Controller failures can impact performance.
The controller is designed to minimize performance impacts when running in an HA configuration. When using RAID 5, 6, and 10, parity footprints are mirrored between the controller's nonvolatile memory, which causes only a slight impact to performance. For controllers with write cache, all cache data is mirrored between the controller's nonvolatile memories, which also causes only a slight impact to performance.
If one controller fails in an HA configuration, the remaining controller will disable write caching and begin to keep an additional copy of parity footprints on disk. This can significantly impact performance, particularly when using RAID 5 and RAID 6.
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