I am running Ubuntu 12.04 (ext4) and installed Ubuntu 13.10 on a partition of its own (sda2) with btrfs. I had no time to configure 13.10 to my work environment (yet), so I mounted /dev/sda2 from 12.04 and want to benchmark from there.

But I see directories @ and @home in the root, not the usual /dev, /usr, /lib I am used to. Why is this?


Those are the default (for Ubuntu) subvolumes: https://help.ubuntu.com/community/btrfs#Ubuntu-specific_subvolume_layout_in_11.04_and_later

You should take care that 12.04 does not have a recommended kernel for btrfs, 13.10 does have one. There might be performance differences.

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