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Forwarded message: Reply-To: <[log in to unmask]> From: "richard r. moore" <[log in to unmask]> To: (list suppressed) Subject: ACNS computer services shutdown Date: Wed, 1 Dec 2004 15:12:18 -0500 ACNS will be turning off power to the computer room in the computer center on 29 december. We expect that the power will be off for twelve hours starting at 0700 on wednesday, 29 december. This means that no servers in the computer room will be operating. Some services will still be available from alternative locations. We will be sending you more details later. The electrical power in the computer room was originally designed (over forty years ago) for mainframe computers running a combination of 400 hertz and 60 hertz power. As we added new mainframes, we added additional circuits. When we added servers to the complex, we added more circuits. As we add more servers and cluster computing systems to the computer room we have been finding it more difficult to supply power -- mostly because the power cables that were used 30 years ago are still in the conduits and these conduits have exceeded their capacity. Furthermore, the insulation on some of the power cables installed many years ago is starting to deteriorate. In order to clean things up, pull out unused cables, replace bad cables, update the power panels, etc. we have to turn off all electrical power to the computer room. We are determining what services can be supported over this long power outage; we will send you more information as we proceed.