Re: Have you considered using the "multiple data files" mode of par2?
"edgar.soldin--- via Duplicity-talk" <[email protected]>
| Newsgroups | gmane.comp.sysutils.backup.duplicity.general |
|---|---|
| Message-ID | <[email protected]> |
hey Jacob, i'm sure par2-backend only uses the one parity file tat is put on the backend. what are you hinting at? sunny regards ..ede On 07.10.2024 15:22, Jakob Bohm via Duplicity-talk wrote: > Dear Duplicity backup format designer, > > According to the par2 man page (at least on Debian 12), the par2 command > has two distinct operating modes. One mode creates one or more small > parity files for a single data file stored on an imperfect medium or > service. The other, processes a group of N data files (such as > Duplicity volumes) to produce a few shared parity files. This second > mode is described in the man page under the subheading "CREATING PAR2 > FILES FOR MULTIPLE DATA FILES" . > > Switching to the "multiple data files" mode constitutes a change in > the backup format and thus needs to be guarded with appropriate > compatibility logic in order to restore backups made with either > method, even from damaged storage (where par2 files are actually > needed) . To keep a desired robustness level and a manageable temp > volume size on the client, it is probably necessary to set an internal > limit on the number of volumes for each par2 run . For example if > that limit is 99, the temp volume needs to store about 100 times the > volume size even if not pipelining the creation of later volumes in > parallel with par2 processing and upload. > > Enjoy > > Jakob _______________________________________________ Duplicity-talk mailing list [email protected] https://lists.nongnu.org/mailman/listinfo/duplicity-talk