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DC61 19" 6U Rackmount Cluster / 6 Nodes (Subrack & 6 x Trays) 664mm DEEP
Chassis DC61
Good alternative equivalent to traditional 1U rackmount servers. Uses regular Micro-ATX architecture and memory modules while building a high density server cluster. Chassis DC61 is 6U height and include 6 independent nodes each equivalent of 1U arcitecture, but with perfect cooling in contrast to 1U chassis. With all this going on, the DC61 is cheaper than six equivalent chassis of 1U. The final product (server) can be even cheaper than equivalent server in chassis of 1U as there is appearance to use regular non-proprietary, therefore low cost, components. Each node has its own power supply, processor, memory and hard drive units. Since subrack does not use a power supply back plane and each tray provides independent power connector for each node, you can remove any node without shutting down other node. Subrack and Trays are specially designed to offer you more flexibility for your application needs. In other words, cluster nodes are completely independent of each other. And more. You can have different configuration of nodes installed in the same subrack. You can mix and match different type of nodes in the same cluster.

Typical uses for the DC61 include high-powered multi-processor clustering, rendering server farms, security analysis, telecoms, as well as a dedicated server and for web hosting.
Form Factor
6U subrack with 6 x trays support for standard Micro-ATX (244x244mm) motherboard
Height: 226mm
Width: 483mm
Depth: 664mm
Net weight: less than 38kg
Expansion slots (in each tray)
- 3x Low Profile PCI expansion slots (lower than 52.5mm)
- 1x Full-height PCI expansion slot with using riser card
Drive Bays (in each tray)
- 2x HDD bay in shock-resistant fixed cage with snubbers. Extended up to 4 by additional fixed HDD cage 2HDC61
Front Panel (in each tray)
- Hard drive activity
- Power
- Alarm
- Reset
- Power

Detailed description
Operating Environment (System)
Operating Temperature Range: +5~50ºC
System Cooling
- 8x 92x92x25 2500RPM subrack's fans,
 11.44m3/min total air flow controlled by intelligent cooling system FanMagic8® and powered by AC/DC adaptor GPSU40B-3
- 1x 60x60x25 4000RPM fan in each tray,
 3.42m3/min air flow
Power Supply (in each tray)
PSU 300W 350W 400W 500W
Input Voltage 220VAC 220VAC 220VAC 115~
+3.3V 20A 22A 30A 28A
+5V 20A 21A 28A 30A
+5V standby 2A 2A 2A 2.5A
-5V 0.3A 0.3A 0.3A -
-12V 0.8A 0.8A 0.8A 0.5A
Height: 300mm
Width: 510mm
Depth: 770mm
Gross weight: less than 45kg (5kg-pallet)
Available Colors
 RAL9005 Black

Ordering Information Part number Description
Power Supply DC61300
Ethernet port option DC61350-E
350W, Fanmagic8-E (Ethernet) controller
350W, FanMagic8 (w/o Ethernet) controller
Remote Reboot Solution option DC61350-R
350W, Remote Reboot Solution
350W, NO Remote Reboot.
Optional Parts List Model Description
PCI riser card Sorry, it's coming soon 1.5U riser changes the insert direction of the slot by -90 degrees. more>>
PCIe riser card 1U5L-e1 1.5U PCI Express x1 riser card changes the insert direction of the slot by -90 degrees. more>>
1U5L-e4 1.5U PCI Express x4 riser card changes the insert direction of the slot by -90 degrees. more>>
2xHDD cage 2HDC61 2xHDD shock-resistant fixed cage(holder) with snubbers. more>>
4xHDD cage 4HDCM61 4xHDD 2.5" shock-resistant fixed cage(holder) with snubbers. more>>

Computer in the DC61 tray Technical drawing
of the DC61 tray
Technical drawing of the DC61
subrack with trays
Computer in the DC61 tray Technical drawing of the DC61 tray Technical drawing of the DC61 subrack with trays
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Chassis, standard set Subrack, front view Chassis, back view Tray Tray, back view Tray with additional HDD cage 2HDC61
Tray with additional HDD cage 4HDCM61 Intel® Xeon® system in tray Intel® P4 system with CPU cooler 45mm AMD Athlon® system with cooler AK-392 Intel® Xeon® system with CPU cooler 45mm PCIe x1 I/O card on riser card 1U5L-e1 in tray PCIe x4 I/O card on riser card 1U5L-e4 in tray
Smart Air Cooling of the Subrack (FanMagic8)
The subrack has 8 cooling fans of 92x25mm all drived by FanMagic8® that is a hardware-firmware device. The FanMagic8 realizes a temperature-based switch mode automatic-fan-speed control with 2 independent channels and 2 fan speed vs temperature profiles which correspondent to the channels. The FanMagic8 requires no special software and implements thermal management according to its own firmware.
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The DC61 Fan Panel View
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The DC61 Internal View
All cooling fans are hot swappable and due to the quantity of fans and air performance are redundant for DC61's applications the FanMagic8 prowiding diagnostic increases reliability of cooling system essentially, while fan speed-down at low temperature increases fan life, decreases energy consumption and decreases acoustic noise. Two thermistors (red circle marked) and FanMagic8 controller realize separated regulation of cooling fans for two independent airflows.

