some time ago (I think it started after my upgrade to 16.04) I started receiving notifications about going low with free space on the root partition.
First I thought that it might be due to packages kept within /var/cache after the upgrade, so I moved the folders to another partition and sym linked them to the original location. This helped but not for long. Then I noticed that I have quite a few old kernels and associated headers so I cleaned them up. This gave me about 1GB extra space, which then again disappeared.
These are my mountpoints and their current usage as shown by df -h
:
Filesystem Size Used Avail Use% Mounted on
udev 981M 0 981M 0% /dev
tmpfs 200M 19M 181M 10% /run
/dev/sda6 8.0G 8.0G 16M 100% /
/dev/sda7 32G 16G 17G 49% /usr
tmpfs 999M 300K 999M 1% /dev/shm
tmpfs 5.0M 8.0K 5.0M 1% /run/lock
tmpfs 999M 0 999M 0% /sys/fs/cgroup
/dev/sda9 270G 41G 216G 16% /repo
/dev/sda8 99G 91G 2.6G 98% /home
/dev/sda10 504G 162G 317G 34% /mnt/media
cgmfs 100K 0 100K 0% /run/cgmanager/fs
tmpfs 200M 64K 200M 1% /run/user/1000
/dev/sr2 48M 48M 0 100% /mnt/usb-HUAWEI_Mass_Storage-0:0
As you can see /
(/dev/sda6
) is practically full.
When I run sudo du -h -x --max-depth=1 /
I get:
469M /var
24M /etc
0 /media
13M /bin
54M /boot
326M /lib
198M /opt
6.9M /root
15M /sbin
0 /srv
8.0K /tmp
0 /cdrom
0 /mnt
0 /snap
1.1G /
which as far as I can tell shows me far less than 8GB being used.
I have been using linux on my desktop since the 90's, but apparently I am missing something here that I cannot explain. How do I find out what is consuming space on my /
?
[EDIT]: I tried solution presented here: https://serverfault.com/questions/406069/why-are-my-xfs-filesystems-suddenly-consuming-more-space-and-full-of-sparse-file (allocsize=64k option), but no space was freed.
[EDIT 2]:
Per Andrius's comment, output from xfs_db
:
magicnum = 0x58465342
blocksize = 4096
dblocks = 2096474
rblocks = 0
rextents = 0
uuid = 3a3ee397-d4e5-40f1-b179-94f3c0b566ac
logstart = 1048580
rootino = 128
rbmino = 129
rsumino = 130
rextsize = 1
agblocks = 524119
agcount = 4
rbmblocks = 0
logblocks = 2560
versionnum = 0xb4b4
sectsize = 512
inodesize = 256
inopblock = 16
fname = "u.root\000\000\000\000\000\000"
blocklog = 12
sectlog = 9
inodelog = 8
inopblog = 4
agblklog = 19
rextslog = 0
inprogress = 0
imax_pct = 25
icount = 60800
ifree = 27330
fdblocks = 2970
frextents = 0
uquotino = nic
gquotino = nic
qflags = 0
flags = 0
shared_vn = 0
inoalignmt = 2
unit = 0
width = 0
dirblklog = 0
logsectlog = 0
logsectsize = 0
logsunit = 1
features2 = 0x8
bad_features2 = 0x8