Healthy Server

Note that the PD is mounted in two locations.

$ df -h | grep redis
/dev/disk/by-id/google-redis-3-storage                  493G   11G  457G   3% /var/lib/kubelet/global/pd/rw/redis-3-storage
/dev/disk/by-id/google-redis-3-storage                  493G   11G  457G   3% /var/lib/kubelet/redis-3/volumes/gce-pd/redis-master-storage

Rebooted Server

Note there is no /var/lib/kubelet/redis-1/... 

$ df -h | grep redis
/dev/disk/by-id/google-redis-1-storage                  493G  5.3G  462G   2% /var/lib/kubelet/global/pd/rw/redis-1-storage

But it exists as a dir on the / partition

$ ls -al /var/lib/kubelet/redis-1
total 12
drwxr-x--- 3 root root 4096 Jan 14 00:14 .
drwxr-x--- 6 root root 4096 Jan 14 00:14 ..
drwxr-x--- 3 root root 4096 Jan 14 00:14 volumes