[sheepdog] effective storing backups and deduplication

[Vasiliy Tolstov]

2015-02-11 15:28 GMT+03:00 Liu Yuan <namei.unix at gmail.com>:
> We need to what is user's backups. Is it the whole vdi or dalta data for
> different vdis?


Best scheme as i think is:
1) If backup not exists for vdi - create full backup (this is simple
copy all data)
2) If backup already created - create new backup and copy only delta
from previous backup.
3) If use delete old backup - remove garbage pieces that not belongs
to other vdi.
4) In case of steps from 1 to 2 - check other vdi pieces for duplicate
data and store only difference. But i think this is very problematic
in this case.

-- 
Vasiliy Tolstov,
e-mail: v.tolstov at selfip.ru
jabber: vase at selfip.ru