual page), send a mail to firstname.lastname@example.org 11 August 2011 blkmapd(8)
Pages that refer to this page: nfs.conf(5)