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  • Using Y split cables to connect two servers to a single PDU receptacle

    - by sagi
    We have bought a few 30amp 208v PDUs that only have 9 receptacles. The servers we are connecting to those PDUs will not use the full 30amps (at 80%, or actually 40% since we use redundant power) so we need to find a way to connect more than 9 servers to the same 9 receptacles so we'll be not wasting capacity that we pay for. I thought about using a Y split cable like this one: http://www.cablesandkits.com/power-cord-c14-c13-splitter-cable-awg-p-515.html That will let me connect two servers to a single receptacle. Each of the individual receptacles can provide 12 amps of power and individual servers are unlikely to consume more than 3 amps at maximal load so it should provide sufficient power. The question is if there is any other reason why this may be a bad idea and if there is any other solution other than buying PDUs with more receptacles (which I don't want to do because I must use horizontal PDU on these racks and ones with more receptacles consume more U space).

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  • Recommendation for a redundant 60V DC Powersupply

    - by Lairsdragon
    We have some Telco-Equipment in our data space center which we had been given by our Telco. What they didn't provide is a redundant power supply and therefore we are struggling with outages of this equipment. What I am searching for is a redundant Power-Supply for 60V and 600W 60 Volt DC output 600 Watts rated power 2 220V Input with galvanic separation Rack mountable Any suggestions?

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  • Eject a USB modem in the scheduled tasks

    - by mantra
    Hi I need to schedule a task to eject a USB modem immediately when the power fail. I had searched in EventLog and found the EventID for power Failure, put it in the Triggers,but in the Action I didn't know how to put what will eject the modem. Can anybody please help me on this, I need it urgently, because my system crash on the power failure because of the USB modem. I have a UPS but I have no suitable power cable for the modem ( couldn't find one in my country ). I run win7 Ultimate

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  • Motherboard on, but nothing will start

    - by Geeklat
    I'll try and be as clear as possible. Recently I purchased a barebones kit for my first attempt at a full PC assembly. I've gone through and connected all the parts correctly based on numerous examples that confirm everything is connected correctly. The motherboard and the video card are receiving power based on the fact that the motherboard's power LED is on and the video card has some LEDs on. Nothing else in the computer will come on when pressing the power button on the case. No fans, no hard drive, no CPU fan. Not even for a split second. I also receive no beeping noise from the speaker connected to the motherboard. I've also tried swapping the reset and power connectors from the front of the case to no luck.

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  • SMPS stops when I plug in a SATA drive?

    - by claws
    Hello, Part 1: my first question is all the 4 wire power connectors (intended for hardisks/dvd drives not mother board) are same. Right? I've been using all of them same and I had no problem for years. Yesterday I borrowed a SATA disk from my friend and connected it my computer using Sata Power adaptor (4 wire) and when I switched on the computer. There were fumes coming out of the connector. I immediately turned it off (in just one second). I tested the voltages in the 4 wire power connector of my SMPS: They were 5.3v & 12.2V. I couldn't measure the current. But my SMPTS label reads: DC Output: 3.3v (25A) +5v (32A) -5v (0.3A) +12V (17A) -12V (0.8A) And the SATA hardisk label reads Input: +5v (0.72A) +12V (0.52A) I'm shocked! I never noticed this. Does the "sata power adaptor" scale down the current to required? If it doesn't, I've been connecting same way for years. I never had any problem. This is the first time I'm encountering it. Part 2: I wanted to return the drive to my friend. He has two hard disks, SATA & PATA. Its the SATA that I borrowed. When he usually switches on. The CPU fan starts & then stops for a sec and starts again and continues working. That was the earlier situation. I don't know why it stops & starts? Well, Now when I connect this SATA disk and switch ON the computer. CPU fan starts (just for an instant, not even a 0.5 sec) and stops. It doesn't start again, I mean the power from SMPS has stopped. But if I disconnect this SATA disk. It works fine. What seems to be the problem? I've no idea about why there were fumes or why his SMPS starts & stops giving power? What is its relation with the SATA disk connection?

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  • Computer crashes and won't start, LED indicator blinks slowly

    - by hexacyanide
    I have a MSI K8NGM2-FID motherboard coupled with a AMD Athlon 3700+ and an Antec TPII-550 power supply. The computer crashes at random times in operation, sometimes taking a while to crash, and sometimes crashing right after Windows XP shows the desktop after boot. The CPU temperature is always in the safe range, usually 30-33 degrees Celsius, and swapping the RAM has not done anything, so the crashes aren't cause by the RAM. What could be causing this? If the motherboard were fried, would the computer even boot at all? What causes inconsistent crashing of the computer? After the computer crashes, the LED power indicator blinks about once a second, and the computer does not respond to the power button. This behavior continues until the computer's power supply is completely removed.

