I want to network 6-7 servers together.

D.r. Hp proliant dl320 g6 xeon e5502 4hd...
July 29, 2011 at 05:34:59
Specs: CentOS, Intel 5520/ 16 GB
I am interested in using several servers together to use as a load for testing purposes. I would like to make it as simple as possible and just want all the CPU's and RAM running to load the power supplies. I would like the simplest possible solution on the onset. I cannot connect the servers to the company network without installing a proxy - so would rather not connect them to the company network.

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July 29, 2011 at 05:44:48
Just plug them into a switch that isn't connected to anything else. Or do I misunderstand your question?

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July 29, 2011 at 05:50:32
Thanks for an answer - mind you I am not familiar with Networking but am rather interested in power management of the a benchmark rack of 6 servers I have collected - 1 Dell R610, 3 Dell R310, 1 HP DL320 G6 E5503, 1 HP DL320 G6 L5609, 1 IBM X3250. I have put CentOS on a couple of the servers, but a couple of them do no have DVD drives, so I am at a lose of how to load an OS on them.

Ideally I would like to run something like stress on them to load the CPU and memory of each server - but I would like to have them networked to effectively load them easily.

Would using a switch enable me to load OS's on the other servers and also be able to initiate stress, unless you could suggest another way to use the most energy on each server to load the power supplies and hence the power management which I will be benchmarking.

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July 29, 2011 at 08:21:31
If you're simply trying to measure how much electricity is used by the aforementioned servers, you do not need to network them together.

Plug them all into the same PDU (power distribution device) and measure how much they use.

Most of the PDU's we use in our server racks actually have an LED display that tells you how many amps are being used by all devices plugged into that PDU.

As far as "stressing" the servers goes, have them all perform a disk defrag at the same time. That will max out the disk(s) and should load up the CPU.

Loading up the CPU and HDD's of the servers won't increase the load on the PSU's. That should remain constant unless you change hardware. For example, put a high performance gaming video card in, or two in SLI. Short of changing hardware, the load on the PSU's won't differ.

Also, you need to check and see what kind of PSU's are in the servers. In a typical dual PSU setup, one is a redundant and it will have minimal load. Which is to say, using just enough power to make the LED light green on the back of the PSU. The load of the running hardware inside the server will be on the primary PSU. I've seen a few blade type servers that have 3 PSU's. Two that "load share" and one redundant backup.

It matters not how straight the gate,
How charged with punishments the scroll,
I am the master of my fate;
I am the captain of my soul.

***William Henley***

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August 5, 2011 at 06:12:49
thanks for the suggestions, I ended up putting the OS on a USB pendrive and installed it that way. I will install stress or maybe write a little script to write to the harddrive and then defrag - write, read, erase, defrag.

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