Re: ext4 no space left

[Victor Pelt <victor.pelt@gmail.com>]

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upgrading to 2.6.29-rc2-git1 did allow me to use most of the space but
i still can't quite use all of it. maybe this is to be expected.
(note: i'm just trying testing now, everything i used to have on my
old partition fits. i'm just trying to understand what exactly is
'full'. it seems the file system is 'holding something back'

i included a dumo of df, df -i and tune2fs -l /dev/hda2
(and partition that has ext4 is the / partition or /dev/hda2)

victor


On Wed, Jan 21, 2009 at 6:04 PM, Theodore Tso <tytso@mit.edu> wrote:
> On Wed, Jan 21, 2009 at 04:18:35PM +0100, Victor Pelt wrote:
>> i set the number mounted counter to 31, which forced fsck to run on
>> the next reboot. I rebooted, fsck didn't show any erros, but i still
>> got the no space left error when i tried to copy files to the
>> partition.
>
> OK, if a reboot didn't help, I'll bet I know what happened.  E2fsprogs
> changed the default default inode ratio, which means that number of
> inodes being created is half what it was previously.  If you do a "df
> -i", you'll probably see that you have exhausted the number of inodes
> in the filesystem.
>
> The default inode ratio controlled by /etc/mke2fs.conf, and is
> currently 16k.  That is, it assumes the average size of files on the
> filesystem is at least 16k.  (It previously was 8k.)  For large
> filesystems, this is not a problem; I'm guessing that you have a small
> root filesystem, and probably are using a hard-coded /dev partition,
> so the large number of (zero-length) device files is throwing off the
> average.  If you recreate the filesystem with mke2fs -I 8192, it
> should allow you to copy over all of your files in the root
> filesystem.
>
> Finally, note that we made this change for all ext2/3/4 filesystems,
> so this is not unique to ext4; it's just that you reformatted your
> root filesystem for the first time since upgrading to a newer
> e2fsprogs with the changed default, and you ran into this problem.  If
> there are enough people who are using small root filesystems, maybe
> we'll need to have some adjusted hueristics.  Right now we have
> "floppy" for filesystems less than 3 megs, "small" for filesystems
> less than 512 megs, and every thing else is default.  Maybe we need to
> have a "medium" for filesystems smaller than 10 gigs, perhaps, and use
> a default inode ratio of 8192 for medium-sized filesystems....
>
>                                                - Ted
>

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df

Filesystem           1K-blocks      Used Available Use% Mounted on
rootfs                 5044188   4725008     62944  99% /
/dev/root              5044188   4725008     62944  99% /
rc-svcdir                 1024       120       904  12% /lib/rc/init.d
udev                     10240        68     10172   1% /dev
cachedir                  4096         4      4092   1% /lib/splash/cache
none                    776804         0    776804   0% /dev/shm
/dev/hda3             24416008  22546040   1869968  93% /opt
/dev/hda6             11560764   9970208   1003300  91% /home
tmpfs                   776804         0    776804   0% /tmp
tmpfs                  1331200         0   1331200   0% /var/tmp
tmpfs                   776804         0    776804   0% /usr/portage/distfiles

df -i

Filesystem            Inodes   IUsed   IFree IUse% Mounted on
rootfs                320640  261978   58662   82% /
/dev/root             320640  261978   58662   82% /
rc-svcdir             194201      94  194107    1% /lib/rc/init.d
udev                  194201    1427  192774    1% /dev
cachedir              194201       2  194199    1% /lib/splash/cache
none                  194201       1  194200    1% /dev/shm
/dev/hda3            2066576   54161 2012415    3% /opt
/dev/hda6            1468800  559088  909712   39% /home
tmpfs                 194201       4  194197    1% /tmp
tmpfs                 194201       1  194200    1% /var/tmp
tmpfs                 194201       1  194200    1% /usr/portage/distfiles

tune2fs -l /dev/hda2

tune2fs 1.41.3 (12-Oct-2008)
Filesystem volume name:   <none>
Last mounted on:          <not available>
Filesystem UUID:          bd8da577-7b58-45bc-9c94-8254f718e55a
Filesystem magic number:  0xEF53
Filesystem revision #:    1 (dynamic)
Filesystem features:      has_journal ext_attr resize_inode dir_index filetype needs_recovery extent flex_bg sparse_super large_file huge_file uninit_bg dir_nlink extra_isize
Filesystem flags:         signed_directory_hash 
Default mount options:    (none)
Filesystem state:         clean
Errors behavior:          Continue
Filesystem OS type:       Linux
Inode count:              320640
Block count:              1281183
Reserved block count:     64059
Free blocks:              79795
Free inodes:              58662
First block:              0
Block size:               4096
Fragment size:            4096
Reserved GDT blocks:      312
Blocks per group:         32768
Fragments per group:      32768
Inodes per group:         8016
Inode blocks per group:   501
Flex block group size:    16
Filesystem created:       Tue Jan 20 15:29:58 2009
Last mount time:          Wed Jan 21 19:35:45 2009
Last write time:          Wed Jan 21 19:35:45 2009
Mount count:              10
Maximum mount count:      30
Last checked:             Wed Jan 21 00:49:50 2009
Check interval:           15552000 (6 months)
Next check after:         Mon Jul 20 01:49:50 2009
Reserved blocks uid:      0 (user root)
Reserved blocks gid:      0 (group root)
First inode:              11
Inode size:	          256
Required extra isize:     28
Desired extra isize:      28
Journal inode:            8
Default directory hash:   half_md4
Directory Hash Seed:      04df98fa-5851-4f24-b232-c8b4738aef0f
Journal backup:           inode blocks