When can I perform online capacity expansion without shutting down the cloud SSD?

Actually, a long time ago, through the Cloud API. The console has only recently been released.

Note that you need to manually expand the capacity of the file system on the ECS after the EVS disk is expanded without shutting down the ECS.

In the case of Windows ECSS, you need to scan the disks in the Disk Management on the Server Manager to view the new disk size. After scanning, click the expansion volume to adjust the disk size. When the volume is expanded, the disk I/O is blocked for about 10 seconds.

In the case of Linux ECSS, if no partition is used, you can use resize2fs to expand the capacity. If the partition is used, unmount the file system and then expand the partition and file system.

In addition, you are advised to create a snapshot for the EVS disk before expanding the file system to prevent the capacity expansion failure caused by file system problems.