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  • Run a pc on battery for 3 days?

    - by Zen 8000k
    I am looking for a low power, low end pc able to run 24/7 without overheating and a way to support it in case of power failure. Power failures can be up to 72 hours. The pc dosen't need a monitor or keyboard. A modem must also be protected in case of power failure. When i say low end, i don't mean crap. The cpu needs to be x86 and have at least 1k cpu in this chart: http://www.cpubenchmark.net/index.php What's the best way to do this?

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  • Server only powers (but doesn't POST) when IDE drive is powered

    - by Jookia
    So after a thunderstorm last night which did a little damage, a Gigabyte server has decided it's going on power on but not POST. If it is POSTing, it's doing a very bad job at telling me. No beeps, nothing. Power seems to reach the components though. CD Drive opens and closes. So after stripping it back, I've found that the difference between this behaviour and deciding it's not going to power on for more than half a second, is having a power cable plugged in to one of the IDE hard drives. Is this normal, or a sign that the PSU has had it?

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  • Wireless USB keyboard and mouse can wake system, but then receiver is inactive

    - by BlueMonkMN
    I have a Microsoft brand USB device that acts as a receiver for a wireless Microsoft Keyboard and a wireless Mouse. When it's operating normally, there are LEDs on the device indicating Caps Lock, Num Lock and Function Lock, of which the latter 2 are usually lit. It is plugged into a Dell Isnpiron 531 with Windows 7 32-bit running on an AMD Athlon 64 X2 Dual Core processor 5000+. When the computer goes to sleep (the power indicator on the main box is flashing), I can wake it by moving the mouse. So far all is good. However, something changed in, I think, the past couple weeks (I suspect due to a Microsoft driver update problem). Before the change, after waking the computer, everything would operate normally as far as I could tell, but now after waking the computer, the receiver has no lights on, and the keyboard and mouse are completely unresponsive (which is odd, considering the mouse woke up the computer). There is a button on the receiver that's supposed to reset the wireless connection and flash the lights while it does so, but it has no effect in this state. It's like the receiver doesn't have power (but how would the system know I moved the mouse, unless the power was on until it woke up?). I have checked the BIOS/CMOS settings or whatever you call them, and did not see anything related to USB in the power management section. I have checked Windows 7 device manager and ensured that all the USB Root Hub devices have the setting unchecked for allowing the USB power to be turned off. Like I said, this was working before, and the only thing I can think of that's changed is applying Windows Updates.

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  • would unexpected power cuts harm the Linux OS?

    - by Johan Elmander
    I am developing an application on a Linux embedded board (runs Debian) e.g. Raspberry Pi, Beagle Board/Bone, or olimex. The boards works on an environment that the electricity is cut unexpectedly (it is far complicated to place PSU, etc.) and it would happen every day couple times. I wonder if the unexpected power cuts would cause crash/problem on the Linux Operation System? If it is something that I should worry, what would you suggest to prevent the damages on OS against the unexpected power cuts? PS. The application needs to writes some data to the storage medium (SD card), I think it would not be suitable to mount it as read-only.

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  • APC switched rack PDU: Startup outlet state

    - by Ian Gregory
    I have an APC Switched Rack PDU powering a number of servers in a remote datacentre. After a recent power outage, I noticed that the outlets did not automatically default to the On status once power was restored. Having reviewed the Web UI, I cannot find this option. I'm not certain of the model number (it doesn't appear to be visible in the Web UI), but I think it's this one. Is it possible to configure these PDU units to automatically power outlets after a cold start?

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  • Add power over Ethernet without new switches?

    - by dannymcc
    I need to power 16 IP phones over their Ethernet connections. I am in the process of changing our switches and only the phones need PoE, everything else is powered by mains cables. I have contacted the supplier of the phones and for 16 mains leads it will be close to £300. I know it's possible to get a PoE injector that goes between the mains and the phone but I would like to do this as tidily as possible and ideally in bulk. I imagine something that looks like a switch but doesn't actually 'switch' if that makes sense. Basically I want to inject power to 16 devices at once.

