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21.11. Setting overprovisioning mode in Stratis file system

By default, every Stratis pool is overprovisioned meaning the logical file system size can exceed the physically allocated space. Stratis monitors the file system usage, and automatically increases the allocation by using available space when needed. However, if all the available space is already allocated and the pool is full, no additional space can be assigned to the file system.

注意

If the file system runs out of space, users might lose data. For applications where the risk of data loss outweighs the benefits of overprovisioning, this feature can be disabled.

Stratis continuously monitors the pool usage and reports the values using the D-Bus API. Storage administrators must monitor these values and add devices to the pool as needed to prevent it from reaching capacity.

Prerequisites

Procedure

  • To set up the pool correctly, you have two possibilities:

    • Create a pool from one or more block devices to make the pool fully provisioned at the time of creation: 

      # stratis pool create --no-overprovision pool-name /dev/sdb

    • By using the --no-overprovision option, the pool cannot allocate more logical space than actual available physical space.

      1. Set overprovisioning mode in the existing pool: 

        # stratis pool overprovision pool-name <yes|no>

        If set to "yes", you enable overprovisioning to the pool. This means that the sum of the logical sizes of the Stratis file systems, supported by the pool, can exceed the amount of available data space. If the pool is overprovisioned and the sum of the logical sizes of all the file systems exceeds the space available on the pool, then the system cannot turn off overprovisioning and returns an error.

Verification

  1. View the full list of Stratis pools: 

    # stratis pool list

Name       Total Physical                    Properties    UUID                                  Alerts
pool-name  1.42 TiB / 23.96 MiB / 1.42 TiB  ~Ca,~Cr,~Op    cb7cb4d8-9322-4ac4-a6fd-eb7ae9e1e540
  2. Check if there is an indication of the pool overprovisioning mode flag in the stratis pool list output. The " ~ " is a math symbol for "NOT", so ~Op means no-overprovisioning.

  3. Optional: Check overprovisioning on a specific pool: 

    # stratis pool overprovision pool-name yes

# stratis pool list

Name          Total Physical                    Properties     UUID                                   Alerts
pool-name     1.42 TiB / 23.96 MiB / 1.42 TiB   ~Ca,~Cr,~Op    cb7cb4d8-9322-4ac4-a6fd-eb7ae9e1e540
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