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UNIX for Advanced & Expert Users
Delete first 100 lines from a BIG File
Post 302657453 by Scrutinizer on Sunday 17th of June 2012 06:52:08 PM
06-17-2012
Moderator
Well that is probably because nobody does it that way 
Backed up with a UPS hey? I have seen systems go down or heard of systems going down because...Indirectly, most of this is human error of course, for example because manuals or procedures were ignored, but the reality is... that that is reality, since most teams do not consist entirely of the cream of the crop and Murphy is having a ball in data centers.. 
Backed up with a UPS hey? I have seen systems go down or heard of systems going down because...
- Two power chords of two were plugged into the same phase of the ups...
- Two power chords of three were plugged into the same phase of the ups and when that group failed the remaining power supply could not handle it
- The second power supply had been broken and so was the monitoring system, so when the other one failed..
- Someone took out both power chords.
- Someone knocked out both power chords
- Hard disks failed and not all logical volumes were mirrored
- Controllers failed and the other channel was on the same controller
- Memory died..
- A power failure during maintenance of the UPS
- The UPS ran out and the diesel generator ran out of diesel
- The UPS ran out and the power relay that was supposed to switch the generator on did not function because the battery of the tiny UPS that served only that relay was way overdue and had gone dead..
- Un uneven current draw on one phase and down went the UPS and it took everything with it..
- A high availabiliy cluster failover for whatever reason..
- Systems with officially no SPOFs had SPOFs
- etcetera
- and so forth
Last edited by Scrutinizer; 06-17-2012 at 08:01 PM..
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