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- Newsgroups: comp.sys.sun.hardware
- Path: sparky!uunet!boulder!khonshu!ejh
- From: ejh@khonshu.colorado.edu (Edward J. Hartnett)
- Subject: Problems traveling with my Sun IPC
- Message-ID: <1992Jul30.182508.6793@colorado.edu>
- Summary: This is a summary of some problems I encountered while traveling
- Sender: news@colorado.edu (The Daily Planet)
- Nntp-Posting-Host: khonshu.colorado.edu
- Organization: Cooperative Institute for Research in the Environmental Sciences
- Date: Thu, 30 Jul 1992 18:25:08 GMT
- Lines: 74
-
- Recently I took a 5-week trip to the Portuguese island of Santa Maria,
- one of the Azores islands smack dab in the middle of the Atlantic. It
- was all part of a meteorological project called ASTEX. There were 50
- to 70 scientists on this island for the month of June, maybe more,
- with all kinds of equipment and computers, much of which was shipped
- in the charter flight we were on.
-
- We took our Sun IPC (without the monitor - I used a laptop on ttya as
- the console), including our exabyte 8200 drive, our Central Data SCSI
- terminal server, our 1.3Gbyte drive, and tons of cabels, etc.
- Everything but the drive we shipped in a special case we had
- purchased, which is specifically designed to shipping delicate
- equipment, and filled with foam pads that you can cut and layer such
- that you get an exact fit for your equipment. The disk drive (which
- was also our boot drive - no internal drive in this machine) I carried
- with me as carry-on luggage, in a heavily padded soft case.
-
- Unfortunately I dropped the drive at one point, about three feet (it
- fell of the baggage cart). When we got to Santa Maria I set it all up,
- but the drive had a number of problems. The point of posting this is
- to warn future travelers, and hopefully to get some understanding of
- exactly what happened to my machine. Here's a lit of the problems. Any
- thoughts would be appreciated. Please email, and after a while I'll
- post a summary.
-
- 1 - We repeatedly experienced a problem getting the disk to spin up.
- I had this problem here twice before I left my office. The problem was
- that the disk power would go on, but the disk wouldn't start spinning.
- (When it does start, it sounds like a miniature jet taking off - quite
- noticable). Most times (say 28 out of 30) it was no problem, it would
- take a little while, maybe 20 seconds, then spin up. But twice, after
- waiting a minute or two, I had to turned it off and try again. This
- was not a major annoyance. But, on Santa Maria, sometimes it took 50
- or 60 retries before it powered up again! We dreaded turing it off,
- but sometimes we absolutely had to, or the power would go off (we had
- a UPS but it wasn't always connected, because I suspected it was
- causing problems). All of this was on 220 volts, 50 Hz. (Both when it
- was plugged into the wall and into the UPS, which was made to put out
- European voltages. Towards the end of the project we had to move our
- computer setup, and I greatly feared we would never get that disk
- spinning again. But in the new location, there was an American voltage
- UPS, and it started up no problem. While connected to that power
- supply we powered off and back on three times, and each time it spun
- up immediately. Since we've gotten back it's also worked the first try
- every time. Any comments?
-
- 2 - When we arrived the boot sectors were somehow damaged or
- scrambled. It wouldn't boot. I had to take it to another machine,
- reformat the drive, and reinstall everything. This was a common
- problem that happened to at least two other Suns that were there. One
- more note, when I first formated the disk (in my office, before we
- left for Santa Maria), there were 0 defects in the defect list. But
- when I reformatted it, and it said it needed a defect list, I executed
- the "get the manufacturers defect list" and there were about 47
- defects listed. What could cuase this kind of problem?
-
- 3 - On several occasions I got an electrical shock from the SCSI
- connectors in the back. We probably had massive ground loops, could
- that explain it? Also I was plugging things in and out of the SCSI bus
- with the power still on. I know this is supposed to be a big no no,
- but has anyone ever experienced problems because of it? Why would it
- cause a problem anyway?
-
- 4 - For a while we were running our exabyte on 50Hz power (converted
- to 120V). Is this a problem for the motors inside? Another group
- brought a massive frequency shifter to get 60Hz power for their
- exabytes, so I eventually tapped into that. But I had already used the
- exabyte drive many times without any apparent prolems. Has anyone out
- there burned out an exabyte drive on 50Hz?
-
- That's it, I guess. I'm looking foreward to having some light shed on
- these mysterious problems.
-
- Ed Hartnett
-