From: Menion <menion@gmail.com>
To: linux-btrfs@vger.kernel.org
Subject: 14Gb of space lost after distro upgrade on BTFS root partition (long thread with logs)
Date: Tue, 28 Aug 2018 11:34:40 +0200 [thread overview]
Message-ID: <CAJVZm6fbXOrXieL-hBnd9fqVRH5GdJMmN2ahyzTKCcrOibGJeg@mail.gmail.com> (raw)
Hi all
I have run a distro upgrade on my Ubuntu 16.04 that runs ppa kernel
4.17.2 with btrfsprogs 4.17.0
The root filesystem is BTRFS single created by the Ubuntu Xenial
installer (so on kernel 4.4.0) on an internal mmc, located in
/dev/mmcblk0p3
After the upgrade I have cleaned apt cache and checked the free space,
the results were odd, following some checks (shrinked), followed by
more comments:
root@Menionubuntu:/home/menion# df -h
Filesystem Size Used Avail Use% Mounted on
...............................................................
/dev/mmcblk0p3 28G 24G 2.7G 90% /
root@Menionubuntu:/home/menion# btrfs fi usage /usr
Overall:
Device size: 27.07GiB
Device allocated: 25.28GiB
Device unallocated: 1.79GiB
Device missing: 0.00B
Used: 23.88GiB
Free (estimated): 2.69GiB (min: 2.69GiB)
Data ratio: 1.00
Metadata ratio: 1.00
Global reserve: 72.94MiB (used: 0.00B)
Data,single: Size:24.00GiB, Used:23.10GiB
/dev/mmcblk0p3 24.00GiB
Metadata,single: Size:1.25GiB, Used:801.97MiB
/dev/mmcblk0p3 1.25GiB
System,single: Size:32.00MiB, Used:16.00KiB
/dev/mmcblk0p3 32.00MiB
Unallocated:
/dev/mmcblk0p3 1.79GiB
root@Menionubuntu:/home/menion# btrfs fi df /mnt
Data, single: total=24.00GiB, used=23.10GiB
System, single: total=32.00MiB, used=16.00KiB
Metadata, single: total=1.25GiB, used=801.92MiB
GlobalReserve, single: total=72.89MiB, used=0.00B
The different ways to check the free space are coherent, but if I
check the directories usage on root, surprise:
root@Menionubuntu:/home/menion# du -x -s -h /*
17M /bin
189M /boot
36K /dead.letter
0 /dev
18M /etc
6.1G /home
4.0K /initrd.img
4.0K /initrd.img.old
791M /lib
8.3M /lib64
0 /media
4.0K /mnt
0 /opt
du: cannot access '/proc/24660/task/24660/fd/3': No such file or directory
du: cannot access '/proc/24660/task/24660/fdinfo/3': No such file or directory
du: cannot access '/proc/24660/fd/3': No such file or directory
du: cannot access '/proc/24660/fdinfo/3': No such file or directory
0 /proc
2.9M /root
2.9M /run
17M /sbin
4.0K /snap
0 /srv
0 /sys
0 /tmp
6.1G /usr
2.0G /var
4.0K /vmlinuz
4.0K /vmlinuz.old
4.0K /webmin-setup.out
The computed usage is 15Gb which is what I expected, so there are 9Gb
lost somewhere.
