**Purpose**:
The purpose of this workflow is to illustrate the process of expanding storage for a Linux server that uses an iSCSI-based ZFS storage.  We want the VM to have more storage space, so this document will go over the steps to expand that usable space.

!!! info "Assumptions"
    It is assumed you are using an Ubuntu based operating system, as these commands may not be the same on other distributions of Linux.

    This document also assumes you did not enable Logical Volume Management (LVM) when deploying your server.  If you did, you will need to perform additional LVM-specific steps after increasing the space.

## Increase iSCSI Disk Size
This part should be fairly straight-forward.  Using whatever hypervisor/storage appliance hosting the iSCSI target, expand the disk space of the LUN to the desired size.

## Extend ZFS Pool
This step goes over how to increase the usable space of the ZFS pool within the server itself after it was expanded.

``` sh
iscsiadm -m session --rescan # (1)
parted /dev/sdX # (2)
unit TB # (3)
resizepart 1 XXTB # (4)
zpool online -e <POOL-NAME> /dev/sdX # (5)
zpool scrub <POOL-NAME> # (6)
```

1.  Re-scan iSCSI targets for changes.
2.  Open partitioning utility on the ZFS volume / LUN / iSCSI disk.  Replace `dev/sdX` with the actual device name.
3.  Self-explanatory storage measurement.
4.  Resizes whatever partition is given to fit the new storage capacity.  Replace `XXTB` with a valid value, such as `10TB`.
5.  Brings the ZFS Pool back online.  Replace `<POOL-NAME>` with the actual name of the ZFS pool.
6.  This tells the system to scan the ZFS pool for any errors or corruption and correct them.  Think of it as a form of housekeeping.