Chavdar Ivanov schrieb:
> Hi,
>
> I BFUd successfully snv_128 over snv_125:
>
> ---
> # cat /etc/release
> Solaris Express Community Edition snv_125 X86
> Copyright 2009 Sun Microsystems, Inc. All Rights Reserved.
> Use is subject to license terms.
> Assembled 05 October 2009
> # uname -a
> SunOS cheeky 5.11 snv_128 i86pc i386 i86pc
> ...
>
> being impatient to test zfs dedup. I was able to set dedup=on (I presume with
> the default sha256 key) on a few filesystems and did the following trivial
> test (this is an edited script session):
>
> Script started on Wed Oct 28 09:38:38 2009
> # zfs get dedup rpool/export/home
> NAME PROPERTY VALUE SOURCE
> rpool/export/home dedup on local
> # for i in 1 2 3 4 5 ; do mkdir /export/home/d${i} && df -k
> /export/home/d${i} && zfs get used rpool/export/home && cp /testfile
> /export/home/d${i}; done
> Filesystem kbytes used avail capacity Mounted on
> rpool/export/home 17418240 27 6063425 1% /export/home
> NAME PROPERTY VALUE SOURCE
> rpool/export/home used 27K -
> Filesystem kbytes used avail capacity Mounted on
> rpool/export/home 17515512 103523 6057381 2% /export/home
> NAME PROPERTY VALUE SOURCE
> rpool/export/home used 102M -
> Filesystem kbytes used avail capacity Mounted on
> rpool/export/home 17682840 271077 6056843 5% /export/home
> NAME PROPERTY VALUE SOURCE
> rpool/export/home used 268M -
> Filesystem kbytes used avail capacity Mounted on
> rpool/export/home 17852184 442345 6054919 7% /export/home
> NAME PROPERTY VALUE SOURCE
> rpool/export/home used 432M -
> Filesystem kbytes used avail capacity Mounted on
> rpool/export/home 17996580 587996 6053933 9% /export/home
> NAME PROPERTY VALUE SOURCE
> rpool/export/home used 574M -
> # zfs get all rpool/export/home
> NAME PROPERTY VALUE SOURCE
> rpool/export/home type filesystem -
> rpool/export/home creation Mon Sep 21 9:27 2009 -
> rpool/export/home used 731M -
> rpool/export/home available 5.77G -
> rpool/export/home referenced 731M -
> rpool/export/home compressratio 1.00x -
> rpool/export/home mounted yes -
> rpool/export/home quota none default
> rpool/export/home reservation none default
> rpool/export/home recordsize 128K default
> rpool/export/home mountpoint /export/home inherited
> from rpool/export
> rpool/export/home sharenfs off default
> rpool/export/home checksum on default
> rpool/export/home compression off default
> rpool/export/home atime on default
> rpool/export/home devices on default
> rpool/export/home exec on default
> rpool/export/home setuid on default
> rpool/export/home readonly off default
> rpool/export/home zoned off default
> rpool/export/home snapdir hidden default
> rpool/export/home aclmode groupmask default
> rpool/export/home aclinherit restricted default
> rpool/export/home canmount on default
> rpool/export/home shareiscsi off default
> rpool/export/home xattr on default
> rpool/export/home copies 1 default
> rpool/export/home version 4 -
> rpool/export/home utf8only off -
> rpool/export/home normalization none -
> rpool/export/home casesensitivity sensitive -
> rpool/export/home vscan off default
> rpool/export/home nbmand off default
> rpool/export/home sharesmb off default
> rpool/export/home refquota none default
> rpool/export/home refreservation none default
> rpool/export/home primarycache all default
> rpool/export/home secondarycache all default
> rpool/export/home usedbysnapshots 0 -
> rpool/export/home usedbydataset 731M -
> rpool/export/home usedbychildren 0 -
> rpool/export/home usedbyrefreservation 0 -
> rpool/export/home logbias latency default
> rpool/export/home dedup on local
> rpool/export/home mlslabel none default
> # ls -l /export/home/d?
> /export/home/d1:
> total 299237
> -rw-r----- 1 root root 152993234 Oct 28 09:41 testfile
>
> /export/home/d2:
> total 299237
> -rw-r----- 1 root root 152993234 Oct 28 09:41 testfile
>
> /export/home/d3:
> total 299237
> -rw-r----- 1 root root 152993234 Oct 28 09:42 testfile
>
> /export/home/d4:
> total 299237
> -rw-r----- 1 root root 152993234 Oct 28 09:42 testfile
>
> /export/home/d5:
> total 299237
> -rw-r----- 1 root root 152993234 Oct 28 09:42 testfile
> # sync
> # sync
> # zfs get dedup,used rpool/export/home
> NAME PROPERTY VALUE SOURCE
> rpool/export/home dedup on local
> rpool/export/home used 731M -
> #
> script done on Wed Oct 28 09:44:16 2009
>
>
> By the look of it, nothing happens. Is there anything else to do to enable
> the dedup, or I am completely misunderstanding the way it should be working?
>
> Chavdar Ivanov
Hi Chavdar,
as far as I understood it, the dedup works during writing, and won't
deduplicate already written data (this is planned for a later release).
- Thomas
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