[Howto] update the firmware of HP Enterprise Mellanox ConnectX-2 EN NIC (671798-001)
Disclaimer: All liability is excluded. Be careful, you can brick your card. Important: you can’t use the firmware from HP 516937-B21 for the 671798-001, because all downloadable firmwares are for the 2-Port Version or for the wrong Board-Revision. So … Continued
[Howto] update the firmware of HP Enterprise SAS Expander (468406-B21)
Disclaimer: All liability is excluded. Be careful, you can brick your card. prerequisites: an Host-Bus-Adapter (e.g. LSI 9210-8i) #install the HBA and the SAS-Expander into your PC and connect both with an SFF8087-cable #download the needed tools (e.g. Debian … Continued
[Howto] migrate a bootable filesystem from UFS to mirrored ZFS
for example we use 2 new HDDs, which are called ada0 and ada1. Quick steps: you have to create 2 partitions on the new disks (1st for the zfs-bootloader, 2nd for the zfs itself) you have to set the first … Continued
[Howto] bond network interfaces in FreeBSD 10 (LAGG)
insert into /etc/rc.conf the following code: (e.g. 4x Intel NICs bond together in LACP-Mode) # tested under FreeBSD v10.x and v11.x ifconfig_igb0=”up” ifconfig_igb1=”up” ifconfig_igb2=”up” ifconfig_igb3=”up” cloned_interfaces=”lagg0″ ifconfig_lagg0=”laggproto lacp laggport igb0 laggport igb1 laggport igb2 laggport igb3 192.168.0.1 netmask 255.255.255.0″
[Facts] introduction for maxim integrated DS2482-800 chip (i2c to 1-wire interface)
short facts: supported i2c-speeds: Standard-Mode (100 kHz) and Fast-Mode (400 kHz) supported 1wire-speeds: Standard-Mode and Overdrive-Mode 8 independent 1-wire channels (1 active channel per-time, default-channel = 00) 8 possible i2c-adresses (selectable via 3 pins) supports 1-wire signal-optimization (3 possiblities: normal-resistor, … Continued
[Howto] set the speed of I²C-Bus from Raspberry Pi
to set the speed you have to load the module with the corresponding option for speed (e.g. for 32k Baudrate). list the actually loaded modules: lsmod unload the i2c-module: rmmod i2c_bcm2708 load the module with the speed-option: … Continued
[Comparison] optocoupler for triacs (with zero-crossing)
pricing from farnell-distributor (1 piece) all optocouplers with built-in zero-crossing (= usable with triacs) company modell I_FT in mA I_TM in mA V_DRM in V price in euro (01/2017) Vishay IL4118 1,3 300 800 4,55 Toshiba TLP3064 3,0 100 … Continued
[Howto] use GPIO from Raspberry Pi
the Linux-Kernel manages the GPIO-system under the path /sys/class/gpio. Use the following commands to manage the pins (e.g. GPIO 17): activate GPIO 17: echo 17 > /sys/class/gpio/export deactivate GPIO 17: echo 17 > /sys/class/gpio/unexport configure GPIO 17 as … Continued
[Howto] configure your Grandstream phone for Sipgate VoIP
the minimal working configuration for an sipgate.de SIP-Account is: SIP Server = sipgate.de SIP User ID = <enter-your-user-id-here> SIP Authenticate ID = <enter-your-user-id-here> SIP Password = <enter-your-password-here> Now the phone can register itself through the SIP-protocol at your provider, e.g. … Continued
[Howto] send disk to idle / standby OR set idle / standby timer (FreeBSD)
you can use the CAM-Subsystem from FreeBSD to control your disks. list available disks: camcontrol devlist list disk-information about disk /dev/ada0: camcontrol identify /dev/ada0 send disk /dev/ada0 to idle state: camcontrol idle /dev/ada0 send disk /dev/ada0 to standby state: camcontrol … Continued