.TH lctl 1 "2003 Oct 8" Lustre "configuration utilities" .SH NAME lctl \- Low level Lustre filesystem configuration utility .SH SYNOPSIS .br .B lctl .br .B lctl --device .br .SH DESCRIPTION .B lctl is used to directly control Lustre via an ioctl interface, allowing various configuration, maintenance, and debugging features to be accessed. .B 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 .B dl , .B device , .B network .I , .B list_nids , .B ping .I nid , .B help , .B quit. To get a complete listing of available commands, type .B help at the lctl prompt. To get basic help on the meaning and syntax of a command, type .B help .I 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. .SS Network Configuration .TP .BI network " |" Start or stop LNET, or select a network type for other .I lctl LNET commands .TP .BI list_nids Print all Network Identifiers on the local node. LNET must be running. .TP .BI which_nid " " From a list of nids for a remote node, show which interface communication will take place on. .TP .BI ping " " Check LNET connectivity via an LNET ping. This will use the fabric appropriate to the specified NID. .TP .BI interface_list Print the network interface information for a given .B network type. .TP .BI peer_list Print the known peers for a given .B network type. .TP .BI conn_list Print all the connected remote NIDs for a given .B network type. .TP .BI active_tx This command should print active transmits, and it is only used for elan network type. .TP .BI route_list Print the complete routing table. .PP .SS Device Selection .TP .BI device " " This will select the specified OBD device. All other commands depend on the device being set. .TP .BI device_list Show all the local Lustre OBDs. AKA .B dl .PP .SS Device Operations .TP .BI conf_param " " Set a permanent configuration parameter for any device via the MGS. This command must be run on the MGS node. .TP .BI activate Reactivate an import after deactivating, below. .TP .BI 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. .TP .BI abort_recovery Abort the recovery process on a restarting MDT or OST device .PP .SS 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. .TP .BI blockdev_attach " " 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. .TP .BI blockdev_detach " " Detach the virtual block device. .TP .BI blockdev_info " " Acquire which lustre file was attached to the device node. .PP .SS Debug .TP .BI debug_daemon Start and stop the debug daemon, and control the output filename and size. .TP .BI debug_kernel " [file] [raw]" Dump the kernel debug buffer to stdout or file. .TP .BI debug_file " [output]" Convert kernel-dumped debug log from binary to plain text format. .TP .BI clear Clear the kernel debug buffer. .TP .BI mark " " Insert marker text in the kernel debug buffer. .TP .BI filter " " Filter kernel debug messages by subsystem or mask. .TP .BI show " " Show specific type of messages. .TP .BI debug_list " " List all the subsystem and debug types. .TP .BI modules " " Provide gdb-friendly module information. .SH OPTIONS The following options can be used to invoke lctl. .TP .B --device The device to be used for the operation. This can be specified by name or number. See .B device_list .TP .B --ignore_errors | ignore_errors Ignore errors during script processing .TP .SH EXAMPLES # lctl .br 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 .br lctl > dk /tmp/log Debug log: 87 lines, 87 kept, 0 dropped. .br lctl > quit .PP # lctl conf_param testfs-MDT0000 sys.timeout=40 .SH BUGS Please report all bugs to ClusterFileSystems, support@clusterfs.com .SH AVAILABILITY .B lctl is part of the .BR Lustre (7) filesystem package and is available from CFS .br http://clusterfs.com .SH SEE ALSO .BR Lustre (7), .BR mkfs.lustre (8), .BR mount.lustre (8), .BR lctl (8), .BR lfs (1)
