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Hitachi Vantara Knowledge

Data protection level

Each namespace has a data protection level (DPL) that specifies how many copies of each object HCP must maintain. HCP stores each copy of an object in a different location. All but one of these copies can become unavailable (for example, due to a hardware outage) without affecting access to the object.

The DPL for a namespace can be one (if allowed by the HCP system configuration), two, three, four, or dynamic. The highest allowed DPL is also determined by the HCP system configuration.

When the DPL is set to dynamic, the namespace uses the current HCP system-level DPL setting. Typically, this is the optimal DPL for the system configuration. If the system-level DPL setting changes, HCP adjusts the number of copies of objects in the namespace to match the new setting.

The DPL affects the amount of storage used when data is added to the namespace. With a DPL of one, HCP stores only one copy of the object. With a DPL of two, HCP stores two copies, thereby using twice as much storage.

The DPL for a namespace is set when the namespace service plan is created. You can change this setting at any time.

 

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