![]() If running ledctl and ledmon concurrently, ledmon will eventually override the ledctl settings. # ledctl locate_off=/dev/rssda will turn off the locate LED ![]() ![]() # ledctl locate= will blink both drive LEDs # ledctl locate=/dev/rssda will blink drive LED IPMItool is a simple command line utility which is used to manage IPMI-enabled devices. # yum install OpenIPMI (or use rpm to install OpenIPMI/OpenIPMI-libs rpms directly) The functionality of IPMI can be accessed via IPMItool. Mine for instance comes with two LED indicators for each bay - one indicates that the disk is connected, the other indicated data traffic. Im sure many of the FreeNAS community members use some kind of hot-plug encasements. On Dell SSD systems using ledctl and ledmon requires the ipmi drivers to be loaded. However, what I am looking for is any kind of hardware support for disk (bay) identification. Ledctl can be used to identify an individual drive on a backplane, useful when determining which drive maps to which drive bay slot. Ledmon can be run as a daemon to constantly monitor the status of drives and Software RAID and set the drive LEDs appropriately. SLES11 SP2 however uses an older version of ledmon that must be updated in order to support Dell PCIE SSD devices. The latest ledmon package ships with RHEL6.3. According to the specification, there can be several states for drive LEDs: Ledmon uses the International Blinking Pattern Interpretation (IBPI) specification for displaying which state the drives are in. ![]() The activity LED is caused by drive activity, read or write. Normally drive backplane LEDs are controlled by a hardware RAID controller (PERC), but when using Software RAID on Linux (mdadm) for PCIE SSD, the ledmon daemon will monitor the status of the drive array and update the status of drive LEDs.ĭell systems use a three-LED status on their backplane. Note - The CPU and DIMM LEDs continue to indicate a failure until the system is powered on. CPU LEDs blink to indicate a failure, otherwise they stay Off. FIGURE 14-6 and TABLE 14-3 describe the internal LED and button locations. Ledmon and ledctl are two utilities for Linux that can be used to control LED status on drive backplanes. FIGURE 14-4 and FIGURE 14-5 show the disk drive and fan tray LEDs. ![]()
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