We have a "static switch" in our datacenter that does what you are talking about. We plug single corded devices into it and the static switch connects to 2 different UPSs so the single cord devices don't lose power. We had what Liebert is calling an "impossible reality" here over the weekend: one of our UPSs lost 6 batteries - one in each bank - and went down hard. It took too long to fail over to utility power and we had a whole bunch of servers go down hard. Since then we have been running on generator power in parallel with commercial power so we still have our full redundancy. They say we are burning $7000 worth of diesel a day... We are scheduled to switch back over to UPS power tonight. Boy am I glad it wasn't my turn to be on call. -Brian
________________________________ From: [email protected] [mailto:[email protected]] Sent: Tuesday, June 16, 2009 12:05 PM To: NT System Admin Issues Subject: OT: Tripp-Lite PDUs Greetings! I have a power supply situation that has me rather frightened... All our data and VoIP go through a single, non-redundant stack of Cisco Catalyst 3750 network switches (which also supply power to the phones via POE). These switches have only a single power supply. They are all plugged into a single UPS. Consequently, we have so many points of failure I'm afraid to count them! Apparently Tripp-Lite has some PDUs (Power Distribution Units) that feature "dual-input" with "Auto Transfer Switching" ("ATS"). They're not cheap, but it _appears_ that ATS will allow one to plug the PDU into two separate UPS units. This way, if a UPS crapped-out royally and would not allow even available line current to pass (we've had this happen on some old UPS units), the company does not instantly blink out of existance. Is this in fact what "ATS" with dual-input does? Any experience, etc as to how well these things work? Thanks! (Oh yeah, any other positive suggestions for dealing with this situation? I checked, and our particular Cisco switches do NOT allow a second power supply to be added. Top level stuff, huh?) -- Richard D. McClary Systems Administrator, Information Technology Group ASPCA(r) 1717 S. Philo Rd, Ste 36 Urbana, IL 61802 [email protected] P: 217-337-9761 C: 217-417-1182 F: 217-337-9761 www.aspca.org <http://www.aspca.org/> The information contained in this e-mail, and any attachments hereto, is from The American Society for the Prevention of Cruelty to Animals(r) (ASPCA(r)) and is intended only for use by the addressee(s) named herein and may contain legally privileged and/or confidential information. If you are not the intended recipient of this e-mail, you are hereby notified that any dissemination, distribution, copying or use of the contents of this e-mail, and any attachments hereto, is strictly prohibited. If you have received this e-mail in error, please immediately notify me by reply email and permanently delete the original and any copy of this e-mail and any printout thereof. ~ Finally, powerful endpoint security that ISN'T a resource hog! ~ ~ <http://www.sunbeltsoftware.com/Business/VIPRE-Enterprise/> ~
