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Hitachi Vantara Knowledge

Storage quotas

Both tenants and namespaces have hard and soft storage quotas:

  • hard quota

    An absolute number of bytes. For a tenant, it is the total amount of storage available to that tenant for allocation to its namespaces. For a namespace, it is the total amount of space available for storing objects in that namespace, including object data, metadata (except ACLs), and the redundant data required to satisfy the namespace DPL.

    NoteHCP checks the amount of data stored in a namespace against the namespace hard quota hourly. If large amounts of data are added rapidly to a namespace, the namespace can store substantially more data than its hard quota allows.

    Each namespace managed by a tenant can exceed its hard quota in this way. As a result, the total amount of storage used by all the tenant's namespaces can exceed the hard quota for the tenant.

  • soft quota

    The percentage point at which HCP notifies the tenant that allocated storage space is being used up. For a tenant, the soft quota measures the space used in all the namespaces the tenant owns relative to the hard quota for that tenant. For a namespace, the soft quota measures the space used in just that namespace relative to the hard quota for that namespace.

The storage quotas for a tenant are set when the tenant is created. HCP system-level administrators can change these quotas at any time. However, the hard quota for a tenant cannot be set lower than the amount of space the tenant has currently allocated to its namespaces.

The storage quotas for a namespace are set when the namespace is created. You can change these quotas at any time. However, the hard quota for a namespace cannot be set lower than the amount of space currently used in the namespace. And, the total of the hard quotas for all the namespaces owned by a tenant cannot exceed the hard quota for that tenant.

 

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