Merge pull request #309701 from netapp-manishc/cache-volumes-resize-guidelines

Adding resizing guidelines

Author: v-ccolin

articles/azure-netapp-files/TOC.yml

@@ -193,6 +193,8 @@
       items: 
       - name: Understand Azure NetApp Files cache volumes
         href: cache-volumes.md    
+      - name: Understand resizing guidelines for cache volumes
+        href: cache-volumes-resize-guidelines.md  
     - name: Azure NetApp Files backup
       items: 
       - name: Understand Azure NetApp Files backup

articles/azure-netapp-files/cache-volumes-resize-guidelines.md

@@ -0,0 +1,66 @@
+---
+title: Understand resizing guidelines for cache volumes in Azure NetApp Files
+description: Describes the resizing guidelines you must be aware of before resizing a cache volume.
+services: azure-netapp-files
+author: netapp-manishc
+ms.service: azure-netapp-files
+ms.topic: concept-article
+ms.date: 12/18/2025
+ms.author: anfdocs
+ms.custom: references_regions
+# Customer intent: As a data administrator, I want to understand the guidelines to resize a cache volume.
+---
+
+# Understand resizing guidelines for cache volumes in Azure NetApp Files
+
+This article describes the guidelines you need to be aware of before resizing an Azure NetApp Files cache volume.
+
+When a cache volume is created, one or more constituent volumes (CVs) are provisioned based on the size and the service level. The resize range of a cache volume is based on the number of CVs provisioned at creation time and the CV count cannot be changed.
+
+The following table shows CV count, minimum and maximum cache volume size and resize ranges per service level:
+
+|  Service Level | CV count | Cache Size at Creation (Minimum GiB) | Cache Size at Creation (Maximum GiB) | Resize Range (Minimum GiB) | Resize Range (Maximum GiB)  |
+|:---: |:---:|:---: |:---: |:---: |:---: |
+|     Standard     |      1     |      50        |     99           |       50        |        307,200        |
+|                  |      2     |      100       |     1,023        |       100       |        614,400        |
+|                  |      4     |      1,024     |     10,239       |       200       |        1,048,576      |
+|                  |      8     |      10,240    |     25,843       |       800       |        1,048,576      |
+|                  |      12    |      25,844    |     65,226       |       1,800     |        1,048,576      |
+|                  |      16    |      65,227    |     164,622      |       3,200     |        1,048,576      |
+|                  |      20    |      164,623   |     415,483      |       5,000     |        1,048,576      |
+|                  |      24    |      415,484   |     1,048,576    |       7,200     |        1,048,576      |
+|  Service Level | CV count | Cache Size at Creation (Minimum GiB)  | Cache Size at Creation (Maximum GiB) | Resize Range (Minimum GiB) | Resize Range (Maximum GiB)  |
+|     Premium      |      1     |      50        |     99           |       50        |        307,200        |
+|                  |      2     |      100       |     1,023        |       100       |        614,400        |
+|                  |      4     |      1,024     |     10,239       |       200       |        1,048,576      |
+|                  |      8     |      10,240    |     22,148       |       400       |        1,048,576      |
+|                  |      16    |      22,149    |     47,905       |       1,600     |        1,048,576      |
+|                  |      24    |      47,906    |    103,618       |       3,600     |        1,048,576      |
+|                  |      32    |      103,619   |     224,122      |       6,400     |        1,048,576      |
+|                  |      40    |      224,123   |     484,765      |       10,000    |        1,048,576      |
+|                  |      48    |      484,766   |     1,048,576    |       14,400    |        1,048,576      |
+|  Service Level   | CV count   | Cache Size at Creation (Minimum GiB) | Cache Size at Creation (Maximum GiB) | Resize Range (Minimum GiB) | Resize Range (Maximum GiB)  |
+| Ultra, Flexible  |      1     |      50        |     99           |       50        |        307,200        |
+|                  |      2     |      100       |     1,023        |       100       |        614,400        |
+|                  |      4     |      1,024     |     10,239       |       200       |        1,048,576      |
+|                  |      8     |      10,240    |     19,836       |       400       |        1,048,576      |
+|                  |      16    |      19,837    |     38,429       |       800       |        1,048,576      |
+|                  |      32    |      38,430    |    74,448        |       3,200     |        1,048,576      |
+|                  |      48    |      74,449    |     144,225      |       7,200     |        1,048,576      |
+|                  |      64    |      144,226   |     279,400      |       12,800    |        1,048,576      |
+|                  |      80    |      279,401   |     541,269      |       20,000    |        1,048,576      |
+|                  |      96    |      541,270   |     1,048,576    |       28,800    |        1,048,576      |
+
+
+**Example:**
+
+* Cache volume size at creation = 12,288 GiB
+* CV Count = 8
+* Service level = Premium
+* Cache volume size can be decreased to 400 GiB
+* Cache volume size can be increased to 1,048,576 GiB
+
+If the desired size is larger or smaller than the resize range for that cache volume, then a new cache volume needs to be created with the desired size.
+
+
+