@DustinB3403 The drive is not being shared and is only being used locally until a local task copies those files over to the backup server

@DustinB3403 I am not sure how that is applicable given the facts above. If that was the case, the drive being disconnected would not affect this.

This drive is just being used as a temporary location for backups before they are shuffled over the network to our backup server.

so we have 3 servers this is affecting. Boot time is 25 minutes for server 1, and 45 minutes for server 2 & 3. Server 2 & 3 have taken up to 2 hours to boot at times. The server is hanging on the Windows Loading screen (Circling dots).

I was able to troubleshoot it this weekend, and have narrowed down the problem to hardware configuration. We have RAIDs on all 3 of these servers, and have 1 additional storage drive on the same controller that is not part of any RAID. If I unplug this drive from the board, the boot time reduces to 2-3 minutes. Once you plug the extra drive back in, the boot time spikes back to 45 minutes.

Why would having an additional HDD connected to the onboard SATA controller cause this? Does anyone have any troubleshooting tips?

Server Motherboards

• Server 1 - SuperMicro X9DR3-LN4F+
• Server 2 - Tyan S2927G2NR-E
• Server 3 - Tyan S2925A2NRF-E

Sata Controller / Chipsets

• LSI MegaRAID LSI00331 (9271-8i) PCI-Express 3.0 x8
• NVIDIA NFP3400
• NVIDIA NFP3400

@Kelly I had tried the OWA App. Ill give Outlook a shot. Thanks!

@thecreativeone91 Thanks I will try it out

@MattSpeller Thanks. I will give it a try

I have been casually looking around for a better Exchange Client for my Android phone and have tried a handful of apps, but none of them have suited my needs. It seems like I either have not came across the one used by most professionals, or I have some unrealistic expectations of functionality. Any ideas you awesome people out there?

My most important need is the first one, the rest are all wants.

• Favorite specific folders (Or jump to recently viewed folders).
• Specify which folders should trigger a notification
• Specify different Sync Settings per folder. One folder use push, rest check every 10-15 minutes, etc (Trying to reduce data usage)
• Specify different Alerts for different folders

I know it has been a while since I last updated, but we finally came to a resolution a few weeks ago and I haven't had a chance to update yet.

And....... it completely disappeared without a trace. haha well that is typically my luck so I wasn't too surprised.

We were able to walk around with the equipment and a laptop across the entire property, and believe we did identify the cause as our next door neighbors. They are a medical facility with some MRIs, so maybe their equipment was failing and they replaced a part.

One piece of additional information, I was able to have some really good conversations with their tech support and learned that they do have internal filters for 60Hz so that explains the absence of a 60Hz signal. I appreciate all the help from everyone on this forum. It was my beacon of light in a sea of confusing data.

Hope you guys are having a good April 1st. Don't trust everything you read

@MattSpeller awesome. He is receptive and will take care of that this weekend or Monday. I am open to any ideas, I was also wondering if it might be a case of "dirty power" in the building? Maybe we have some feedback from the AC Units being sent back along the line? Since this happens in many different places in the building, maybe we could install something to "clean up" the power. Before today I always considered those power cleaners a scam, but this seems like the intended usage if I ever saw one

@MattSpeller so you think there may be a small break in the fiber that could be letting the EMI in, its just not bad enough to cause the unit to stop working?

Ill send this over to the user and ask him to try it

@MattSpeller

The models are:

Thought Technology: ProComp Infinity Model SA7500
J&J: I-330 C2 Plus

Thanks for the followup Matt.

I went through some of the logs of tests performed. When there was a transformer close, it definitely cycled every 60/120/180, but with everything turned off, this is what we see

He has spoken with the manufacturers of both devices and they have been of no help unfortunately. When I get the model#'s tomorrow, I will try to give them a call and see if we can have a detailed conversation about our options. I do not expect this to be productive as the user using this equipment is pretty intelligent and understands some of this better than I do and was not able to glean any information. I am very good at cutting through red tape and double talk from tech support, so maybe I will be able to get something helpful.

FYI he is usually using a desktop to perform these tests, and the problem is apparent on both the PC and laptop (Laptop is unplugged of course)

@MattSpeller said:

didn't really give what m

Thanks Matt. I appreciate the offer of help.
I have attached a screenshot from the monitoring software. Yes the 180Hz signal should not be present, or at least prevalent in the pictures. He is reading very low frequency electrical impulses and this signal is throwing off the tests.

