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Chapter 25. 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.

25.1. Displaying information about Stratis file systems
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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  Tier	UUID
my-pool     /dev/sdb     9.10 TiB       Data    ec9fb718-f83c-11ef-861e-7446a09dccfb
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  • To display information about all Stratis pools on your system: 

    # stratis pool

Name     Total/Used/Free		            Properties  UUID	                              Alerts
my-pool  8.00 GiB / 800.99 MiB / 7.22 GiB  -Ca,-Cr,Op   e22772c2-afe9-446c-9be5-2f78f682284e  WS001
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  • To display information about all Stratis file systems on your system: 

    # stratis filesystem

Pool	Filesystem  Total/Used/Free/Limit		          Device		             UUID
Spool1  sfs1		1 TiB / 546 MiB / 1023.47 GiB / None  /dev/stratis/spool1/sfs1   223265f5-8f17-4cc2-bf12-c3e9e71ff7bf
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You can also display detailed information about a Stratis file system on your system by specifying the file system name or UUID: 

# stratis filesystem list my-pool --name my-fs

UUID: 47255008-9bc7-4bd2-8294-e9d25cd9e7ba
Name: my-fs
Pool: my-pool
Device: /dev/stratis/my-pool/my-fs
Created: Nov 08 2018 08:03
Snapshot origin: None
Sizes:
	Logical size of thin device: 1 TiB
	Total used (including XFS metadata): 546 MiB
	Free: 1023.47 GiB
 Size Limit: None
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25.2. Viewing a Stratis pool by using the web console
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You can use the web console to view an existing Stratis pool and the file systems it contains.

Prerequisites

  • You have installed the RHEL 9 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 9 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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