On 06/26/2014 06:37 AM, Pierre Labastie wrote:
Le 26/06/2014 11:23, Marcos Menendez a écrit :
Hello,
I would like your advice in knowing which is the right partition to
define in the /etc/fstab file.
I ask it because when I´m in chroot I have this:
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 9.2G 4.1G 4.6G 48% /
devtmpfs 486M 152K 485M 1% /dev
tmpfs 486M 152K 485M 1% /dev/shm
devtmpfs 486M 152K 485M 1% /dev
tmpfs 499M 12K 499M 1% /run
and when I logout to the host I have:
# df -h
Filesystem Size Used Avail Use% Mounted on
/dev/sda1 9.7G 1.1G 8.1G 12% /
tmpfs 499M 0 499M 0% /dev/shm
/dev/sda2 9.2G 4.1G 4.6G 48% /mnt/lfs
tmpfs 499M 12K 499M 1% /mnt/lfs/run
As you see, in chroot the LFS partition corresponds to /dev/sda1 but
in the host it corresponds to /dev/sda2.
So, what should be the right one to choose?
Marcos
I'd guess the right one is /dev/sda2, and suspect a bug in "df" when
in chroot. You should know what you typed when you mounted /mnt/lfs:
the right partition is the one you gave to this command.
Actually, on my machine, in chroot I have (/mnt/lfs is mounted on an
LVM volume):
# df -h
df: « /mnt/virtualMachines »: Aucun fichier ou dossier de ce type
df: « /sys/fs/cgroup/systemd »: Aucun fichier ou dossier de ce type
df: « /run/user/1000/gvfs »: Aucun fichier ou dossier de ce type
Sys. de fichiers Taille Utilisé Dispo Uti% Monté sur
rootfs 9,8G 3,1G 6,2G 34% /
udev 10M 0 10M 0% /dev
/dev/sdb3 9,8G 3,1G 6,2G 34% /
/dev/sdb1 9,8G 3,1G 6,2G 34% /boot
tmpfs 7,9G 0 7,9G 0% /run/shm
/dev/mapper/vg-lfs 9,8G 3,1G 6,2G 34% /
udev 10M 0 10M 0% /dev
shm 7,9G 0 7,9G 0% /run/shm
Hmm, two different volumes for "/", and all with the same size
(actually, the size of /dev/mapper/vg-lfs)
----------------------
While the normal system gives:
$ df -h
Sys. de fichiers Taille Utilisé Dispo Uti% Monté sur
/dev/sdb3 154G 21G 125G 15% /
udev 10M 0 10M 0% /dev
tmpfs 1,6G 920K 1,6G 1% /run
tmpfs 5,0M 0 5,0M 0% /run/lock
tmpfs 9,1G 92K 9,1G 1% /run/shm
/dev/sdb1 180M 45M 127M 27% /boot
/dev/mapper/vg-home 30G 22G 6,8G 76% /home
/dev/mapper/vg-virtual 296G 169G 112G 61% /mnt/virtualMachines
/dev/sda2 464G 83G 381G 18% /mnt/windows
none 4,0K 0 4,0K 0% /sys/fs/cgroup
/dev/mapper/vg-lfs 9,8G 3,1G 6,2G 34% /mnt/lfs
-----------------
"cat /proc/mounts" gives roughly the same information, but the output
is harder to sort out. Here is the (trimmed) output when in chroot:
# cat /proc/mounts
rootfs / rootfs rw 0 0
[...]
/dev/disk/by-uuid/54f6e789-5bfb-4a56-aee9-da873ece10f6 / ext4
rw,relatime,data=ordered 0 0
[...]
/dev/sdb1 /boot ext3 rw,relatime,data=ordered 0 0
/dev/mapper/vg-home /home ext4 rw,relatime,data=ordered 0 0
/dev/mapper/vg-virtual /mnt/virtualMachines ext4
rw,relatime,data=ordered 0 0
/dev/sda2 /mnt/windows fuseblk
rw,relatime,user_id=0,group_id=0,default_permissions,allow_other,blksize=4096
0 0
[...]
/dev/mapper/vg-lfs / ext4 rw,relatime,data=ordered 0 0
[...]
-----------------------
to be complete:
# blkid /dev/sdb3
/dev/sdb3: UUID="54f6e789-5bfb-4a56-aee9-da873ece10f6" TYPE="ext4"
So again, there are 2 different volumes for "/"...
Pierre
Just a friendly reminder.
The purpose of "df" is to show the available space in *mounted*
filesystems. The command <df -h>, here df has no argument, show the
space available on all mounted *filesystems.* Its output is filesystems
and not devices.
I think what you're looking for is a utility to list the partition table
of your machine. <parted -l> will give you that list. I suggest parted
and not fdisk because I don't think fdisk recognizes gpt partitions
yet. If you know that your partition table is *not* gpt, fdisk will
work fine.
Using df to help write /etc/fstab is a good idea. But if you want all
of your partitions in it, df won't give you the complete picture.
Dan
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