Understanding Stratis
As a new feature, to manage storage, Stratis was included in RHEL 8 as a technology preview (as of version 8.3 of RHEL). Stratis was created to manage local storage by combining a system service, stratisd, with the well-known tools in LVM (explained in Chapter 13, Flexible Storage Management with LVM) and the XFS filesystem (explained in Chapter 12, Managing Local Storage and Filesystems), which makes it very solid and reliable.
Important note
The filesystems/pools created with Stratis should always be managed with it, and not with the LVM/XFS tools. In the same way, already-created LVM volumes should not be managed with Stratis.
Stratis combines local disks into pools and then distributes the storage in filesystems, as shown in the following diagram:
Figure 14.1 – Stratis simplified architecture diagram
As can be seen, when compared to LVM, Stratis provides a much simpler and easy-to-understand interface to storage management...
