SAN Volume Controller: Best Practices and Performance Guidelines

Chapter 2.3.1. Cache destage operations

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Chapter 2. SAN Volume Controller cluster 29 Figure 2- 5 Native MBps compared to SVC- attached storage For both parameters, I/ Ops in Figure 2- 4 on page 28 and MBps in Figure 2- 5, we saw a large performance improvement by using the SVC. 2.3.1 Cache destage operations This section discusses cache operations. SVC internal cache handling The SVC cache is provided to improve performance of read and write commands by holding some read or write data in SVC memory. Because the nodes in an I/ O Group have physically separate memories, the cache component must keep the caches on both nodes consistent. The caches will be consistent in that a read to either node will return the last data written through either ...