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2019-08-08 06:00:25 -0500 问了问题 Do not create a new volume when creating a new instance from horizon

I create a new instance called "test", and do not create a new volume. I can get access from the console, and can not access from Xshell. As we all know, a volume is used for storing permanently, but the instance do not have a volume. I created a folder called 'new-folder' at /root, and then reboot the instance. After booting successfully, surprisingly, I can see the 'new-folder'. It seems like contradiction. Can you explain for me? Thanks for your attention.