High Availability: A Contrarian View Tech Ed North America 2010 12/3/2018 5:04 PM Required Slide SESSION CODE: ARC308 High Availability: A Contrarian View Udi Dahan – The Software Simplist Enterprise Development Expert & SOA Specialist © 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

High Availability – The Common View

Watching Out For Single-Points-Of-Failure

Disaster Recovery Planning – The Wrong Way

Agenda Today Problems Solutions

Today: Current Solutions

Disaster Recovery Planning

Common Solutions and Technologies Single Site Multi Site Failover Data Loss Cost DB Clustering Yes No Automatic None High Disk Mirroring Mid SAN Snapshots Manual Some Log Shipping Low Replication Minimal * * No TX consistency

Software developers largely not involved

Except in deciding what to show the user…

Problems: What’s Missing?

Critical Windows Patch Reliability [HTTP] $$ Order DB App Tx Call 1 of 3 Call 2 of 3 Critical Windows Patch Rollback Where’s the order!?

When Deadlocks Happen Where’s the order!? DB App Tx [HTTP] $$ Order Call 1 of 3 Call 2 of 3 Exception A B Write to log Where’s the order!? Deadlock

Stop The World Upgrades

Solutions: Always-On Systems

Reliability … but what should we do if deserialization fails? Tx Q App Rollback Tx $$ Order Q Receive Rollback App DB Call 1 of 3 Call 2 of 3 The order is back in the queue

Reasons Why Deserialization Fails - Upgrades V1 Message V1 Client V2 Server There is valuable data in that message!

Error Queues & Poison Messages Admin reverts to previous version manually returns msg Tx $$ Order Q Receive App Deserialization exception V N-1 Move to error queue

Upgrading Servers V1 V2 DB V1 V1 V2 Q V2 V1 V2 V1 V2

Backwards Compatibility – The Crux Of It All

In Closing

What about the cloud?

High Availability Leads To High Agility

Thank you Udi Dahan – The Software Simplist Tech Ed North America 2010 12/3/2018 5:04 PM Required Slide SESSION CODE: ARC308 Thank you Udi Dahan – The Software Simplist Enterprise Development Expert & SOA Specialist email@UdiDahan.com www.UdiDahan.com © 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

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Tech Ed North America 2010 12/3/2018 5:04 PM © 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION. © 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.

Required Slide Tech Ed North America 2010 12/3/2018 5:04 PM © 2010 Microsoft Corporation. All rights reserved. Microsoft, Windows, Windows Vista and other product names are or may be registered trademarks and/or trademarks in the U.S. and/or other countries. The information herein is for informational purposes only and represents the current view of Microsoft Corporation as of the date of this presentation. Because Microsoft must respond to changing market conditions, it should not be interpreted to be a commitment on the part of Microsoft, and Microsoft cannot guarantee the accuracy of any information provided after the date of this presentation. MICROSOFT MAKES NO WARRANTIES, EXPRESS, IMPLIED OR STATUTORY, AS TO THE INFORMATION IN THIS PRESENTATION.