Had an older APC rackmount UPS die on me this weekend. First time I've seen a UPS fail like that in my 8 years of doing IT work.
The only items connected to this particular UPS are the Dell 3348 48 port 10/100 switches (we have 3, each with 2 gig links to the 5524 24 port gig switch).
The 2 gig links on each switch are trunked or teamed together.
Once the switches were turned back on, they had an older config running (guess I didn't copy running config to startup config when I set up the teams) so I had to do some reconfiguring and then made the mistake of turning off Spanning Tree Protocol on one of the 3348s (not a good idea when you have trunked ports) which of course hosed things until I rebooted the 5524 as well.
Not the way I had planned to spend my Sunday afternoon, but there it is.
Have a new TrippLite SmartPro 1500 2U rackmount UPS coming in from Dell. I've been using TrippLite's products more and more lately. They make good, reliable stuff that is relatively inexpensive when compared to other vendors. I have had problems with their version 12.x UPS monitoring software and the SmartPro 550 USB UPSes that we purchased for every desktop here, but that's a matter for another post.
Anyhow, from what I can tell, the initial UPS failure that spawned all of this was caused by a short from a failing battery pack. As far as I can tell it was recently installed as a replacement for the original packs, but I can't tell if the battery pack was from APC or someone else. Can't even get the packs out of the unit as the top of one of them is deformed from overheating.