Question

A systems administrator has a Btrfs filesystem mounted at /mnt/data (device /dev/sdb1). They want to isolate application logs into a dedicated Btrfs subvolume named 'logs' so it can later receive independent snapshots, and then mount that subvolume at /var/applog. Which sequence of commands accomplishes this correctly?

Accepted Answer

btrfs subvolume create /mnt/data/logs, then mount -o subvol=logs /dev/sdb1 /var/applog

Answer

mkfs.btrfs -L logs /dev/sdb1, then mount /dev/sdb1 /var/applog

Answer

lvcreate -n logs -L 10G btrfs_vg, then mount /dev/btrfs_vg/logs /var/applog

Answer

btrfs device add /dev/sdb1 /var/applog, then btrfs subvolume snapshot /mnt/data /var/applog