The FanMagic8 measures the temperatures for both Channels A and B and control the speed of attached fans based on those temperatures. Temperature data are converted from remote thermal sensing elements - thermistors and translated into a fractional (step 5%) fan speed from 0% to 100% according to pre-charted profile. Each Channel drives up to 4A load for 4 standard 12VDC 80mm fans with 3-rd wire (tacho-generator) and provides regulation by Pulse Width Modulation (PWM) from 0% to 100%. 0% PWM in the profile allows to shut the fans off for the temperature or up to a certain temperature, and then turn them on starting at a certain speed, and then ramp fan speed in response to temperature, and change the slope of the ramp once the temperature passes another threshold according to the profile. The profile is a user defined graph of fan speed (0-100%) vs temperature.

There are two options for the DC61 fan controller - FanMagic8 and FanMagic8-E!

FanMagic8 realises remote monitoring and control through the following interfaces:

  • Serial, 3V logic level, it is base interface for all FanMagic8 family
  • Serial, -12V..+12V RS232, just for "R" option (FanMagic8-R) supplied with the DC61 on request
  • Ethernet BASE-10T, just for "E" option (FanMagic8-E) supplied with the DC61 on request

FanMagic8-E is supplied as option. Please, order FanMagic8-E together with the DC61 chassis!

The principle of controller operation is frequent measuring (3 times per second) and analysing of airflow temperature and rotation speed of attached fans as well as generating of the voltage applied to the fan according to preliminary charted matrix. The temperature interval step is 2ºC. The PWM step is 5%. The value of PWM that is associated with temperature interval could be changed and regulation curve could be mould individually. PWM value determines fan power and finally the rotation speed (RPM).

Measured values of the RPM are compared with tabulated points (individually for each fan). Normally functioning fan should not have the rotation speeds lower than threshold matrix values. In presented example the measured value of temperature (32ºC) and PWM value 60% determine the threshold rotation values for 1st, 2nd, 3rd and 4th fan as 1400, 2200, 4000 and 4100 correspondingly. Even if one of fans has rotation speed lower than pre-charted threshold value, the FanMagic8 detects it as a fault, chimes, lights the LED (optional) and redefines PWM as 100%. Thus, early diagnostics of fan failure is assured at the time when rotation (and cooling) ability still is not lost but fault has been detected and signalized. If quantity of fans and air performance are redundant, the early diagnostics allows to increase reliability of cooling system essentially, while fan speed-down at low temperature increases fan life and decreases acoustic noise of the most unreliable and noisy element of modern electronics – cooling fan.

The FanMagic8 provides a PWM output for regulating fan speed. This low-frequency signal (~4 Hz to 100 Hz) adjusts the fan rotations per minute by cycling the fan motor on and off via an adjustable duty cycle. Duty on to duty cycle is PWM value ~0% to 100%. Chopped by PWM the power is applied to the fan through the Channel Driver (A and B).

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Both tables of matrixes for both Channels are placed in nonvolatile memory and there are some ways for their corrections if needed. The picture on the left shows the screenshot for FanMagic8-E and Channel A profile as a user defined graph of fan speed (0-100%) PWM vs temperature table. Just remember that there is no recommended PWM of 5% and 10% since many fans don’t like to be run with that little power.

The FanMagic8 (matrix) can be tuned up to determine individual handling characteristic both for PWM temperature characteristic and for attached fan behaviour in real use environment. Reducing of the fan speed as the temperature drops minimizes the system acoustic noise, prolongs fans service life period, diminishes power consumption. The FanMagic8 assures early diagnostics of fan failures and increases reliability of hardware functioning due to the overall monitoring of cooling system and signalling in case of failures. The use of the FanMagic8 combined with the DC61 cooling system which has redundant cooling facilities allows to design fault-tolerant system with long-life performance.

Remote Reboot Solution

The DC61 that is equipped with the FanMagic8-E and OpticReset6 board could be used as Remote Reboot solution for any DC61's server with just a few clicks. It means than the solution does not require the physical presence of people to reboot a remote frozen computer. The OpticReset6 board is logic level controlled switch which pushes the reset button by closing the contacts on your controlled device (Motherboard).

Here below is shown the OpticReset6 board which contains 6 infrared LEDs and is used as option for the DC61 cluster chassis.

The OpticReset6 board is connected to the FanMagic8-E by 10-wires ribbon cable. Hereby, we have 6 free space optic channels with narrow-beam infraread emitters. Of course, to get it done the DC61's tray has to be equipped with phototransistor. Also, you have to connect phototransistor to the motherboard as reset button keep correct polarity.

