I have noticed that dedup is discussed a lot in this list right now..
Starting to experiment with dedup=on, I feel it would be interesting in
knowing exactly how efficient dedup is. The problem is that I've found
no way of checking this per file system. I have turned dedup on for a
few file systems to try it out:
p...@opensolaris-fs:~$ zfs get all storage/virtualbox|grep dedup
storage/virtualbox dedup on local
p...@opensolaris-fs:~$ zfs get all storage/testshare|grep dedup
storage/testshare dedup on local
zfs list shows a dedup value of 2.22x, mainly because I made a few
copies of my vdi files in the 'virtualbox' file system. For what I
understand, this value represents the dedup efficiency for the whole zpool.
For my 'testshare' file system, the dedup value should be about 6x,
since I just made five copies of a folder with a few hundred files.
The question is: is there any way to check/confirm the level of dedup
efficiency ?
/PeO
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