We have a rack in a data center and we became suspicious of running out of power. But our power bar says 2 amps! It has a live indicator, so it's not just one reading. Do you think there's something wrong with the powerbar?
Worth mentioning: Until now we never checked the power bar to verify the numbers it said made sense.
Our equipment (approximately): Six 1U servers with 2 disks each. One 2U Dual Core with 6 drives One 2U Dual-Quad Core One MD1000 loaded with 15 drives Two other drive enclosures with 16 drives total.
We have many users and there's always activity, and if not, we're backing up. It's remotely possible that there was small amounts of activity of maybe 5 mbits/s, but 2 amps? That seems strangely low, but I'm not an electrician.
Why We Think We're Running Out of Power - Using general calculations or the Dell Capacity Planner (http://www.dell.com/html/us/products/rack_advisor_new/) we are at about 17-21 amps, which is the limit of our circuit.
We put 2 disks into a drive enclosure and our (completely unconnected) server on the power outlet next to the enclosure rebooted! There's no iSCSI or cabling between the 2 systems. This happened twice when we added disks on 2 different days. The server that rebooted is rock-solid. I've never seen it ever reboot unless we did it ourselves.
I've had experience with power issues in the past (different system entirely) and the same stuff that happened then is happening now.. Once every day or two, a server goes mostly offline for 30 minutes (pings but nothing else)... Random equipment strangeness (in this case, a drive enclosure is running really slow (could be regular performance but under 10 MBytesPS? We needed to move customers since it couldn't even deal with FTP traffic)... Again, I'm very open to the fact that this is due to other things, but it looks familiar to me.