He is sending me the model numbers of the equipment in the morning. In the meantime, could you help me pick out some ferrite cores that may be able to help filter this 180Hz (3rd Harmonic?) interference? I was about to order some, but then I noticed that there were different types for different frequencies, and I cant make heads or tails of which one I need.

Im talking to some of my EE friends from college, but they havent been of any significant help yet. I would like to pass this off to a professional qualified to deal with it, but I dont even know where to start. Any ideas?

any other ideas or suggestions guys? This is pretty far out of scope, and I have limited experience this deep in.

Also when I worked for the cable company we had "Signal Leakage" meters. Is there a similar meter that can assist me in pinpointing the source or direction the interference is coming from?

Well. No dice unfortunately

Tests performed:

• Turned off all other lights. Incandescent (no florescent) attached to 4 dimmer switches
• Turned off all other surge protectors
• Cell Phones turned off
• Unplugged all other electrical devices in room
• Replaced extension cable with shielded extension cable
• Wrapped unit in aluminum foil
• Wrapped Cables in aluminum foil
• Wrapped USB Extension cable join with built in cable and majority of built in cable with aluminum foil
• Wrapped Sensors and User's Hands in aluminum foil
• Moved Device to table where printer sits <~~Cut the 180Hz signal from 3 to 1.5
  • User reports similar results when walking around the building with laptop. Some places its not as bad, but it is always there
• Checked nearby offices for random items plugged in - None

Changes made:

• Moved all computer items to new surge protector, plugged into power cleaner
• Left shielded USB extension cables up there

Possible avenues

• Ask Maintenance to disconnect the power line running outside of the wall that is powering User's Cubicle Outlets and only use wall outlet
• Speak to Electrician to see if there are filters that can be placed in electrical room in case the whole building has "dirty power"
  • Would explain why User can reproduce this with the laptop (Running on Battery) in various places in the building, but it does not reproduce at his home.
• Bring in Professional (No idea what he would be a professional in)

Important Notes

• Problem is only existent when using sensors far apart from each other (more opportunity for EMI to get in the middle)
• Doesn't happen if sensors are 2 inches from each other on the same arm.
• Happens when 1 sensor on each hand and hands are shoulder-width apart
• Parking Garage Below Him - Maybe something to look into to? Wonder if there is any equipment below him?
• This is happening on both devices
  • J&J SEMG sensors
    • Sampling Rate = 1024 per second
  • Thought Technology SEMG
    • Sampling Rate = 2048 per second

Thanks. I'll give it a go and see the results. Ill update in a couple of days

@scottalanmiller We could try for testing, but that bag has to be 100% closed right? I assume if it wasn't, it would still block a majority of it

@g.jacobse Unfortunately I don't have the Model# available atm, but I can get it. There is definitely Florescent lights (I do think he turns most of them off when performing tests due to the nature of the relaxation techniques) Funny thing is that this began within the last 7-8 months, but I have spoken with maintenance, and nothing has been changed. Do you think a faulty ballast could be causing this?

I have already removed the laptop power adapter (definitely was causing some EMI), and have moved the equipment from everything we can. It is still near the computer, but 2 feet above it on the desk. What about shielded PSUs? They probably make those right?

@scottalanmiller I do not have much experience with it, but I think additional information will help.

The equipment is Biofeedback equipment. There are 2 different devices that attach probes to the surface of your skin in order to read the electrical impulses. They both output in Hz. I had been approaching it as the cables and probes picking up the interference, but I can approach it the other way as well. These are small handheld devices, approx. 10" x 6" x 4". What did you have in mind?

http://www.mayoclinic.org/tests-procedures/biofeedback/basics/definition/prc-20020004

Does anyone have any experience with EMI on sensitive devices? We have a Biofeedback device that measures in Hz. There is a 180Hz signal appearing on the readouts of 2 different devices. I do not have much experience with this, but I have already installed a Power Cleaner (Ha!) and shielded cables, but wanted to add some Ferrite Cores to some other related cables. I ran into a roadblock though: there are different types of ferrite cores for different frequencies you want to block and I don't know the differences. That is the extent of my knowledge about utilizing ferrite cores, so any help with recommendations and suppliers would be greatly appreciated