Darren J Moffat wrote: > [EMAIL PROTECTED] wrote: > >>> As others have noted, the COW nature of ZFS means that there is a >>> good chance that on a mostly-empty pool, previous data is still intact >>> long after you might think it is gone. A utility to recover such data is >>> (IMHO) more likely to be in the category of forensic analysis than >>> a mount (import) process. There is more than enough information >>> publically available for someone to build such a tool (hint, hint :-) >>> -- richard >>> >> Veritas, the makers if vxfs, whom I consider ZFS to be trying to >> compete against has higher level (normal) support engineers that have >> access to tools that let them scan the disk for inodes and other filesystem >> fragments and recover. When you log a support call on a faulty filesystem >> (in one such case I was involved in zeroed out 100mb of the first portion >> of the volume killing off both top OLT's -- bad bad) they can actually help >> you at a very low level dig data out of the filesystem or even recover from >> pretty nasty issues. They can scan for inodes (marked by a magic number), >> have utilities to pull out files from those inodes (including indirect >> blocks/extents). Given the tools and help from their support I was able to >> pull back 500 gb of files (99%) from a filesystem that emc killed during a >> botched powerpath upgrade. Can Sun's support engineers, or is their >> answer pull from tape? (hint, hint ;-) >> > > Sounds like a good topic for here: > > http://opensolaris.org/os/project/forensics/ > I took a look at this project, specifically http://opensolaris.org/os/project/forensics/ZFS-Forensics/. Is there any reason that the paper and slides I presented at the OpenSolaris Developers Conference on zfs on-disk format not mentioned? The paper is at: http://www.osdevcon.org/2008/files/osdevcon2008-proceedings.pdf starting on page 36, and the slides are at: http://www.osdevcon.org/2008/files/osdevcon2008-max.pdf
thanks, max _______________________________________________ zfs-discuss mailing list zfs-discuss@opensolaris.org http://mail.opensolaris.org/mailman/listinfo/zfs-discuss
