You are in uncharted territory. Literally. Typically reliability folks talk about the "bath tub curve" of failure rates: a high failure rate ("infant mortality), long low "stable failure rate", and an acceleration "wear-out" phase. I don't know anywhere where there is enough decent data to track long term reliability for N-Class populations at a statistical level with reasonable confidence bounds (even inside HP). I will say anecdotally the N-Class itself was not subject to any large quality issues that I can recall. That is, I have some recollection of issues both in K/T and following rx/rp ZX1&ZX2 systems but, while my attention may have wandered, things seem to have been pretty solid for N-Class. So all that to say I don't have any data to project when or if you'll see a rapid rise in parts replacement needs (the far side of reliability "bath tub curve"). Things that move, break. Remember "movement" includes thermal cycles through on/off or even temperature swings if you don't have well managed HVAC. Beyond Disk/Disc, Tape, Fans include power supplies. Like used cars you cannot know how 'hard' pre-owned parts have been used. YMMV. Caveat emptor. . .
Jim
-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On Behalf Of Mark Zender
Sent: Monday, July 27, 2015 11:36 AM
To: [log in to unmask]
Subject: Re: [HP3000-L] "N" Class Server Reliability
You should look at the "fuzzy buttons" on the CPU's. They do indeed wear out with age. If you replace your own CPU's you should put new buttons on first.
-----Original Message-----
From: HP-3000 Systems Discussion [mailto:[log in to unmask]] On Behalf Of krikor Gullekian
Sent: Monday, July 27, 2015 11:30 AM
To: [log in to unmask]
Subject: Re: [HP3000-L] "N" Class Server Reliability
We just got rid of our N class server after the migration. You could've bought it...
We had it since 2000... and the main problem we were having lately was with the tape drives, we had once a DTC or processor issue and after a cold start it went away.
Thanks,Krikor Gullekian
From: Steven Ruffolo <[log in to unmask]>
To: [log in to unmask]
Sent: Monday, July 27, 2015 1:14 PM
Subject: [HP3000-L] "N" Class Server Reliability
As everyone on this list I'm concerned about the reliability going forward of our "N" class servers. Are there any type of studies and metrics that could be used to determine how the failure rates of the parts on/in the "N" class will increase linear with the age of the equipment. I would imagine this would be true for any systems, but we have had an increase in processor failures over the last year. Is this coincidental or should we start trying to stock pile additional spares? Thanks.
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