Hi Lentes, you can use "o2info --filestat yourfile" to identify how many data clusters for a cloned file are shared with the original file. Of course, the cloned file does not share meta-data blocks with the original file, only shares the data clusters. e.g. ghe-nd1:/rear/test # o2info --filestat dd.1.ref File: dd.1.ref Size: 8589934592 Blocks: 16777216 IO Block: 4096 regular file Device: fe00h/65024d Inode: 355844 Links: 1 Frag%: 0.01 Clusters: 2097152 Extents: 157 Score: 2 Shared: 2097152 Unwritten: 0 Holes: 0 Xattr: 0 Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2021-01-13 10:08:06.561968304 +0800 Modify: 2021-01-13 10:07:52.74642661 Change: 2021-01-13 10:07:52.77958163 Please refer to "Shared: 2097152" item. Thanks Gang On 2021/1/11 22:42, Lentes, Bernd wrote:> Hi guys, > > is there a way to find out the real size of a reflink ? > "ls -s" doesn't seem to help. > And shared-du or shared-filefrag does not seem to be available for my SLES 12 SP5. > I know that i can calculate using df -h, but that's not convenient. > > Thanks. > > Bernd > > >
Hi Lentes, you can use "o2info --filestat yourfile" to identify how many data clusters for a cloned file are shared with the original file. Of course, the cloned file does not share meta-data blocks with the original file, only shares the data clusters. e.g. ghe-nd1:/rear/test # o2info --filestat dd.1.ref File: dd.1.ref Size: 8589934592 Blocks: 16777216 IO Block: 4096 regular file Device: fe00h/65024d Inode: 355844 Links: 1 Frag%: 0.01 Clusters: 2097152 Extents: 157 Score: 2 Shared: 2097152 Unwritten: 0 Holes: 0 Xattr: 0 Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2021-01-13 10:08:06.561968304 +0800 Modify: 2021-01-13 10:07:52.74642661 Change: 2021-01-13 10:07:52.77958163 Please refer to "Shared: 2097152" item. Thanks Gang On 2021/1/11 22:42, Lentes, Bernd wrote:> Hi guys, > > is there a way to find out the real size of a reflink ? > "ls -s" doesn't seem to help. > And shared-du or shared-filefrag does not seem to be available for my SLES 12 SP5. > I know that i can calculate using df -h, but that's not convenient. > > Thanks. > > Bernd > > >
Lentes, Bernd
2021-Jan-13 13:58 UTC
[Ocfs2-users] how to find out the real size of a reflink ?
----- On Jan 13, 2021, at 3:42 AM, Gang He ghe at suse.com wrote:> Hi Lentes, > > you can use "o2info --filestat yourfile" to identify how many data > clusters for a cloned file are shared with the original file. > Of course, the cloned file does not share meta-data blocks with the > original file, only shares the data clusters. > e.g. > ghe-nd1:/rear/test # o2info --filestat dd.1.ref > File: dd.1.ref > Size: 8589934592 Blocks: 16777216 IO Block: 4096 regular file > Device: fe00h/65024d Inode: 355844 Links: 1 > Frag%: 0.01 Clusters: 2097152 Extents: 157 Score: 2 > Shared: 2097152 Unwritten: 0 Holes: 0 Xattr: 0 > Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) > Access: 2021-01-13 10:08:06.561968304 +0800 > Modify: 2021-01-13 10:07:52.74642661 > Change: 2021-01-13 10:07:52.77958163 > > Please refer to "Shared: 2097152" item. >Hi Gang, thanks for your information. i did it: ha-idg-1:/mnt/ocfs2 # o2info --filestat reflink/vm_amok.raw File: reflink/vm_amok.raw Size: 880469343744 Blocks: 1719666688 IO Block: 4096 regular file Device: fe13h/65043d Inode: 583953 Links: 1 Frag%: 6.60 Clusters: 839681 Extents: 55431 Score: 7 Shared: 839681 Unwritten: 0 Holes: 0 Xattr: 0 Access: (0644/-rw-r--r--) Uid: ( 0/ root) Gid: ( 0/ root) Access: 2021-01-12 23:18:07.920405221 +0100 Modify: 2021-01-12 22:40:07.806758460 +0100 Change: 2021-01-12 22:40:08.404660948 +0100 ha-idg-1:/mnt/ocfs2 # ha-idg-1:/mnt/ocfs2 # o2info --filestat vm_amok.raw File: vm_amok.raw Size: 880469343744 Blocks: 1719666688 IO Block: 4096 regular file Device: fe13h/65043d Inode: 8257821 Links: 1 Frag%: 6.60 Clusters: 839681 Extents: 55421 Score: 7 Shared: 836667 Unwritten: 0 Holes: 0 Xattr: 0 Access: (0644/-rw-r--r--) Uid: ( 488/srvGeoClue) Gid: ( 487/ ntp) Access: 2021-01-13 14:29:43.496432144 +0100 Modify: 2021-01-13 14:48:02.745794317 +0100 Change: 2021-01-13 14:48:02.745794317 +0100 Some questions: What is a cluster ? What is an extent ? Shouldn't the number of the shared clusters be the same for both files ? During runtime, the number of shared clusters for the reflink stays the same, for the original file it's reducing. Is that expected behaviour ? Bernd Helmholtz Zentrum M?nchen Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: MinDir.in Prof. Dr. Veronika von Messling Geschaeftsfuehrung: Prof. Dr. med. Dr. h.c. Matthias Tschoep, Kerstin Guenther Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671