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SAN Volume Controller: Best Practices and Performance Guidelines by

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Chapter 8.4.1. VDisk performance

Page 132

132 SAN Volume Controller: Best Practices and Performance Guidelines here, the SVC front- end cache mitigates the high latency at the back end, giving the user a good response time. Although there is no immediate issue with this VDisk, if the workload characteristics change and the VDisk becomes less cache friendly, you need to consider adding another MDisk to the MDG, making sure that it comes from another RAID array, and striping the VDisk across all three MDisks. Figure 8- 5 VDisk I/ O rate 8.4.1 VDisk performance It is vital that you constantly monitor systems when they are performing well so that you can establish baseline levels of good performance. Then, if performance as experienced by the user ...

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