The following points need to be considered when you add new storage volume.
A compute node can have a maximum of ten storage volumes attached to it.
You can create a storage volume from 1 GB to 2048 GB in size, in increments of 1 GB.
If the database deployment to which you attach this temporary storage is restarted or is stopped and then started, the storage volume becomes detached from the compute node and you must reattach it.
After reattaching the storage volume, you must then connect to the compute node and remount it.
If the compute node is rebooted, such as when following the instructions in Rebooting a Compute Node , the temporary storage becomes unmounted and you must remount it.
You can attach storage volume to the node from compute classic .You need to select correct site to show instance.