Hi Alex, Using borg would indeed make sense to copy the replicate the rbd content in case rbd-mirror is not an option, nice idea :-) Interestingly there is no need for a proper file system: the files are immutable and never deleted. They are indexed by the SHA256 of their content and a map where the key is the SHA256 and the value is the offset,size in the rbd image would be enough. Cheers On 01/02/2021 03:27, Alex Gorbachev wrote: > Dear Loïc , > > I do not have direct experience with this many files, but it resonates for > me with deduplication, such as borg (https://www.borgbackup.org/) or a > similar implementation in the latest Proxmox Backup Server ( > https://pbs.proxmox.com/wiki/index.php/Main_Page). I think you would need > a filesystem for either, so not sure how well this would integrate directly > with RBD, but maybe cephfs is an option? I typically run zfs on top of > rbd, and use only zfs compression, and then put borg on top of zfs. There > is overhead, but this is a very flexible setup, operationally. All the > best in your endeavor! > -- > Alex Gorbachev > ISS/Storcium > > > > On Sat, Jan 30, 2021 at 10:01 AM Loïc Dachary <loic@xxxxxxxxxxx> wrote: > >> Bonjour, >> >> In the context Software Heritage (a noble mission to preserve all source >> code)[0], artifacts have an average size of ~3KB and there are billions of >> them. They never change and are never deleted. To save space it would make >> sense to write them, one after the other, in an every growing RBD volume >> (more than 100TB). An index, located somewhere else, would record the >> offset and size of the artifacts in the volume. >> >> I wonder if someone already implemented this idea with success? And if >> not... does anyone see a reason why it would be a bad idea? >> >> Cheers >> >> [0] https://docs.softwareheritage.org/ >> >> -- >> Loïc Dachary, Artisan Logiciel Libre >> >> >> >> >> >> >> _______________________________________________ >> ceph-users mailing list -- ceph-users@xxxxxxx >> To unsubscribe send an email to ceph-users-leave@xxxxxxx >> > _______________________________________________ > ceph-users mailing list -- ceph-users@xxxxxxx > To unsubscribe send an email to ceph-users-leave@xxxxxxx -- Loïc Dachary, Artisan Logiciel Libre
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