LEDCTL(8) - Linux man page online | Administration and privileged commands

Intel(R) LED control application for a storage enclosures.

February 2018
ledctl(8) Intel(R) Enclosure LED Control Application ledctl(8)


ledctl - Intel(R) LED control application for a storage enclosures.


ledctl [OPTIONS] pattern_name=list_of_devices ...


The ledctl is an user space application designed to control LEDs associated with each slot in an enclosure or a drive bay. The LEDs of devices listed in list_of_devices are set to the given pattern pattern_name and all other LEDs are turned off. User must have root privileges to use this application. There are two types of systems: 2-LEDs systems (Activity LED, Status LED) and 3-LEDs systems (Activity LED, Locate LED, Fail LED). The ledctl application uses SGPIO and SES-2 protocol to control LEDs. The program implements IBPI patterns of SFF-8489 specification for SGPIO. Please note some enclosures do not stick close to SFF-8489 specification. It might happen that enclosure's processor will accept an IBPI pattern but it will blink the LEDs at variance with SFF-8489 specification or it has limited number of patterns supported. LED management (AHCI) and SAF-TE protocols are not supported. The ledctl application has been verified to work with Intel(R) storage controllers (i.e. Intel(R) AHCI controller and Intel(R) SAS controller). The application might work with storage controllers of other vendors (especially SCSI/SAS controllers). However, storage controllers of other vendors have not been tested. The ledmon application has the highest priority when accessing LEDs. It means that some patterns set by ledctl may have no effect if ledmon is running (except Locate pattern). The ledctl application is a part of Intel(R) Enclosure LED Utilities. Pattern Names The ledctl application accepts the following names for pattern_name argument according to SFF-8489 specification. locate Turns Locate LED associated with the given device(s) or empty slot(s) on. locate_off Turns only Locate LED off. normal Turns Status LED, Failure LED and Locate LED off. off Turns only Status LED and Failure LED off. ica or degraded Visualizes "In a Critical Array" pattern. rebuild Visualizes "Rebuild" pattern. ifa or failed_array Visualizes "In a Failed Array" pattern. hotspare Visualizes "Hotspare" pattern. pfa Visualizes "Predicted Failure Analysis" pattern. failure or disk_failed Visualizes "Failure" pattern. ses_abort SES-2 R/R ABORD ses_rebuild SES-2 REBUILD/REMAP ses_ifa SES-2 IN FAILED ARRAY ses_ica SES-2 IN CRIT ARRAY ses_cons_check SES-2 CONS CHECK ses_hotspare SES-2 HOT SPARE ses_rsvd_dev SES-2 RSVD DEVICE ses_ok SES-2 OK ses_ident SES-2 IDENT ses_rm SES-2 REMOVE ses_insert SES-2 INSERT ses_missing SES-2 MISSING ses_dnr SES-2 DO NOT REMOVE ses_active SES-2 ACTIVE ses_enable_bb SES-2 ENABLE BYP B ses_enable_ba SES-2 ENABLE BYP A ses_devoff SES-2 DEVICE OFF ses_fault SES-2 FAULT ses_prdfail SES-2 PRDFAIL Patterns Translation When non SES-2 pattern is send to device in enclosure automatic translation is being done. locate locate is translated to ses_ident locate_off locate_off is translated to ~ses_ident normal or off normal or off is translated to ses_ok ica or degraded ica or degraded is translated to ses_ica rebuild rebuild is translated to ses_rebuild ifa or failed_array ifa or failed_array is translated to ses_ifa hotspare hotspare is translated to ses_hotspare pfa pfa is translated to ses_prdfail failure or disk_failed failure or disk_failed is translated to ses_fault List of Devices The application accepts a list of devices in two formats. The first format is a list with comma separated elements. The second format is a list in curly braces and elements are separated by space. See examples section bellow for details. A device is a path to file in /dev directory or in /sys/block directory. It may identify a block device, a RAID device or a container device. In case of a RAID device or a container device a state will be set for all block devices associated, respectively. The LEDs of devices listed in list_of_devices are set to the given pattern pattern_name and all other LEDs are turned off (unless --listed-only option is given).


-l or --log=path Sets a path to local log file. If this option is specified the global log file /var/log/ledctl.log is not used. -h or --help Prints this text out and exits. -v or --version Displays version of ledctl and information about the license and exits. -L or --list-controllers Prints information (system path and type) of all controllers detected by ledmon and exits. -x or --listed-only With this option ledctl will change state only on devices listed in CLI. The rest of devices will not be touched.


/var/log/ledctl.log Global log file, used by all instances of ledctl application. To force logging to user defined file use -l option switch.


The following example illustrates how to locate a single block device. ledctl locate=/dev/sda The following example illustrates how to turn Locate LED off for the same block device. ledctl locate_off=/dev/sda The following example illustrates how to locate disks of a RAID device and how to set rebuild pattern for two block devices at the same time. This example uses both formats of device list. ledctl locate=/dev/md127 rebuild={ /sys/block/sd[a-b] } The following example illustrates how to turn Status LED and Failure LED off for the given device(s). ledctl off={ /dev/sda /dev/sdb } The following example illustrates how to locate a three block devices. This example uses the first format of device list. ledctl locate=/dev/sda,/dev/sdb,/dev/sdc


Copyright (c) 2009-2017 Intel Corporation. This program is distributed under the terms of the GNU General Public License as published by the Free Software Foundation. See the built-in help for details on the License and the lack of warranty.


ledmon(8), ledmon.conf(5)


This manual page was written by Artur Wojcik <>. It may be used by others.
LEDCTL Version 0.90 February 2018 ledctl(8)
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ledctl(8) referred by ledmon(8) | ledmon.conf(5)
refer to ledmon(8) | ledmon.conf(5)
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Main page Intel(R) Enclosure LED Control Application (+1) LEDCTL Version 0.90 (+1) № 8 (+5755)
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