vSZ on Azure is not showing full disk capacity after increasing the disk space
Summary
When increasing disk space for vSZ on Azure, resizing the OS disk is required. Adding or resizing a data disk will not affect vSZ because data disks are not utilized by vSZ by design.Question
show diskinfo command displays much less (e.g., 127 GB). What causes this and how can it be resolved?Customer Environment
vSZ-H running on AzureSymptoms
show diskinfo still shows the original OS disk size (e.g., 127 GB).Root Cause
vSZ does not use data disks in Azure. It only utilizes the OS disk for storage. Adding a data disk will not increase the disk space available to vSZ.Troubleshooting Steps
-
Verified VM was powered off during disk addition.
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Rebooted vSZ instance ? No change in reported disk size.
Resolution
Adding a "data disk" on Azure will not make itself available to the vSZ and therefore "show disk" will not show the disk size offered by the data disk. Instead, if the disk space needs to be resized, it should be done on the OS disk instead of the data disk.
Following are the steps that you can follow to re-size the OS disk from Azure Portal -
Important Note - You must take a VM backup before re-sizing the disk. Also, this's as per RUCKUS's best awareness of this procedure as of this writing. Please check Azure documentation for extra-assurance.
- Gracefully shutdown the vSZ instance using CLI command "shutdown now"
- Navigate to Azure Portal (https://portal.azure.com)
- In the VM's left-hand menu, click on "Disks" under "Settings"
- Identify the OS disk and click on it.
- Click "Size + performance" under "Settings"
- Scroll down the page to button, update the size to your requirement in the "Custom disk size" field
- Save the changes and restart the VM
- Verify the available disk from SZ CLI "show diskinfo" command
Article Number:
000014766
Updated:
December 19, 2025 10:42 AM (5 months ago)
Tags:
Troubleshooting, Installation, Known Issues and Workarounds, SmartCell Gateway
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