Am 24.11.2012 um 01:04 schrieb Wido den Hollander <wido@xxxxxxxxx>: > > > On 11/23/2012 05:59 AM, Sage Weil wrote: >> On Thu, 22 Nov 2012, Stefan Priebe - Profihost AG wrote: >>> Hello list, >>> >>> right now a rbd export exports exactly the size of the disk even if there is >>> KNOWN free space. Is this inteded to change? >>> >>> Might it be possible to export just differences between snapshots and merge >>> them later? >> >> We were just talking about this the other day. >> >> Step 1 is to create a mechanism to output a list of block ranges that >> have/have not changed between snapshots. >> >> Step 2 is to export the incremental changes. The hangup there is figuring >> out a generic and portable file format to represent those incremental >> changes; we'd rather not invent something ourselves that is ceph-specific. >> Suggestions welcome! > > I'm not sure about the licensing and such, but doesn't VMware do something with their VMDK images? > > There you have a base image and each snapshot is a separate file. > > You have: > > image.vmdk > image-delta1.vmdk > image-delta2.vmdk > .. > .. > > You can merge all these files together again to a new image based on the last snapshot you feeded it. > > They probably didn't use a open format to do this, but something in that direction is what you are looking for? Yes something like that would be perfect. Stefan > > Wido > >> sage >> >> -- >> To unsubscribe from this list: send the line "unsubscribe ceph-devel" in >> the body of a message to majordomo@xxxxxxxxxxxxxxx >> More majordomo info at http://vger.kernel.org/majordomo-info.html >> -- To unsubscribe from this list: send the line "unsubscribe ceph-devel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
