Understanding Stratis:-
Learn Stratis–the advanced storage management in this video.
Stratis is designed to make, managing storage easier. You can easily set up and manage complex storage configurations integrated by the Stratis high-level system. So, stratis is a volume management file system and is Red Hat’s solution to Btrfs an ZFS.
Stratis also does have the implementation of some of the most important features of Btrfs and ZFS. If you don’t know about the Btrfs and ZFS file systems, do a brief research about them. One big difference is that on top of Stratis, a regular file system is needed and that is XFS by default.
Stratis basically is for advanced storage features and supports thin provisioning, file system snapshots and tiering. Stratis is made up of three types of objects—block devices, pool objects and file system.
Block devices are things like physical disk or a disk partition, LVM logical volumes, multipath devices, etc. The next is pool, which is composed of one or more block devices. A pool has a fixed total size, equal to the size of the block devices. The pool contains most Stratis layers, such as the non-volatile data cache using the dm-cache target.
Know that, Stratis is built on top of any block device including LVM devices but not on partitions.
The third object is file system. Each pool can contain one or more file systems, which store files. File systems are thinly provisioned and do not have a fixed total size. The actual size of a file system grows with the data stored on it. If the size of the data approaches the virtual size of the file system, Stratis grows the thin volume and the file system automatically. The file systems are formatted with XFS.
Let’s understand the architecture of Stratis.
Stratis creates a dev/stratis/my-pool/ directory for each pool. This directory contains links to devices that represent Stratis file systems in the pool.
Each pool can contain one or more file systems. Don’t be confused on the terminologies that, file systems and volumes are same things. As the file systems are thin provisioned, they don’t have a fixed size. The volume or the file system grows as more data is added to the system.
Okay friends, in the next video, we will see how to create Stratis volume in RHEL 8, that’s all for now, thanks for watching this video, see you in the next, until then have a nice time good bye !
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