fsckコマンドを実行する前にummountするファイル

Question

GMOのVPSで不具合が発生したためfsckを実行する必要があります。
事前にfsck -nすると

fsck from util-linux-ng 2.17.2
e2fsck 1.41.12 (17-May-2010)
Warning! /dev/vda1 is mounted.
Warning: skipping journal recovery because doing a read-only filesystem check.
/dev/vda1 contains a file system with errors, check forced.
Pass 1: Checking inodes, blocks, and sizes
Inodes that were part of a corrupted orphan linked list found. Fix? no

Inode 5079141 was part of the orphaned inode list. IGNORED.
Pass 2: Checking directory structure
Pass 3: Checking directory connectivity
Pass 4: Checking reference counts
Pass 5: Checking group summary information
Block bitmap differences: -10068317
Fix? no

Free blocks count wrong for group #307 (28947, counted=28946).
Fix? no

Free blocks count wrong (24971071, counted=24970904).
Fix? no

Free inodes count wrong (12896880, counted=12896872).
Fix? no

/dev/vda1: ********** WARNING: Filesystem still has errors **********

/dev/vda1: 79248/12976128 files (0.4% non-contiguous), 981169/25952240 blocks

上記が表示されました。
unmountするのは/dev/vda1だけでよいのでしょうか？
ディレクトリ構成は以下の通りです。

ls /

bin boot cgroup config crypt dev etc home lib lib64 lost+found media mnt opt proc root sbin selinux srv sys tmp usr var