An IT infrastructure perspective on optimizing business applications
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…
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…
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…
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…
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…