NAME
lctl - Low level Lustre filesystem configuration utility
SYNOPSIS
lctl
lctl --device <devno> <command [args]>
DESCRIPTION
lctl is used to directly control Lustre via an ioctl interface,
allowing various configuration, maintenance, and debugging features to
be accessed.
lctl can be invoked in interactive mode by issuing lctl command. After
that, commands are issued as below. The most common commands in lctl
are dl , device , network <up/down> , list_nids , ping nid , help ,
quit.
To get a complete listing of available commands, type help at the lctl
prompt. To get basic help on the meaning and syntax of a command, type
help command Command completion is activated with the TAB key, and
command history is available via the up- and down-arrow keys.
For non-interactive use, one uses the second invocation, which runs
command after connecting to the device.
Network Configuration
network <up/down>|<tcp/elan/myrinet>
Start or stop LNET, or select a network type for other lctl LNET
commands
list_nids
Print all Network Identifiers on the local node. LNET must be
running.
which_nid <nidlist>
From a list of nids for a remote node, show which interface
communication will take place on.
ping <nid>
Check LNET connectivity via an LNET ping. This will use the
fabric appropriate to the specified NID.
interface_list
Print the network interface information for a given network
type.
peer_list
Print the known peers for a given network type.
conn_list
Print all the connected remote NIDs for a given network type.
active_tx
This command should print active transmits, and it is only used
for elan network type.
route_list
Print the complete routing table.
Device Selection
device <devname>
This will select the specified OBD device. All other commands
depend on the device being set.
device_list
Show all the local Lustre OBDs. AKA dl
Device Operations
conf_param <device> <parameter>
Set a permanent configuration parameter for any device via the
MGS. This command must be run on the MGS node.
activate
Reactivate an import after deactivating, below.
deactivate
Deactivate an import, in particular meaning do not assign new
file stripes to an OSC. This command should be used on the OSC
in the MDT LOV corresponding to a failed OST device, to prevent
further attempts at communication with the failed OST.
abort_recovery
Abort the recovery process on a restarting MDT or OST device
Virtual Block Device Operation
Lustre is able to emulate a virtual block device upon regular file. It
is necessary to be used when you are trying to setup a swap space via
file.
blockdev_attach <file name> <device node>
Attach the lustre regular file to a block device. If the device
node is not existent, lctl will create it - it is recommended to
create it by lctl since the emulator uses a dynamical major
number.
blockdev_detach <device node>
Detach the virtual block device.
blockdev_info <device node>
Acquire which lustre file was attached to the device node.
Debug
debug_daemon
Start and stop the debug daemon, and control the output filename
and size.
debug_kernel [file] [raw]
Dump the kernel debug buffer to stdout or file.
debug_file <input> [output]
Convert kernel-dumped debug log from binary to plain text
format.
clear Clear the kernel debug buffer.
mark <text>
Insert marker text in the kernel debug buffer.
filter <subsystem id/debug mask>
Filter kernel debug messages by subsystem or mask.
show <subsystem id/debug mask>
Show specific type of messages.
debug_list <subs/types>
List all the subsystem and debug types.
modules <path>
Provide gdb-friendly module information.
OPTIONS
The following options can be used to invoke lctl.
--device
The device to be used for the operation. This can be specified
by name or number. See device_list
--ignore_errors | ignore_errors
Ignore errors during script processing
EXAMPLES
# lctl
lctl > dl
0 UP mgc MGC192.168.0.20@tcp bfbb24e3-7deb-2ffa-
eab0-44dffe00f692 5
1 UP ost OSS OSS_uuid 3
2 UP obdfilter testfs-OST0000 testfs-OST0000_UUID 3
lctl > dk /tmp/log Debug log: 87 lines, 87 kept, 0 dropped.
lctl > quit
# lctl conf_param testfs-MDT0000 sys.timeout=40
BUGS
Please report all bugs to Sun Microsystems, Inc.
http://bugzilla.lustre.org/
AVAILABILITY
lctl is part of the Lustre(7) filesystem package and is available from
Sun Microsystems, Inc.
http://www.sun.com/software/products/lustre/index.xml
SEE ALSO
Lustre(7), mkfs.lustre(8), mount.lustre(8), lctl(8), lfs(1)