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high availability

Stretched Clusters – Alien storage

Bart Sjerps 2011-08-15 Oracle, VPLEX No Comments

In my previous posts I described how Oracle ASM can be used to build stretched clusters. I also pointed to some limitations of that scenario. But I am by far not the first one in doing so – and some…

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Stretched clustering basics

Bart Sjerps 2011-08-11 Oracle, VPLEX No Comments

Before showing my preferred solution for Oracle stretched high availability clusters, first some clustering basics. Active/passive versus Active/Active clusters Most clustering software is based on active/passive scenarios. You have a system (say, a database) that is running on a set…

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Limitations of host-based mirroring for stretched clusters

Bart Sjerps 2011-07-25 Oracle, VPLEX 4 Comments

For data mirroring, EMC SRDF is sometimes used in such a setup that both servers write to one location only (the “far” server writes across dark fibre links to the local storage). EMC has similar tools (Mirrorview, Recoverpoint, etc) for…

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Extreme availability with Oracle stretched clusters

Bart Sjerps 2011-07-22 Oracle, VPLEX No Comments

Some of my customers have been pushing for more availability in their Oracle database applications. They want to eliminate downtime completely even if they experience a site failure. Whether this is a real business requirement or a technology push, I’m…

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