2009/11/27 Thomas Maier-Komor <tho...@maier-komor.de>:
> 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).
I understand the same; the last command of the for line in the example
above is actual copying of /testfile to five separate directories
within a ZFS which has dedup=on; as the deduplication is synchronous,
I thought I should be able to see on the fly the disk usage as
expressed by 'df -k' and the ZFS 'used' attribute stay the same.
>
> - Thomas
>
Chavdar
--
----
Jonathan Swift - "May you live every day of your life." -
http://www.brainyquote.com/quotes/authors/j/jonathan_swift.html
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