Ocfs2 users - Jan 2021 - how to find out the real size of a reflink ?

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



-- 

Bernd Lentes 
Head of Systemadministration 
Institute for Metabolism and Cell Death (MCD) 
Building 25 - office 122 
HelmholtzZentrum M?nchen 
bernd.lentes at helmholtz-muenchen.de 
phone: +49 89 3187 1241 
phone: +49 89 3187 3827 
fax: +49 89 3187 2294 
http://www.helmholtz-muenchen.de/mcd
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

Hi Bernd,

See if any of the info here helps:

https://unix.stackexchange.com/questions/263309/how-to-verify-a-file-copy-is-reflink-cow/

Thanks,
Herbert.

> On Jan 11, 2021, at 6:42 AM, Lentes, Bernd <bernd.lentes at
helmholtz-muenchen.de> 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
> 
> 
> 
> -- 
> 
> Bernd Lentes 
> Head of Systemadministration 
> Institute for Metabolism and Cell Death (MCD) 
> Building 25 - office 122 
> HelmholtzZentrum M?nchen 
> bernd.lentes at helmholtz-muenchen.de 
> phone: +49 89 3187 1241 
> phone: +49 89 3187 3827 
> fax: +49 89 3187 2294 
> http://www.helmholtz-muenchen.de/mcd
> 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
> 
> 
> _______________________________________________
> Ocfs2-users mailing list
> Ocfs2-users at oss.oracle.com
> https://oss.oracle.com/mailman/listinfo/ocfs2-users

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
> 
> 
>