Read The Fine Manual at http://www.docs.hp.com/hpux/onlinedocs/1615/rp7400_customer/index.html under High Availability Requirements page 53 for a discussion complete with pictures for how to power your 240v PDU's across 3 branch circuits. Any one circuit can blow and the box keeps running. Paul Courry > I've had a similar question. The N-Class requires 2 power supplies to run. > If in your case PDU one goes out, your system dies. Should the N-Class be > set up on 3 separate PDU's? Each with their own UPS and power? > > David Knispel > [log in to unmask] > Phone: 513-248-5029 > Fax: 513-248-2672 > > > > -----Original Message----- > From: HP-3000 Systems Discussion [mailto:[log in to unmask]]On > Behalf Of John MacLerran > Sent: Thursday, September 19, 2002 5:05 PM > To: [log in to unmask] > Subject: [HP3000-L] N-Class Power Supply question > > > Dear HP3000-l > > We have an N-Class e-3000 (with 3 power supplies) configured as follows: > Power supply 1 & 3 are on one PDU that goes to a UPS, and > Power supply 2 is on the second PDU that goes to a second UPS. > > We also have an N-Class 9000 box configured similarly. The 9000 box > needs all 3 power supplies to boot, but if one of the power supplies > fails, the system can continue to run on the other two. > > Now for the question: Since both of the boxes in question are the same > hardware -- N-Class with 3 power supplies, do they both function the > same if one of the power supplies fails? If one of the power supplies in > the e-3000 fails, can it continue to run with the other two, or will it > crash? > > The reason I'm asking is that in October, we're scheduled to do a QA > test of some of our UPS's, and it could lead to a situation where the > e-3000 will lose power on one of the power supplies for a period of time > (20 minutes or so, while the UPS is rated), and we want to know if this > is going to present a problem to our 3000. > > Thanks! > ---------------------------------------------------------------------- > John MacLerran > IT Systems Analyst email: [log in to unmask] > Idaho State University V(208) 282-2954 > http://www.isu.edu/~macljohn F(208) 282-3673 > ---------------------------------------------------------------------- > > * To join/leave the list, search archives, change list settings, * > * etc., please visit http://raven.utc.edu/archives/hp3000-l.html * > > * To join/leave the list, search archives, change list settings, * > * etc., please visit http://raven.utc.edu/archives/hp3000-l.html * * To join/leave the list, search archives, change list settings, * * etc., please visit http://raven.utc.edu/archives/hp3000-l.html *