Cache watermarks in Huawei flash storage systems manage dirty data flushing. The *HCIP-Storage V5.5 Training Material (Module 5: Storage System Maintenance and Troubleshooting)* explains:
- Option A: True. “The low watermark for dirty data should be around 20% to ensure sufficient buffer space.”
- Option B: True. “The high watermark should not be too high, and the gap between high and low watermarks should be sufficient to avoid frequent flushing.”
- Option C: True. “A high watermark that is too high causes I/O fluctuations and increased latency during traffic bursts.”
- Option D: False. “High watermarks affect write performance by delaying flushes, but low watermarks do not directly impact read performance, which depends on prefetch and cache hit ratios.”
Thus, option D is false.
[Reference: , HCIP-Storage V5.5 Training Material, Module 5: Storage System Maintenance and Troubleshooting, Section 5.15: Cache Management and Optimization*, Huawei Technologies Co., Ltd., , ---, ]
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