Christopher James Halse Rogers wrote: > On Mon, 2009-05-25 at 11:12 +0800, Christopher Chan wrote: > >>> That is not the case with OpenSolaris based ZFS root capable >>> installations. While the whole disk maybe taken up by a zfs pool, the >>> installation will create three at least zfs filesystems. ROOT/, >>> ROOT/opt, export, and export/home all exist on my OpenSolaris >>> installation. So all data is stored in the user's home directory is not >>> at all affected by upgrades or downgrades. >>> >>> >>> >> ...I need more sleep and to get out of Hong Kong...my command of English >> has gone down the drain. >> >> Allow me to retype that: >> >> That is not the case with OpenSolaris based ZFS root capable >> installations. While the whole disk maybe taken up by a zfs pool, the >> installation will create at least three zfs filesystems. ROOT/, >> ROOT/opt, export, and export/home all exist on my OpenSolaris >> installation. So all data is stored in the user's home directory and is not >> at all affected by upgrades or downgrades. >> >> > So, what happens when, say, I upgrade to a new version of Evolution and > it decides to convert all its existing mailboxes to the new database > format on first run, and I later want to revert because of new bugs? It > doesn't matter that I can roll back everything but /home to the previous > Evolution version - that mail is now essentially gone as far as the old > Evolution is concerned. > Heh. Like they say: BACKUP BEFORE YOU UPGRADE. So I could have simply made a snapshot of export/home and then upgraded if I was worried about the new packages messing up my data.
So /export/home is covered too although that is not part of the process of upgrading. If one did not read the release notes and what not...well...tough eh? > Alternatively, replace Evolution with MySQL or such. > > This is what I understand to be the hard problem in *supporting* package > downgrades. > > > Ah, but this is no longer 'roll back' relevant. No fancy zapped file system will help there. -- Ubuntu-devel-discuss mailing list Ubuntu-devel-discuss@lists.ubuntu.com Modify settings or unsubscribe at: https://lists.ubuntu.com/mailman/listinfo/ubuntu-devel-discuss
