The scaling iq test when dev and admin collide
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The Scaling IQ Test: When Dev and Admin Collide PowerPoint PPT Presentation


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The Scaling IQ Test: When Dev and Admin Collide. Richard Campbell Strangeloop Networks. Richard Campbell. Background After thirty years, done every job in the computer industry you’ve ever heard of Currently Co-Founder and Product Evangelist for Strangeloop Networks Co-Host of .NET Rocks!

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The Scaling IQ Test: When Dev and Admin Collide

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The Scaling IQ Test: When Dev and Admin Collide

Richard Campbell

Strangeloop Networks


Richard Campbell

  • Background

    • After thirty years, done every job in the computer industry you’ve ever heard of

  • Currently

    • Co-Founder and Product Evangelist for Strangeloop Networks

    • Co-Host of .NET Rocks!

    • Host of RunAs Radio


The IT/Dev Meeting

  • Every web application has this meeting eventually

  • Sooner is always better

  • The goal is to trade information

    • What IT needs to know about the app

    • What Dev needs to know about the operating environment


The IT/Dev Meeting

  • Who needs to be in the room?

    • The architect/senior dev

    • Seniors devs that know the features in detail

    • IT personnel that will operate the application

    • Senior personnel that know the entire network


The IT/Dev Meeting

  • When does the meeting need to happen?

    • When the application is being designed (collected as requirements)

    • While the application is being developed

    • After the application is deployed

    • After the application has crashed horribly

    • When the application is too slow


The IT/Dev Meeting

  • Starting the meeting

  • What are the priorities

    • Reliability

    • Performance

    • Scalability

    • Accuracy

  • Put them in order, every site has different priorities


The IT/Dev Meeting

  • What IT Needs to Know

    • What’s in the web.config file (a great starting point)

    • What load balancing strategies will work for the application

    • Any known performance bottlenecks


Web.Config

  • <authorization>

    • None (Anonymous)

    • Windows (Active Directory, Basic, etc)

    • Forms-Based


Web.Config

  • <appSettings>

    • Global connection strings, paths etc

    • Make sure they’re being used!

    • Remove dead strings

    • These can be critical in failover/disaster recovery scenarios


Web.Config

  • <customErrors>

    • Decide on how errors should be displayed to the customer (internal or external)

    • Defaults are really not enough

    • You can create separate pages for each error (handle 404 page not found differently from 500 internal server error)


Web.Config

  • <sessionState>

    • In-process vs. out-of-process

    • More dependencies

    • Affects options around load balancing


Load Balancing

  • Find out what load balancing will work with the application

  • In-process session requires “sticky” load balancing

    • You only get to load balance the first request

  • Talk through server failure effects


Performance Bottlenecks

  • Discuss known performance issues

    • Night time processing that conflicts with existing work

    • Administrators work that significant impacts performance of regular users

  • What parts of the application are more scalable than others?


Things Dev Need to Know

The Network Diagram (in detail!)

How to get at production log data

What redundacy/failover/disaster recovery options there are


The Network Diagram

How developers see it


The Network Diagram

Closer to reality


Production Logs

  • Production logs are the truth of what happened with the application

  • Providing developers with production logs gives them a chance to help out

    • Provide access to the backups of the logs

    • Saying “I’ll give them to you when you ask” is not enough

    • You’re looking for proactive analysis


Disaster Recovery

  • All DR strategies require at least some coding support

    • SQL Server failover still needs to have queries retried to be seamless

    • What happens between the time a server fails and the load balancing strategy detects it?

    • Is losing request acceptable in your scenario?


Disaster Recovery

  • Switching to a backup site

    • Are DNS changes needed?

    • What references within the application need to be changed?

    • What does a switch-back look like?

  • Practice practice practice!

    • Don’t let your first failover test with an application be a real failure!


After the Meeting

  • What follow ups are there for management?

    • You’ve probably made some business-related decisions, make sure you have buy-in

  • When do we need to meet again?

    • Preferably before the next disaster


The Cooperative Firefight

  • IT is invariably on the front lines of an application failure

    • But when should development be brought in?

    • Post-mortem is often not enough


The Cooperative Firefight

  • Make a strategy to involve development during the firefight

    • They often have deep insight into how the application works and so can understand why it might fail

    • Just make sure they’re educated to not make the problem worse

    • This is NOT a time for fixing code


Summary

Have the meeting early

Repeat as necessary

Each group must learn from the other

Assist and seek assistance during a firefight


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