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Scott Drummonds on Virtualization

Disaster Recovery, Downtime Avoidance, and High Availability

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Map of Asia Pacific and JapanLast week in Asia Pacific and Japan we completed our annual presales conference roadshow (PSCR). At this PSCR I delivered a talk to the presales community on the intersection of three great solutions: disaster recovery (DR), downtime avoidance (DA), and high availability (HA). Each of these is easily understood by its own. But their combinations can introduce mind-bending complexity. I used my presentation to untangle some mental knots.

I believe that mixed DR/DA/HA environments are so complex that very few people in the world fully understand their complexities. Scott Lowe might be the only person I have worked with that appears to have a complete grasp of the situation. I know I do not. So, you might find it strange that I was called upon to lead this talk.

Well, I learned a lot in the talk.  Both from the research prior to its first delivery and from the hallway conversations that followed my sessions.  I documented, learned and created a few key concepts for this talk. Here they are.

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vShield Clarification

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A couple of weeks ago I wrote on vShield. As I said then, the Asia Pacific and Japan vSpecialists have spent a lot of time on this wonderful product. We love it. The purpose of my blog entry was to highlight a best practice that would avoid an annoying issue. That issue is that vShield App installation on ESX hosts running a vCenter virtual machine can disconnect vCenter from the network. The workaround–documented in the vShield Administration Guide–is to run vCenter and vShield manager on a management cluster. Case closed. Well, not yet.

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Maximum Hosts Per Cluster

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I just returned from a one week vacation to a warm sunny beach on a small island not too far from Singapore.  Even on my vacations my conversations often migrate to technology and my travel mate is an old friend and current employee at VMware, Dave Korsunsky.  Sitting by a pool with a cocktail in hand at a fantastic hotel I asked my friend, “what is the right number of hosts per DRS/HA cluster?”  Great conversation for a vacation, right?

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