Time Machine, Netatalk and Error Code -6602
Over the Christmas break, I set time machine to backup my laptop to a USB drive attached to my Mythbuntu backend server. There are plenty of instructions out there on how to do this. I used this one.
The machine I’m using as the server is old. It doesn’t have onboard USB 2.0 ports, so the backups were really slow. I grabbed a USB 2.0 card to try and speed up the backups. The long and the short of this is that I managed to hit a 2 year old USB mass storage bug.
In my attempt to get around the bug, I tried upgrading the server from Ubuntu 7.10 to 8.10. The upgrade went well, though it didn’t solve my USB problem.
As a side effect of the upgrade, my laptop wasn’t able to mount the backups any longer. I was getting a -6602 error from Finder. Googling for the error message pointed towards Samba connection problems.
The actual problem turned out to be a change in the Berkeley DB library after the upgrade:
Jan 8 19:23:24 mythtv afpd[28202]: CNID DB initialized using Berkeley DB 4.6.21: (September 27, 2007)
Jan 8 19:23:24 mythtv afpd[28202]: cnid_open: dbenv->open (rw) of /backups/gary/.AppleDB failed: DB_VERSION_MISMATCH: Database environment version mismatch
Jan 8 19:23:24 mythtv afpd[28202]: cnid_open: dbenv->open of /backups/gary/.AppleDB failed: DB_VERSION_MISMATCH: Database environment version mismatch
Jan 8 19:23:24 mythtv afpd[28202]: Cannot open CNID db at [/backups/gary].
The final solution was to remove the old .AppleDB directories and restart netatalk.