Such phototransistors are placed exactly opposit each of 6 LEDs (as shown in red oval on the right picture). The phototransistor acts as controlled switch. Of course, you have to connect phototransistor to the motherboard as reset button keep correct polarity.

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The FanMagic8-E realises webserver with AJAX to generate dynamic screens with data exchange and control. You can easily control or monitor the DC61 cooling system and provide remote reboot from your computer, tablet or smartphone from anywhere in the world. Using a common web browser, data can be made available to any user with a network connection. Just look at the screenshot on the right picture:

Of course, you can supervise your server by dedicated software and automatically reboot upon failure.

Remote Reboot Solution is supplied as option. Please, order Remote Reboot Solution together with the DC61 chassis!
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CPU Cooler installation and airflow direction
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Attention! There is 3.8mm clearance between the bottom and the mboard (look at the picture Riser Card..installation below). But some CPU coolers (especially from Intel® CPU with cooler box) deform mboard as much that can cause short-circuiting of jut out conductors of components i.e. VRM modules or so on. Use a non-conductive self-adhesive bumpone (3M-SJ-5076) to prevent the mboard from short-circuiting (look at the left photo). Stick the bumpon on the bottom under CPU (the chassis has four rectangular holes there) but aside the possible soldered SMD components on the mboard.

Install the CPU as instructed in manuals. Please remember to apply the thermal grease on the CPU, otherwise the CPU will overheat.

The CPU is cooled from a low profile active (heatsink with fan) cooler which has been blown both by blast from its own fan and by blast from subrack fans. Also remember that the subrack fans and tray fans exhaust air from the DC61 chassis. If your CPU cooler blows in appointed direction then it must be installed in a way that it blows in the same direction as other DC61 fans.

Leave airflows inside the DC61 tray free from wires, memory modules etc. Slightly bend the motherboard power connector's wiring (as shown left) to ensure a better fit. Do not bend these wires when the connector is plugged into the motherboard. Doing so will damage the motherboard. Repeat for 12V auxiliary power cable. Put all cable ties down to minimize airflow resistance. Adjust the airflows of cool and warm air outside of the DC61 subrack with corresponding airflows inside the DC61.

Low profile I/O card installation
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More and more card manufacturers are reducing the size of add-on cards to be compatible with the low-profile PCI (PCIe) standard. Unfortunately the DC61 tray does not fit a standard low-profile card in full measure. The add-on card should be 52.5mm height and lower while a standard low-profile card can be up to 72mm height. In oder to install add-on card the first step is to replace the metal bit (bracket) at the end of the card. The one supplied with the card will not fit into a DC61 tray. Of course, you can cut excess part away and drill mount hole in standard bracket; at the same time we provide a smaller version brackets for the most popular cards. In this case it is easily replaced only with the help of screwdriver. The DC61 tray front panel provides 3 low-profile card slots. The add-on card can be plugged into position-7, position-6, position-5 on the Micro-ATX system board (counting from the slot farthest from the CPU starting from 4). Note! Position-4 is not available for use. Also, you should cutout some metal connection straps on the back side of chassis by nipper. You should cutout only those connection straps that would interfere with panel connectors. To make it easier, the connector zone of tray front side has been made netlike.

Full-height I/O card installation with Riser Card PCI (1R5L) or PCIe (1U5L-e1, 1U5L-e4)
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Only one full-height card can be installed in DC61 tray using riser card. Riser cards 1R5L (PCI), 1U5L-e1 (PCIe x1) and 1U5L-e4 (PCIe x4) are used to change the insert direction of I/O card to the slot of motherboard by 270 degrees. The I/O card is plugged into the riser card and resides parallel with the motherboard. The PCI riser card can be plugged only into the fixed positions on the motherboard. It is important to consider this when selecting a motherboard. Picture at the left shows the slots location on a 4-slots standard Micro-ATX form factor board (starting from the left counting from the 4): PCI (PCIe) slot-4, slot-5, slot-6 and PCIe (or AGP) slot-7. The riser card 1R5L, 1U5L-e1 or 1U5L-e4 has a slot at the necessary height and should be attached to position-6, position-5 or position-4 on the system board (counting from the slot farthest from the CPU starting from 4-th). You can't attache the full-height card to the position-7 because of CPU presence.

Keep in mind that your motherboard should have PCI (PCIe) slot at required position in order to provide riser card plugging in required position.

I/O card should be fastened in chassis with an additional holder (look at the photo below). First fasten holder with a screw and a nut M3. The holder you have to install outside back panel in one of three holes (the holder on the photo is installed in the middle hole). Install riser card in the slot and then install and fasten I/O card.

Also, keep in mind a safe space between components on both surfaces of I/O card and the rest components of your system (especially between CPU cooler or memory modules). Use a non-conductive self-adhesive bumpone to prevent the I/O card from short-circuiting with components of your system or elements of the chassis.

Riser card is supplied as option, but it is advisable to order required riser card together with chassis.

Cooling Fan Fast Swapping
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Cooling fan service in subrack

Installation into Rack
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