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Forum: Passengers & SLF (Self Loading Freight)

2nd Jun 2017, 14:23

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

The poster mentioned: As far as I am...

The poster mentioned:

As far as I am concerned (and I maintain very huge mission critical systems), I'd treat your average small system for a tiny company in the same way. You have a small...

Forum: Passengers & SLF (Self Loading Freight)

2nd Jun 2017, 10:36

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

You know those films where it takes forever to...

You know those films where it takes forever to kill the baddie? Those films where he (or she) keeps coming back despite apparently having been killed? That's what a GDSP (geographically dispersed...

Forum: Passengers & SLF (Self Loading Freight)

2nd Jun 2017, 10:21

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

This is far far worse than human error regarding...

This is far far worse than human error regarding a single event. It's not just one contractor. I hate to repeat that I have decades of experience in this form of computing. If I operated at my...

Forum: Passengers & SLF (Self Loading Freight)

2nd Jun 2017, 10:16

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

To be honest, you failed in your remit. ...

To be honest, you failed in your remit.

I've designed several datacenters. You simply make it impossible for such unplugging. I'd have been horrified if you made this suggestion to me.

Forum: Passengers & SLF (Self Loading Freight)

29th May 2017, 16:08

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

Exactly. They're not just there for hard outages....

Exactly. They're not just there for hard outages. In the past, with older mainframes, I have wanted to limit the Ups to twenty minutes. If air-handling is gone too a system will cook itself.

Forum: Passengers & SLF (Self Loading Freight)

29th May 2017, 16:01

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

I've seen the complete history which led to the...

I've seen the complete history which led to the problem. The problem was most certainly not one caused by outsourcing. The ad referenced in the article is for an experienced admin. That is way below...

Forum: Passengers & SLF (Self Loading Freight)

29th May 2017, 15:23

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

No. The UPS is more than a bank of batteries....

No. The UPS is more than a bank of batteries. It's an expensive piece of kit which smooths the supply during Brown outs, during spikes and during the absence of any power at all. The electrical input...

Forum: Passengers & SLF (Self Loading Freight)

29th May 2017, 15:17

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

My experience based on decades as a consultant...

My experience based on decades as a consultant operating directly in the fields of resilience, availability, disaster recovery and business continuity planning is that the legacy systems are always...

Forum: Passengers & SLF (Self Loading Freight)

29th May 2017, 15:06

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

I've refused contracts where one particular...

I've refused contracts where one particular outsourcer was involved. No names, obviously. The practice has been in the very large systems I've worked on to keep the crown jewels at home. Functions...

Forum: Passengers & SLF (Self Loading Freight)

29th May 2017, 13:52

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

Or "associates".

Or "associates".

Forum: Passengers & SLF (Self Loading Freight)

29th May 2017, 13:50

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

I would dispense what that rumour as the work of...

I would dispense what that rumour as the work of someone who has little clue about large scale high-availability IT (such skills not being a prerequisite for life). Systems are not patched/tested on...

Forum: Passengers & SLF (Self Loading Freight)

29th May 2017, 09:20

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

It should be that easy, but the intricacies are...

It should be that easy, but the intricacies are otherwise. Do you mirror or shadow? How often do you synch (remembering that the synch period involves all participating to hold their breath briefly...

Forum: Passengers & SLF (Self Loading Freight)

29th May 2017, 07:15

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

Asking staff to remain schtum in these events is...

Asking staff to remain schtum in these events is standard industry practice. It's generally done for legal reasons. If someone names a piece of kit as the culprit and the subsequent enquiry reveals,...

Forum: Passengers & SLF (Self Loading Freight)

29th May 2017, 05:43

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

They only way I can see it happening is as...

They only way I can see it happening is as follows :

You're running x number of data centers each geographically remote of each and each mirroring the active Datacenter and each designed to...

Forum: Passengers & SLF (Self Loading Freight)

28th May 2017, 06:33

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

You misunderstood me. My entire career has been...

You misunderstood me. My entire career has been working on mainframes. The type of fail over capabilities you describe are not quite thirty years old, but you are correct that not simply sysplex, but...

Forum: Passengers & SLF (Self Loading Freight)

28th May 2017, 05:43

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

For something such as a a database subsystem and...

For something such as a a database subsystem and its the associated application layer there will be many hundreds and potentially thousands of coders involved.

Forum: Passengers & SLF (Self Loading Freight)

27th May 2017, 22:35

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

To IPL a mainframe shouldn't take more than five...

To IPL a mainframe shouldn't take more than five to ten minutes. If you want to cold start all systems and subsystems maybe a bit longer, but I'd expect to IPL my mainframe quicker than my smartphone.

Forum: Passengers & SLF (Self Loading Freight)

27th May 2017, 21:44

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

Nobody calls a disaster situation. They're afraid...

Nobody calls a disaster situation. They're afraid to. Twenty years in the business thought me that. When I moved into disaster recovery it was my first lesson.

Forum: Passengers & SLF (Self Loading Freight)

27th May 2017, 21:39

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

Err, no. If your climate management has also...

Err, no. If your climate management has also failed you *want* your system to go down before it cooks itself and turns its drives into pizza.

All of clients have geographically dispersed sys s....

Forum: Passengers & SLF (Self Loading Freight)

27th May 2017, 17:03

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

There are dinosaurs such as I am who still...

There are dinosaurs such as I am who still operate in that environment you describe. I remember the Gulliver system, where unknown to those operating it, they were issuing native IMS commands without...

Forum: Passengers & SLF (Self Loading Freight)

27th May 2017, 16:43

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

This is classic stuff. The public demands ever...

This is classic stuff. The public demands ever increasing functionality which ends up as bolt-ons to legacy systems. The multiple layers between the core system and the application and presentation...

Forum: Passengers & SLF (Self Loading Freight)

27th May 2017, 15:51

Replies: 634

BA delays at LHR - Computer issue

Views: 303,334

Posted By Nialler

It failures

A word of caution:I wouldn't automatically hit the "outsourcing" button here. Lots of core systems remain domestically controlled. RBS was a classic example of this. As with any aviation incident I'd...

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