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1>Cache high and low watermark indicates the maximum and minimum values of dirty data stored in the cache.
2> when the size of dirty data in the cache reaches the upper limit, the system synchronizes the dirty data from the cache to the hard disk at a high speed. When the size of dirty data stored in the cache is less than the maximum value and is greater than the minimum value, the system synchronizes the dirty data in the cache to the hard disk at a medium speed. When the capacity of dirty data stored in the cache is less than the minimum value, the system synchronizes dirty data to the hard disk at a low speed.
3> increase the low water level and decrease the high watermark.
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