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No more space left on device issue

From: Maxim Cournoyer
Subject: No more space left on device issue
Date: Sun, 18 Dec 2016 11:16:52 -0800
User-agent: Gnus/5.13 (Gnus v5.13) Emacs/25.1 (gnu/linux)

Hello Guix,

I've had this issue before but couldn't understand what was happening at
the time. At that time, I simply resized my filesystem then ran the
garbage collector.

$ touch /tmp/test.txt
touch: cannot touch '/tmp/test.txt': No space left on device

$ df -h
Filesystem      Size  Used Avail Use% Mounted on
none            1.9G     0  1.9G   0% /dev
/dev/sda1        37G   25G   11G  71% /
tmpfs           1.9G     0  1.9G   0% /dev/shm
cgroup          1.9G     0  1.9G   0% /sys/fs/cgroup
none            1.9G   12K  1.9G   1% /run/systemd
none            1.9G     0  1.9G   0% /run/user
tmpfs           376M     0  376M   0% /run/user/1000

In the #guix channel, jmd suggested that this might be an inode issue:

$ sudo tune2fs -l /dev/sda1
tune2fs 1.42.13 (17-May-2015)
Filesystem volume name:   my-root
Last mounted on:          /
Filesystem UUID:          2b2b35a6-8f47-4fc2-9700-bda7fc1044cd
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype 
needs_recovery extent 64bit flex_bg sparse_super large_file huge_file dir_nlink 
Filesystem flags:         signed_directory_hash 
Default mount options:    user_xattr acl
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              2445984
Block count:              9764864
Reserved block count:     488242
Free blocks:              3183059
Free inodes:              23
First block:              0
Block size:               4096
Fragment size:            4096
Group descriptor size:    64
Reserved GDT blocks:      1024
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8208
Inode blocks per group:   513
Flex block group size:    16
Filesystem created:       Tue Nov  1 08:38:50 2016
Last mount time:          Sun Dec 18 10:47:37 2016
Last write time:          Sun Dec 18 10:47:37 2016
Mount count:              20
Maximum mount count:      -1
Last checked:             Tue Nov  1 08:38:50 2016
Check interval:           0 (<none>)
Lifetime writes:          146 GB
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:               256
Required extra isize:     32
Desired extra isize:      32
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      330c34f4-9c29-4b59-bb21-d8d00770e2e7
Journal backup:           inode blocks
It does seem like it is; the "Free inodes" count is very low at 23 and
this is only refreshed at the time the filesystem is mounted (since I
last booted).

jmd also requests that I post this information here so that the
configuration of the GuixSD filesystem settings can be discussed. With
the store being very inode intensive, there might be something to tweak?



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