Lustre 1.6 Operations Manual

Device Operations
Option
Description
lctl get_param [-n]
Gets the Lustre or LNET parameters from the specified . Use the -n
option to get only the parameter value and skip the pathname in the output.
lctl set_param [-n]
Sets the specified value to the Lustre or LNET parameter indicated by the
pathname. Use the -n option to skip the pathname in the output.
conf_param
activate
deactivate
abort_recovery
Sets a permanent configuration parameter for any device via the MGS. This
command must be run on the MGS node.
Re-activates an import after the deactivate operation.
Running lctl deactivate on the MDS stops new objects from being allocated
on the OST. Running lctl deactivate on Lustre clients causes them to return -
EIO when accessing objects on the OST instead of waiting for recovery.
Aborts the recovery process on a re-starting MDT or OST device.
Note – Lustre tunables are not always accessible using procfs interface, as it is
platform-specific. As a solution, lctl {get,set}_param has been introduced as a
platform-independent interface to the Lustre tunables. Avoid direct references to
/proc/{fs,sys}/{lustre,lnet}. For future portability, use lctl {get,set}_param instead.
32-10 Lustre 1.7 Operations Manual • August 2008