Update Servers/Virtualization/Proxmox/Configuring iSCSI-based Cluster Storage.md

Servers/Virtualization/Proxmox/Configuring iSCSI-based Cluster Storage.md

@@ -8,8 +8,6 @@ This approach is intended to:
 - Avoid third-party plugins or middleware
 - Be fully reproducible via CLI
 
----
-
 ## Assumptions
 - TrueNAS **CORE** (not SCALE)
 - ZFS pool already exists and is healthy
@@ -21,8 +19,6 @@ This approach is intended to:
 !!! warning "Important"
     `volblocksize` **cannot be changed after zvol creation**. Choose carefully.
 
----
-
 ## Target Architecture
 
 ```
@@ -34,14 +30,12 @@ ZFS Pool
              └─ VM Disks
 ```
 
----
-
 ## Step 1 – Create a Dedicated Zvol for Proxmox
 
 ### Variables
 Adjust as needed before execution.
 
-```
+```sh
 POOL_NAME="CLUSTER-STORAGE"
 ZVOL_NAME="iscsi-proxmox"
 ZVOL_SIZE="14T"
@@ -49,7 +43,7 @@ VOLBLOCKSIZE="16K"
 ```
 
 ### Create the Zvol (Thick-Provisioned)
-```
+```sh
 zfs create -V ${ZVOL_SIZE} \
   -o volblocksize=${VOLBLOCKSIZE} \
   -o compression=lz4 \
@@ -63,110 +57,66 @@ zfs create -V ${ZVOL_SIZE} \
 ---
 
 ## Step 2 – Configure iSCSI Target (TrueNAS CLI)
-
-### Enable iSCSI Service
-```
+```sh
+# Enable iSCSI Service
 service iscsitarget start
 sysrc iscsitarget_enable=YES
-```
 
----
-
-### Create iSCSI Portal
-```
+# Create iSCSI Portal
 ctladm create -p 0.0.0.0
-```
 
----
-
-### Create Target
-```
+# Create Target
 ctladm create -t proxmox-target
-```
 
----
-
-### Create Extent
-```
-ctladm create -b block \
-  -l /dev/zvol/${POOL_NAME}/${ZVOL_NAME} \
-  proxmox-extent
-```
-
----
+# Create Extent
+ctladm create -b block -l /dev/zvol/${POOL_NAME}/${ZVOL_NAME} proxmox-extent
 
 ### Associate Target + Extent
-```
 ctladm add -t proxmox-target -l proxmox-extent
 ```
 
 !!! tip
     At this point, the LUN is live and can be discovered by initiators.
 
----
-
 ## Step 3 – Connect from Proxmox VE Nodes
 
 Perform the following **on each Proxmox node**.
-
-### Install iSCSI Utilities
-```
+```sh
+# Install iSCSI Utilities
 apt update
 apt install -y open-iscsi lvm2
-```
 
----
-
-### Discover Target
-```
+# Discover Target
 iscsiadm -m discovery -t sendtargets -p <TRUENAS_IP>
-```
 
----
-
-### Log In
-```
+# Log In
 iscsiadm -m node --login
-```
-
----
 
 ### Verify Device
-```
 lsblk
 ```
 
----
-
 ## Step 4 – Create Shared LVM (One Node Only)
 
 !!! warning "Important"
     **Only run LVM creation on ONE node**. All other nodes will only scan.
 
-### Initialize Physical Volume
-```
+```sh
+# Initialize Physical Volume
 pvcreate /dev/sdX
-```
 
----
-
-### Create Volume Group
-```
+# Create Volume Group
 vgcreate vg_proxmox_iscsi /dev/sdX
 ```
 
----
-
 ## Step 5 – Register Storage in Proxmox
 
 ### Rescan LVM (Other Nodes)
-```
+```sh
 pvscan
 vgscan
 ```
 
----
-
 ### Add Storage (GUI or CLI)
 
 **Datacenter → Storage → Add → LVM**
@@ -176,8 +126,6 @@ vgscan
 - Content: `Disk image`
 - Shared: ✔️
 
----
-
 ## Step 6 – Validation
 
 - Snapshot create / revert / delete
@@ -187,34 +135,19 @@ vgscan
 !!! success
     If all validation tests pass, the storage is production-ready.
 
----
-
 ## Step 7 – Decommission NFS (After Cutover)
 
-```
+```sh
 zfs destroy CLUSTER-STORAGE/NFS-STORAGE
 ```
 
----
-
 ## Step 8 – Expand iSCSI Storage (No Downtime)
 
-### Expand Zvol (TrueNAS)
-```
+```sh
+# Expand Zvol (TrueNAS)
 zfs set volsize=16T CLUSTER-STORAGE/iscsi-proxmox
 zfs set refreservation=16T CLUSTER-STORAGE/iscsi-proxmox
-```
 
----
-
-### Rescan on Proxmox Nodes
-```
+# Rescan on Proxmox Nodes
 pvresize /dev/sdX
-```
-
----
-
-## Final Notes
-- Maintain ≥15–20% free pool capacity
-- Monitor pool usage and fragmentation
-- Prefer PBS restores for large migrations
+```