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Alexander
Asked: 2012-02-21 21:48:18 +0800 CST

FreeBSD: How to know real file size on zfs with compression on?

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I'm using zfs on my FreeBSD 9.0 x64 and pretty happy with it, but I find it hard to count directory real, not compressed, size.

Surely I can walk over the directory and count every file size with ls, but I'd expect some extra key for du for that purpose.

So, how can I tell the directory size for dir placed on zfs with compression on?

Thamk you in advance for the advice, I simple can't rememeber there is no such a 'simple' way, without 'find ./ -type d -exec ls -l '{}' \; | awk ...'!

freebsd zfs find ls du

3 Answers

  1. Best Answer

    Use the du with its -A flag:

    root@pg78:/usr/local/pgsql/data/base/218204 # du -A -h 221350.219
1.0G    221350.219
root@pg78:/usr/local/pgsql/data/base/218204 # du -h 221350.219
501M    221350.219

    Very handy. It even works with -d for recursive goodness:

    root@pg78:/usr/local/pgsql/data/base # du -h -c -d0 .
387G    .
387G    total
root@pg78:/usr/local/pgsql/data/base # du  -A -h -c -d0 .
518G    .
518G    total
    • 30

  2. You could install the GNU version of du(1):

    cd /usr/ports/sysutils/coreutils && make install clean

    Then you can use the --apparent-size flag:

    /space# zfs create space/comptest
/space# zfs set compression=on space/comptest
/space# dd if=/dev/zero of=/space/comptest/zerofile bs=1M count=40
/space/comptest# gdu
2K      .
/space/comptest# gdu --apparent-size
40961K  .
    • 14

  3. try to use zpool command :

    zpool list
NAME      SIZE  ALLOC   FREE  EXPANDSZ   FRAG    CAP  DEDUP  HEALTH  ALTROOT
storage  8.93T  6.59T  2.34T         -    60%    73%  2.13x  ONLINE  -

    but df -sh shows resulting (not deduplicated size)

    df -hT
Filesystem     Type      Size  Used Avail Use% Mounted on
storage        zfs        16T   14T  1.9T  89% /storage
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