I have run scrub and then full balance with:
btrfs scrub start /
btrfs balance start /
The balance freed 100Mb of space, it was running in background so I
have checked dmesg when "btrfs balance status" said that was completed
dmesg of balance:
[47264.250141] BTRFS info (device mmcblk0p3): relocating block group
37154193408 flags system
[47264.592082] BTRFS info (device mmcblk0p3): relocating block group
36046897152 flags data
[47271.499809] BTRFS info (device mmcblk0p3): found 73 extents
[47272.329921] BTRFS info (device mmcblk0p3): found 60 extents
[47272.471059] BTRFS info (device mmcblk0p3): relocating block group
35778461696 flags metadata
[47280.530041] BTRFS info (device mmcblk0p3): found 3199 extents
[47280.735667] BTRFS info (device mmcblk0p3): relocating block group
34704719872 flags data
[47301.460523] BTRFS info (device mmcblk0p3): relocating block group
37221302272 flags data
[47306.038404] BTRFS info (device mmcblk0p3): found 5 extents
[47306.481371] BTRFS info (device mmcblk0p3): found 5 extents
[47306.673135] BTRFS info (device mmcblk0p3): relocating block group
37187747840 flags system
[47306.874874] BTRFS info (device mmcblk0p3): found 1 extents
[47307.073288] BTRFS info (device mmcblk0p3): relocating block group
34704719872 flags data
[47371.059074] BTRFS info (device mmcblk0p3): found 16258 extents
[47388.191208] BTRFS info (device mmcblk0p3): found 16094 extents
[47388.985462] BTRFS info (device mmcblk0p3): relocating block group
31215058944 flags metadata
[47439.164167] BTRFS info (device mmcblk0p3): found 7378 extents
[47440.163793] BTRFS info (device mmcblk0p3): relocating block group
30141317120 flags data
[47593.239048] BTRFS info (device mmcblk0p3): found 15636 extents
[47618.389357] BTRFS info (device mmcblk0p3): found 15634 extents
[47620.020122] BTRFS info (device mmcblk0p3): relocating block group
29012000768 flags data
[47637.708444] BTRFS info (device mmcblk0p3): found 1154 extents
[47639.757342] BTRFS info (device mmcblk0p3): found 1154 extents
[47640.375483] BTRFS info (device mmcblk0p3): relocating block group
27938258944 flags data
[47743.312441] BTRFS info (device mmcblk0p3): found 17009 extents
[47756.928461] BTRFS info (device mmcblk0p3): found 17005 extents
[47757.607346] BTRFS info (device mmcblk0p3): relocating block group
9416212480 flags metadata
[47825.819449] BTRFS info (device mmcblk0p3): found 11503 extents
[47826.465926] BTRFS info (device mmcblk0p3): relocating block group
8342470656 flags data
[47900.754062] BTRFS info (device mmcblk0p3): found 20607 extents
[47928.061348] BTRFS info (device mmcblk0p3): found 20607 extents
[47929.125750] BTRFS info (device mmcblk0p3): relocating block group
4852809728 flags metadata
[47993.308492] BTRFS info (device mmcblk0p3): found 13214 extents
[47994.883308] BTRFS info (device mmcblk0p3): relocating block group
3779067904 flags data
[48108.871895] BTRFS info (device mmcblk0p3): found 13256 extents
[48124.623607] BTRFS info (device mmcblk0p3): found 13255 extents
[48125.156150] BTRFS info (device mmcblk0p3): relocating block group
3510632448 flags metadata
[48191.030178] BTRFS info (device mmcblk0p3): found 12394 extents
[48193.202016] BTRFS info (device mmcblk0p3): relocating block group
2436890624 flags data
[48347.733120] BTRFS info (device mmcblk0p3): found 22889 extents
[48371.149135] BTRFS info (device mmcblk0p3): found 22889 extents
[48373.723037] BTRFS info (device mmcblk0p3): relocating block group
20971520 flags metadata
[48449.367016] BTRFS info (device mmcblk0p3): found 13755 extents
[48451.058818] BTRFS info (device mmcblk0p3): relocating block group
12582912 flags data
[48453.657685] BTRFS info (device mmcblk0p3): found 726 extents
[48461.188484] BTRFS info (device mmcblk0p3): found 726 extents
[48463.496116] BTRFS info (device mmcblk0p3): relocating block group
4194304 flags metadata
[48476.405722] BTRFS info (device mmcblk0p3): found 403 extents
[48479.254106] BTRFS info (device mmcblk0p3): 17 enospc errors during balance
There is this enospc errors, can anyone help me in understanding what
is going on?
Bye
next reply other threads:[~2018-08-28 13:26 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-08-28 9:34 Menion [this message]
2018-08-28 11:54 ` 14Gb of space lost after distro upgrade on BTFS root partition (long thread with logs) Qu Wenruo
2018-08-28 13:07 ` Menion
2018-08-28 13:22 ` Qu Wenruo
2018-08-28 13:47 ` Chris Murphy
2018-08-28 14:56 ` Menion
2018-08-28 15:27 ` Noah Massey
2018-08-28 15:47 ` Austin S. Hemmelgarn
2018-08-28 16:05 ` Noah Massey
2018-08-28 17:07 ` Austin S. Hemmelgarn
2018-08-28 17:25 ` Menion
2018-08-28 18:06 ` Noah Massey
[not found] ` <CAJVZm6dpfQghX+cCo=LkqZMAtFfCMKtq+XHpNGb6wH8z8eMcQA@mail.gmail.com>
2018-08-28 19:47 ` Austin S. Hemmelgarn
2018-08-29 0:16 ` Chris Murphy
2018-08-29 0:10 ` Chris Murphy
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=CAJVZm6fbXOrXieL-hBnd9fqVRH5GdJMmN2ahyzTKCcrOibGJeg@mail.gmail.com \
--to=menion@gmail.com \
--cc=linux-btrfs@vger.kernel.org \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).