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All About Resizing ZFS Filesystem

In virtual environments, managing storage space efficiently helps ensure optimal performance and meet growing demands. This is where ZFS steps in.

ZFS is a powerful file system and volume manager. It offers several features that make it popular. However, when working with a single disk Zpool, expanding storage capacity can be challenging. Today, we are going to explore how to expand a single disk Zpool using ZFS on Linux.

In virtual environments, we often need to expand storage capacity without compromising data integrity. Usually, this can be done by adding a second disk and creating a RAID 0 setup, but this approach has its limitations.

Fortunately, ZFS on Linux supports resizing or autoexpanding single-disk Zpools, providing a better solution for expanding storage space.

How to resize ZFS Filesystem

1. First, we have to enable Autoexpand on Zpool with this command:

   zpool set autoexpand=on Zpoolname

   Where we have to replace Zpooname with the name of the Zpool.
2. Next, we have to extend the disk associated with the Zpool to the desired size with Virtual Host tools. This involves checking if the disk can accommodate the expanded Zpool.
3. Then, we have to identify the name of the disk in our Zpool, with this command:

   zpool status

   This will display the details of our Zpool, including the disk name.
4. Now, it is time to run the “parted” utility to resize the partition with these commands:

   parted /dev/sdb

   Where we have to replace “/dev/sdb” with the actual disk name from the previous step.
5. Then, we have to enter these commands in the parted prompt:

   resizepart

   This will prompt us to enter the partition number, and then it will default to the maximum available size.
6. We can exit the parted utility with the quit command.
7. Finally, it is time to instruct the Zpool to expand with this command:

   zpool online -e Zpoolname sdb

   where Zpoolname is the name of the Zpool, and sdb is the disk that we extended.

After the above steps, we can verify the partition is larger with the df command as seen below:

df -h

This will display the updated storage capacity.

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Conclusion

In summary, our Support Techs demonstrated how to resize the ZFS filesystem