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Questions tagged [ups]

uninterruptible power supply

An uninterruptible power supply, also uninterruptible power source, UPS or battery/flywheel backup, is an electrical apparatus that provides emergency power to a load when the input power source, typically mains power, fails. A UPS differs from an auxiliary or emergency power system or standby generator in that it will provide instantaneous or near-instantaneous protection from input power interruptions by means of one or more attached batteries and associated electronic circuitry for low power users, and or by means of diesel generators and flywheels for high power users. The on-battery runtime of most uninterruptible power sources is relatively short—5–15 minutes being typical for smaller units—but sufficient to allow time to bring an auxiliary power source on line, or to properly shut down the protected equipment.

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Source: wikipedia

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FTP: How to get rid of "WARNING! 1 bare linefeeds received in ASCII mode" message?

I wrote a little shell script (on CentOS) to download statistics from our APC UPS device. It works great, but everyday cron sends an email with this message: WARNING! 1 bare linefeeds received in ASCII mode File may not have transferred…
cider
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Is there a solution against short power outages except UPS?

I encounter very short power outages quite often. Typically they last for just couple of seconds - perhaps the power grid maintenance staff just flips the switch to "Off" and then immediately to "On". However this is enough for all kinds of IT…
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UPS power requirements for server

Greetings! So, I just placed an order for a new server. The company recommended that I get a 3000W UPS. (!) As best as I could I calculated the following wattage consumption based on benchmarked data or datasheets provided by the manufacturers of…
captainentropy
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Server power supply failures?

I have 6 servers both with 2 power supplies attached to an UPS. I want to add 4 more servers but the UPS is full and due to budget restriction I couldn't buy a new one for months. The 6 + 4 new servers are running essential services (high uptime…
Kami
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Calculate UPS Power

Does anyone know how to calculate UPS Power assuming I have server with 650 of watt.
Funky81
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Redundant Power Supplies and UPS (Dell Servers)

I have a number of Dell 2950 servers with two power supplies. In normal usage how are the PSU's utilised? Do they both draw '50%', only switching to 100% if one of them dies? Does one supply provide most of the power whilst the second is more or…
Marko Carter
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How to perform a APC 9617 Reset?

I've locked myself out of an APC 9617 management card. Trying to figure out how to reset the password, or even the card to factory defaults. All the documentation I can find says to connect to the serial interface on the 9617 and initiate a reset…
bab
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APC Smart-UPS: remote power shutoff?

Given: A server room containing about two dozen rackmount servers and a PBX. About a dozen APC Smart-UPS 2200s providing power to this equipment. A fire suppression project requiring immediate shutoff of power to all servers in the event that the…
Skyhawk
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Is Tripp Lite a trusted brand for a UPS?

I am looking to buy a rack mounted UPS that can take in 208V power and serve up 120V power. A basic APC unit that can do this is $4k. I have found a Tripp Lite model that will work for $2.5k. Is the extra $1.5k for the APC just for the brand? Or…
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Do aging UPSes need to be replaced?

I've got a 2200VA UPS with AVR and power conditioning that's over 10 years old. Does a UPS lose its ability to protect equipment over time? I'm not asking about batteries, but the UPS hardware itself.
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ZFS - enable or disable disk cache?

I'm setting up ZFS (through FreeNAS) with RAIDZ1 on a server with 4 x WD Red SATA HDDs (connected through a PERC H330 in HBA mode). The server is hooked to a UPS. For ZFS and in this setup, does it make sense to enable HD cache of each disk, or is…
matthias_buehlmann
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How can I fix my UPS repeatedly disconnecting and reconnecting?

I'm running a nut server connected to a Tripp Lite SMART1500LCD by USB. The device is behaving unexpectedly and I can see these kernel messages: user@host:~ $ dmesg -T [Wed Dec 4 13:24:24 2019] usb 1-1.5: USB disconnect, device number 91 [Wed Dec …
Layne
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Cancel / block a task triggered with delay by windows "task scheduler"

This is related to a specific issue, but I think it is an "interesting" question for general use: In Windows (specifically 2k8 server, for me) you have a task that is triggered by an event (specifically, the UPS goes on battery because power failed)…
James Newton
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UPS for 30A service to server racks

Our server rack has two 208V 30A dedicated circuits running to it, each to a PDU mounted in the rack. Most of the equipment has redundant power supplies so one goes to each PDU. I'm not sure who had this installed but it seems like overkill for our…
Hank
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APC UPS replace battery light and apcupsd reporting "replace battery"

We have an APC Smart UPS 1500. The "Replace Battery" light is on, and apcupsd reports: Emergency! Batteries have failed on UPS xxxx. Change them NOW However, from this article,…
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