On the naming of machines
The other thing we had to do the other day was name the new server we were bringing up, which is often harder thanit looks.
Good names machine are important because they let you tell thingsapart. This means that good names have to be different from eachother, so you can avoid fun games like 'was it ws3-05 or ws5-03 thathad the problem?'
People usually resort to generic names like 'ws5-03' for two reasons:they
Try things out with new machines
I just gave someone at work this advice today, so I might as wellrepeat it here. We were bringing up a new machine, a nice dualprocessor server with a hardware RAID-1, and I suggested to him thatbefore he even thought about putting it into production he take theopportunity to yank one of the drives and see what happened.
There are occasions where you would do this to a machine inproduction, but not very many. New hardware (or idle hardware) isabout your only chance
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我 最喜歡的是「自
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Really understanding availability numbers
People like to talk about reliability and availability, and throwaround terms like '5-nines availability' and so on. You may have heardthis from server salescritters (alongside their attempts to sell you redundant power supplies ).
At the same time, what the terms really imply is not intuitive andis often surprising, especially at the high end.
The following chart comes from my co-worker John Calvin:
| Jargon | Rating | Down Time |
| "6-Nines" | 99.9999% | ~30 |
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