Re: Recover Logical Logs (the hard way)

Scott Black wrote: > > I'm running HP-UX 10.20 > Online 7.3 > > We had a vandal come in and physically smash some of our server's disk > drives (before the nightly backup). The root dbspace drive is toast. > However the logical log drive is in good working order. Here's the > question: > > How can I save the logical log information so that when we get back up > and running, and restore from Friday's backup, we will be able to roll > forward the logs? > > Any hair brained scheme will be appreciated. Thanks in advance. If your logs were not being backed up constantly, or at least periodically, I do not see how you can recover beyond the last backed up logfiles, if any. You may be toasted. Can you recreate the missing data? Is there any chance of recovering the reserved pages? Even manually, like from an oncheck dump or a dd off a partially damaged drive? Then you may be able to create a dummy instance that thinks the original log files are valid and is willing to archive them with ontape -a. If you know what to look for it should be possible, though tedius, with a binary editor, to patch up the logfile pages with the original values if you can get some clue as to what they were. You need the dbspace pages (4&5 and any additional pages linked to them if the logspace is not on the first page), the chunk pages (6&7 and any additional pages linked to them if the logspace chunks do not live on the first page), and the log pages. I hope you caught this dude. Art S. Kagel