Add Workflows/Linux/Expand iSCSI-Based ZFS Filesystem.md

Workflows/Linux/Expand iSCSI-Based ZFS Filesystem.md

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+**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.