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  • Computer wont POST after power outage

    - by aaron
    I had just turned my computer on and windows was loading when the power in my neighborhood went out. Normally, when I turn my computer on, the video card fan spins up, then slows down, POST and windows boots. Now, after the blackout, the video card fan spins fast and wont stop. Nothing is displayed on the monitor. The monitor does not detect that the video card is sending it signals, it just stays on standby. No POST or beep codes. This is what I have tried so far: My motherboard has 2 PCI express slots and I tried plugging the video card into both of them but that didn't fix anything. I have replaced the power supply, that didn't fix anything. I cleared the CMOS, that didn't fix anything. Does anyone have any idea of what could be wrong? Thanks!

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  • Display won't come back from power saver mode

    - by tynor
    I wan't sure where exactly to post this question, but this one seemed the most relevant. I have a Dell LCD monitor running off a Dell Inspiron 531 tower with an Nvidia GeForce 8600 GT video card. Just recently, when I turn my computer on, the display immediately enters its "Power Saver" mode, and never wakes up. This problem doesn't occur with other computers, or even with this same computer when I use the integrated graphics. I have no other displays to test the card on. I have also tried replacing the power supply (my original one, which ran that video card for 4 years, was 300w, and I replaced it with 500w). Is there anything else I can try to troubleshoot this issue?

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  • Compaq Presario CQ40 unexpected turn off

    - by CRoshanLG
    My Compaq Presario CQ40 (yeah, its pretty old) suddenly turns off after about 1/2 - 1 hour usage without any notice or warning. The power cable and adapter works fine (indicator bulbs show that power is given to the laptop), but it seems like machine suddenly plugged off from the power source. And when I try to switch it on, after the sudden turn off it simply won't turn on. I can only turn it on after letting it to rest for at least couple of hours! ** The battery has been dead for some time now, but it has been working fine on direct power supply until recently. Has anyone encountered this? and hopefully knows any cure?

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  • Wireless printer going offline upon entering power save mode

    - by Regmi
    I recently bought a printer, Samsung ML1865W, a wireless laser printer. It works very well, wirelessly until after a while, it goes to power save mode when the printer goes offline. I then cannot connect to the printer (pinging the ip and various ports associated with it do not give any response) until I power cycle the printer. I have checked my wireless settings and my router, I have installed the printer software in WinXP, Win2000 and in Mac and the printer behaves just the same. Any ideas if the printer hardware itself is broken or that its something on my network/application side that's the culprit. If you own the printer, have you had any trouble like that at any time?

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  • How to stop blanking screen although I am active on Ubuntu Karmic on old IBM Laptop

    - by Glen S. Dalton
    How to stop blanking screen although I am active on Ubuntu Karmic on old IBM Laptop 600E? After some time of working on the machine the screen goes blank. When I hit ESC on the built-in keyboard (not on the attached USB keyboard where I work) it comes back and everything works fine until the next screen-blanking. I suspect it is some power management issue. When I use an old keyboard that has a ps2 connector it does not happen. So my guess is that the usb keyboard does not update the power management timer that detects when the session was last used? I am using fluxbox window manager. I do not want to disable power management because it is nice that the fan only works at the necessary speed (the fan spped is regulated which I can hear) But I could disable power management for testing purposes.

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  • Computer makes hissing noise, turns off after few seconds

    - by Kaustubh P
    I have a problem similar to the questions posted here and here. This is my config: Asus M3N78-EM, with AMD Phenom X3 720 2800 Black Edition, 4GB Transcend DDR2 RAM, Nvidia 9400GT. HD is a 160 GB IDE, and a LG IDE DVD-ROM. The power button is a bit off, I have removed the cover of the switch, and the only way it turns on is just giving the "stick" under the cover a gentle press. It turns on sometimes, and at other times, I have to cut-off the power from the PSU, and try again. I will describe my problem in as detail as possible, please bear with me: The problem has started in the last week, a few months after I changed the to the powerswitch arrangement as described above. The PC makes a hissing noise, and I wasn't able to pin-point the noise source, because of the various other fans. At first, removing the HD, rebooting w/o the HD, turning it off, reconnecting and booting made the problem go away. But of late, it doesn't happen. As suggested in the other questions, I tried reducing the load by disconnecting both the IDE drives, and the problem (noise + turn-off) still occurs. I also connected another 80G IDE HD,today morning, adn it still made that noise, and turned off. I also opened up the PSU, but I couldn't see any fault in that, I tried rotating the fan by blowing into the blades, and with my fingers, but the hissing noise didn't come from there. Or maybe the speed wasn't enough to evoke that noise. A few weeks ago: I had cleaned the Cabinet and had repasted the processor and its fan using some thermal paste. Could that be at fault? I also used a vacuum to blow the dust out of the PSU, could the power have been too much, to maybe offset the fan or something? A label on the PSU says it uses a ball-bearing fan. That only leaves me with the Processor fan and the processor itself. I didn't try removing the processor fan and processor from the motherboard, and then turning the PC on, fearing damage. Will doing so cause any damage? What can I do to localize and pin-point the problem? Also, after a few tries, the Computer starts up. Sometimes it turns of within 2 seconds, sometimes after the POST. Once it turned off at the grub. Another time it booted completely and then turned off. The only way to ensure that the PC wont turn off, is if the hissing noise stops. EDIT: I suspect it to be the Processor/Processor fan, owing to the source of noise. All the config, except for the Cabinet, is just over a year old. EDIT2: I also just remembered, that I had set the "On-power resume" to turn on, i.e. If I supply he PC with power, it will turn itself on, w/o me needing to press the switch. I had done that to workaround the faulty power-switch, as noted above. EDIT3: I calculated the power my system needs, from the antec site, and I just arrived at 292W

