Ocfs2 users - Jan 2021 - is it possible to have several reflinks of one file ?

On Jan 15, 2021, at 6:00 AM, Lentes, Bernd <bernd.lentes at
helmholtz-muenchen.de> wrote:
> 
> Hi,
> 
> is it possible to have several reflinks of one file ?
> I'd like to create each day one reflink, for one week, thens start to
overwrite them from day to day, so that i never have more than 7 reflinks of the
file.
> Is that possible ?
Absolutely. Not sure what you mean by overwriting them. If you?re doing this to
get a daily snapshot of your data and only keep the last 7, then you can simply
delete the earliest one when you create the next one. The reflinked blocks on
disk will remain because they?re still referenced by the other 7 reflinks.

Thanks,
Herbert.
> 
> 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
> 
> 
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----- On Jan 15, 2021, at 6:47 PM, herbert van den bergh HERBERT.VAN.DEN.BERGH
at ORACLE.COM wrote:
> On Jan 15, 2021, at 6:00 AM, Lentes, Bernd <bernd.lentes at
helmholtz-muenchen.de>
> wrote:
>> 
>> Hi,
>> 
>> is it possible to have several reflinks of one file ?
>> I'd like to create each day one reflink, for one week, thens start
to overwrite
>> them from day to day, so that i never have more than 7 reflinks of the
file.
>> Is that possible ?
> 
> Absolutely. Not sure what you mean by overwriting them. If you?re doing
this to
> get a daily snapshot of your data and only keep the last 7, then you can
simply
> delete the earliest one when you create the next one. The reflinked blocks
on
> disk will remain because they?re still referenced by the other 7 reflinks.
> 
> Thanks,
> Herbert.
> 
Hi Herbert,

how do i delete the old ones ? Just with rm or do i have to use unlink ?

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