zfs directory size accounting
Richard Kearsley
richard at kearsley.me
Tue Jan 6 10:40:08 UTC 2015
Hello
In my system I am using a subdirectory structure to store millions of
files, like
0-f/0-f/0-f/0-f/0-f/file.ext
I have recently discovered that the size of the directory itself (not
including the files within it) is variable for some reason - I has the
understanding that it was a fixed size
for example:
0/0/0/0 # ls -als
total 564
9 drwxr-xr-x 16 root wheel 16 Jan 3 13:57 .
9 drwxr-xr-x 18 root wheel 18 Feb 18 2014 ..
25 drwxr-xr-x 2 root wheel 6 Jan 5 17:52 2
25 drwxr-xr-x 2 root wheel 8 Jan 5 17:52 3
25 drwxr-xr-x 2 root wheel 4 Jan 5 17:31 4
25 drwxr-xr-x 2 root wheel 2 Jan 3 04:36 5
25 drwxr-xr-x 2 root wheel 6 Dec 29 21:47 6
25 drwxr-xr-x 2 root wheel 6 Jan 3 18:39 7
25 drwxr-xr-x 2 root wheel 17 Jan 4 15:43 8
93 drwxr-xr-x 2 root wheel 4 Jan 4 03:57 9
25 drwxr-xr-x 2 root wheel 8 Jan 3 22:01 a
93 drwxr-xr-x 2 root wheel 5 Jan 3 20:18 b
25 drwxr-xr-x 2 root wheel 8 Jan 5 18:04 c
93 drwxr-xr-x 2 root wheel 9 Jan 5 16:25 d
25 drwxr-xr-x 2 root wheel 6 Jan 4 08:02 e
25 drwxr-xr-x 2 root wheel 10 Jan 4 18:56 f
I believe the block count (first number) in particular makes a big
difference on filesystem space usage which is potentially a problem for me
0/0/0/0 # stat b 1598987375 6362113 drwxr-xr-x 2 root wheel 4294967295 5
"Oct 5 01:07:43 2014" "Jan 3 20:18:04 2015" "Jan 3 20:18:04 2015" "Oct 5
01:07:43 2014" 16384 185 0 b
directory 'b' is using 185 512-byte blocks - 94720 bytes!... why?
Many thanks
Richard
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