Le 23 oct. 09 à 08:46, Stathis Kamperis a écrit :
2009/10/23 michael schuster <michael.schus...@sun.com>:Stathis Kamperis wrote:Salute. I have a filesystem where I store various source repositories (cvs +git). I have compression enabled on and zfs get compressratio reports1.46x. When I copy all the stuff to another filesystem without compression, the data take up _less_ space (3.5GB vs 2.5GB). How's that possible ?just a few thoughts: - how do you measure how much space your data consumes?With zfs list, under the 'USED' column. du(1) gives the same results as well (the individual fs sizes aren't enterily identical with those that zfs list reports , but the difference still exists). tank/sources 3.73G 620G 3.73G /export/sources <--- compressed tank/test 2.32G 620G 2.32G /tank/test <--- uncompressed
USED includes the size of the children and the size of the snapshot. I see below that you don't have snapshots on that pull, but in general, I found more useful to use
zfs list -o space,compress,ratio to look at how the space is used.
- how do you copy?With cp(1). Should I be using zfs send | zfs receive ?
zfs send/receive or rsync -aH may do a better job by preserving hard links.
Regards, Gaëtan -- Gaëtan Lehmann Biologie du Développement et de la Reproduction INRA de Jouy-en-Josas (France) tel: +33 1 34 65 29 66 fax: 01 34 65 29 09 http://voxel.jouy.inra.fr http://www.itk.org http://www.mandriva.org http://www.bepo.fr
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