What is the difference between volume size and file system SSD storage in FSx for ONTAP?
Last updated: 2022-11-14
I'm able to provision an Amazon FSx for NetApp ONTAP volume larger than the size of the file system. What's the difference between the volume size and the file system SSD storage? How can I check the size of these on my file system?
After creating a new FSx for ONTAP volume, you might notice a difference between the file system size and the available space on the volume. The following are examples of these differences:
- You created a new FSx for ONTAP 1 TB volume, but only see 500 GB of available space on the volume.
- You have a 5TB Amazon FSx file system with 35 TB of volume. Initially, the volume size was 25 TB but was updated to 35 TB because of space issues.
These discrepancies might occur due to thin or thick provisioning.
FSx for NetApp ONTAP volumes created using the Amazon FSx console or the AWS Command Line Interface (AWS CLI) are thin provisioned. Volumes created using NetApp ONTAP CLI are thin provisioned by default. However, you can create thick provisioned volumes using the -space-slo thick command. In the following example command, replace SVM_name and volume_name with the correct values for your use case.
> volume create -vserver SVM_name -volume volume_name -aggregate aggr1 -size 10G -space-slo thick
Check the SSD storage
In an FSx for ONTAP file system, the SSD storage provisioned for the volumes is called an aggregate. The aggregate is a collection of disks arranged in multiple RAID groups. Use the df -A -h command to check the SSD storage space available in your file system:
> df -A -h Aggregate total used avail capacity aggr0_FsxId04598b6f90a5cb303_01 117GB 74GB 43GB 63% aggr0_FsxId04598b6f90a5cb303_01/.snapshot 6349MB 20KB 6349MB 0% aggr0_FsxId04598b6f90a5cb303_02 117GB 73GB 44GB 62% aggr0_FsxId04598b6f90a5cb303_02/.snapshot 6349MB 20KB 6349MB 0% aggr1 861GB 8165MB 853GB 1% aggr1/.snapshot 45GB 20KB 45GB 0% 6 entries were displayed.
Note: FSx for ONTAP file systems require root aggregate for file system management. Root aggregate in FSx for ONTAP starts with aggr0, which isn't available for user data storage. The root aggregate aggr1 is the user data aggregate where the customer volumes are provisioned and data is stored.
Check the volume storage
Use the df -h command to check the volume size:
> df -h Filesystem total used avail capacity Mounted on Vserver /vol/vol_kumo/ 9728GB 344KB 853GB 0% /vol_kumo test_qtree /vol/vol_kumo/.snapshot 512GB 0B 512GB 0% /vol_kumo/.snapshot test_qtree
In the preceding example, the volume vol_kumo is 9.7 TB and the available size is 853 GB. 853 GB equals the available aggregate size shown for aggr1.
If the SSD storage is full you can increase the file system or SSD size.
Note: You can't decrease a file system's size. Instead, you must create a new file system with a smaller size.
Additional commands you can use the verify the space used at the aggregate and the volume at a more granular level.
> aggr show-space aggr1 > volume show-space <volume name>
Configure volume provisioning options on the NetApp website
FAQ: Over-provisioning aka thin provisioning in ONTAP on the NetApp Knowledge Base