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  • External USB HD with -optional- mains?

    - by Stephen
    Hi, I'm Christmas-present-buying, and I'd appreciate recommendations for a USB HD with an optional mains power input. I've hunted, but can't find all the information I want (partially due to sketchy product specifications). Background: This is for a digital TV which I do not own, and so I'd like to get it correct first time. The TV has a USB port to allow recording straight to disk, but the manuals don't say how much power can be drawn through the USB port. The manual's instructions state, possibly generically, to plug the drive in before connecting to the TV. Ideally I'd like a small (2.5"?) drive which can draw power over USB, with an mains power input if it turns out the USB port on the TV doesn't offer enough juice. The ideal is to use one cable, two max. A powered USB hub would introduce too much clutter. I've spotted that the LaCie Petit drives have what appears to be an additional power input, but I'm not even sure from the specs what that is. And the device doesn't ship with a mains adapter. Suggestions?

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  • Best way to execute a command after Linux system halt

    - by Lukas Loesche
    Problem: The SSDs in our servers require a power cycle (i.e. off/on, not reset/warm reboot) after a firmware update. Thoughts: Using 'ipmitool chassis power cycle' I can cycle the server's power. However this would cut the power while the system is still running, filesystems are mounted, etc. What I basically want is a delayed power cycle so the system has a change to halt. But I guess that would have to be implemented on the server's IPMI board, so it's not really an option. My initial idea was to dynamically create a ramdisk containing the tool and libs and somehow integrate that into the halt process. I saw there's a /etc/init.d/halt, so that would be my starting point. Although I believe the kernel at some point in the shutdown process starts to kill off remaining processes. So I'm not even sure if that's a viable way. Question: What would be the best way to execute ipmitool (or any other command), after the system has halted and all regular filesystems are unmounted?

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  • APC ups es 700 randomly overload

    - by Matteo Mosca
    First of all, I live in Italy, Europe, so keep this in mind for Volt/Watt considerations. Standard voltage in Italian apartments is 220V. In my living room I have 2 APC ups, one being an ES-550 and the other an ES-700 They each have 4 slots for surge protection only, and 4 slots for surge protection + battery backup. Just to give all the information, they both got their battery replaced less than one month ago. The ES-550 works fine, without any problem. On the battery I have connected: Pc Monitor Sony Bravia 46'' 4th slot is empty The ES-700 has the following on battery: Xbox 360 Ps3 (standby when not used) Wii (standby when not used) Netgear 8 port switch (always on) Here's what happens: the ES-700, randomly, but mostly at night when I'm sleeping, goes like "overload", with the constant beep. If I try to shut it off keeping the power button pressed, nothing happens. The only thing that works is unplugging random stuff (sometimes unplugging 1 console works, other times I have to unplug all 4 devices). Every time this happens the problem is "real", meaning the 4 devices become unpowered, so it's not just an "alarm no working properly" problem. While I'm sleeping, of course, the power usage is what described on the list, 2 devices on standy, 1 off and 1 on. Today it happened again while I was playing with my Ps3. I unplugged it, problem went away. I plugged it again, and it kept working fine. I just can't figure out what's the problem. The only additional info I can provide is that this behaviour started after a big power outage last december 26 (a blackout that lasted almost all day) but the "surge protection" part of those UPS should be there for those problems, to leverage peaks when power goes away or gets restored. Another funny thing is, althought it might not be related, for a couple of days after that event the Wii was unable to power on, I thought its power transformer was broken, but then it suddenly started working again. I can be sure it's not the Wii overloading the UPS because the overload happens even if I leave the Wii unplugged. Any suggestion is really appreciated, and I can provide any additional info, if needed, that didn't come to mind right now. Thanks.

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