Chapter 26. Monitoring Stratis file systems


As a Stratis user, you can view information about Stratis file systems on your system to monitor their state and free space.

Important

Stratis is a Technology Preview feature only. Technology Preview features are not supported with Red Hat production service level agreements (SLAs) and might not be functionally complete. Red Hat does not recommend using them in production. These features provide early access to upcoming product features, enabling customers to test functionality and provide feedback during the development process. For more information about the support scope of Red Hat Technology Preview features, see https://access.redhat.com/support/offerings/techpreview.

26.1. Displaying information about Stratis file systems

You can list statistics about your Stratis file systems, such as the total, used, and free size or file systems and block devices belonging to a pool, by using the stratis utility.

The size of an XFS file system is the total amount of user data that it can manage. On a thinly provisioned Stratis pool, a Stratis file system can appear to have a size that is larger than the space allocated to it. The XFS file system is sized to match this apparent size, which means it is usually larger than the allocated space. Standard Linux utilities, such as df, report the size of the XFS file system. This value generally overestimates the space required by the XFS file system and hence the space allocated for it by Stratis.

Important

Regularly monitor the usage of your overprovisioned Stratis pools. If a file system usage approaches the allocated space, Stratis automatically increases the allocation using available space in the pool. However, if all the available space is already allocated and the pool is full, no additional space can be assigned causing the file system to run out of space. This may lead to the risk of data loss in the application using the Stratis file system.

Prerequisites

  • Stratis is installed and the stratisd service is running. For more information, See Installing Stratis.

Procedure

  • To display information about all block devices used for Stratis on your system:

    # stratis blockdev
    
    Pool Name   Device Node  Physical Size  State   Tier
    my-pool     /dev/sdb     9.10 TiB       In-use  Data
    Copy to Clipboard
  • To display information about all Stratis pools on your system:

    # stratis pool
    
    Name    Total Physical Size  Total Physical Used
    my-pool            9.10 TiB              598 MiB
    Copy to Clipboard
  • To display information about all Stratis file systems on your system:

    # stratis filesystem
    
    Pool Name  Name  Used     Created            Device
    my-pool    my-fs 546 MiB  Nov 08 2018 08:03  /dev/stratis/my-pool/my-fs
    Copy to Clipboard

26.2. Viewing a Stratis pool by using the web console

You can use the web console to view an existing Stratis pool and the file systems it contains.

Prerequisites

  • You have installed the RHEL 8 web console.
  • You have enabled the cockpit service.
  • Your user account is allowed to log in to the web console.

    For instructions, see Installing and enabling the web console.

  • The stratisd service is running.
  • You have an existing Stratis pool.

Procedure

  1. Log in to the RHEL 8 web console.
  2. Click Storage.
  3. In the Storage table, click the Stratis pool you want to view.

    The Stratis pool page displays all the information about the pool and the file systems that you created in the pool.

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