You can share the screenshot of the GUI
I would suggest you to get some experience with this product line by going through Quick Spec and SMU guide.
Volume name will not help to understand the structure.
You need to check if you are checking from SMU V2 or SMU V3?
Please remember Volume created from Vdisk in case of Linear array but in case of Virtual array Volume gets created from Pool where Pool contains single or multiple VDG
Coming to your query, execute below command,
# show snapshots master-volume <Volume_name>
Try to delete snapshot if shows any from above output.
You can take help of command,
# delete snapshot force <Snap_name>
Once all snapshot cleared for Volume which you want to increase size then try the below option,
# convert master-to-std <Volume_name>
Also delete the Snap-Pool associated with the Volume,
# delete snap-pool <Snap_pool>
If volume part of Replication setup then need to delete replication set first before performing above operation. Please refer CLI guide (page no 110)
https://support.hpe.com/hpsc/doc/public/display?docId=c04957376
Then go for Volume expansion as suggested earlier
Hope this helps!
Regards
Subhajit
I am an HPE employee
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