Introduction to a watermark policy of OceanStor 9000

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OceanStor 9000 uses watermark policies to monitor the storage capacities in node pools. Based on the available capacities in node pools, OceanStor 9000 determines where to store new data.

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Introduction to a watermark of OceanStor 9000
A watermark indicates the percentage of used space to the total storage space in a node pool. There are high watermark and read-only watermark.

Introduction to the high watermark of OceanStor 9000 V100R001C01
In OceanStor 9000 V100R001C01, the default high watermark is that the used space occupies 85% of the total storage space of a node pool. When the used space of a node pool reaches the high watermark, the system reports a capacity insufficiency alarm, and refuses data to be written to the node pool. By default, the alarm clearance threshold is 5% lower than the high watermark. That is, when the percentage of used space is lower than 80%, the capacity insufficiency alarm is cleared. The alarm threshold and clearance threshold of the high watermark can be manually changed.

Introduction to the read-only watermark in OceanStor 9000 V100R001C01
In OceanStor 9000 V100R001C01, the default read-only watermark is that the used space occupies 90% of the total storage space of a node pool. When the used space of a node pool reaches the read-only watermark, the system reports a read-only alarm, and refuses data to be written to the node pool. By default, the read-only alarm clearance threshold is 5% lower than the read-only watermark. That is, when the percentage of used space is lower than 85%, the read-only alarm is cleared. The alarm threshold and clearance threshold of the read-only watermark can be manually changed.

Introduction to the high watermark of OceanStor 9000 V100R001C20 and V100R001C30
In OceanStor 9000 V100R001C20 and V100R001C30, the default high watermark is that the used space occupies 85% of the total storage space of a node pool. When the used space of a node pool reaches the high watermark, the system reports a capacity insufficiency alarm, but still allows data to be written to the node pool. By default, the alarm clearance threshold is 5% lower than the high watermark. That is, when the percentage of used space is lower than 80%, the capacity insufficiency alarm is cleared. The alarm threshold and clearance threshold of the high watermark can be manually changed.

Introduction to the read-only watermark of OceanStor 9000 V100R001C20 and V100R001C30
In OceanStor 9000 V100R001C20 and V100R001C30, the default read-only watermark is that the used space occupies 90% of the total storage space of a node pool. When the used capacity of a node pool reaches the read-only watermark, the system reports a read-only alarm, and refuses data to be written to the node pool. By default, the read-only alarm clearance threshold is 5% lower than the read-only watermark. That is, when the percentage of used space is lower than 85%, the read-only alarm is cleared and data can be written to the node pool. The alarm threshold and clearance threshold of the read-only watermark can be manually changed.

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