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consistency

Through the wormhole with Stretched Clusters

Bart Sjerps 2011-08-17 Innovation, Oracle, VPLEX 5 Comments

Last year, EMC announced a new virtualization product called VPLEX. VPLEX allows logical storage volumes to be accessible from multiple locations. It boldly goes beyond existing storage virtualisation solutions (including those from EMC) in that it is not just a…

 1,681 total views

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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…

 918 total views

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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…

 1,487 total views

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How does Oracle keep data consistent on filesystems?

Bart Sjerps 2011-02-14 FAQ, Oracle No Comments

Sometimes there is questioning on how EMC can provide consistent snapshots on storage systems, given the fact that file systems like ext3, ufs and the like may keep write data in file system (server) cache.  662 total views

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