I've got a disaster on my hands. A company I just recently began work for has an old JIRA 4.0.1 install running on an old box -- that box's hard drive just crashed on us.
I installed JIRA 5.2.8 with MySQL (old installation also used MySQL) but now I don't know how to import the old data. I doubt the last admin did whatever intelligent backup / export process was required to make this simple, plus the huge version jump.
Eek! Totally agree with that - get a backup before touching anything, and then download a copy of Jira 4.0.1 and get that working with the data first. Jumping versions at this point is a potential disaster, especially if the database has been damaged in any way, as it'll make data repair a LOT harder.
In theory, you should be able to take a 4.0.1 install and point it at the database (after a backup is taken!) and it will sort of work straight away. As soon as you get in, you'll see all sorts of horrid errors, but you should get a dashboard and a menu. Don't worry - the errors are likely to be down to the fact I've just told you to create a Jira without indexing - nip into administration and re-index it. Then run the integrity checker, and finally, plough through ALL the logs for any errors. If you had plugins in the old one, then I'd try to install them before you do any of this...
If the database is unharmed, then in theory, a 5.1 install will simply upgrade it.
But I'm doing that at the moment for a large site (specifically 4.0.2 straight to 5.1.8), and we've run into problems with users, greenhopper mangling fields and a whole host of "custom code"/"plugin works differently" issues (sadly, stepping through intermediate versions has done nothing to help with any of the problems, the upgrade steps are at least conisistent in their brokenness). I wouldn't have even thought about starting it from a potentially broken database as well!
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