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PowerScale OneFS 9.8.0.0 Web Administration Guide

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Quota types

OneFS uses the concept of quota types as the fundamental organizational unit of storage quotas. Storage quotas comprise a set of resources and an accounting of each resource type for that set. Storage quotas are also called storage domains.

Storage quotas creation requires three identifiers:

  • The directory to monitor
  • Whether snapshots are tracked against the quota limit
  • The quota type (directory, user, or group)
NOTE:Do not create quotas of any type on the OneFS root (/ifs). A root-level quota may significantly degrade performance.

You can choose a quota type from the following entities:

Directory
A specific directory and its subdirectories.
NOTE:You cannot choose a default directory quota type using the Web UI. You can only create a default directory quota using the CLI. However, you can manage default directory quotas using the UI (modify the quota settings, link, and unlink subdirectories). All immediate subdirectories in a default directory quota inherit the parent directory quota settings unless otherwise modified. Specific directory quotas that you configure take precedence over a default directory.
User
Either a specific user or default user (every user). Specific-user quotas that you configure take precedence over a default user quota.
Group

All members of a specific group or all members of a default group (every group). Any specific-group quotas that you configure take precedence over a default group quota. Associating a group quota with a default group quota creates a linked quota.

You can create multiple quota types on the same directory, but they must be of a different type or have a different snapshot option. You can specify quota types for any directory in OneFS and nest them within each other to create a hierarchy of complex storage-use policies.

Nested storage quotas can overlap. For example, the following quota settings ensure that the finance directory never exceeds 5 TB, while limiting the users in the finance department to 1 TB each:

  • Set a 5 TB hard quota on /ifs/data/finance.
  • Set 1 TB soft quotas on each user in the finance department.

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