Read Hat on intel (xSeries), db2 V8.1 fixpack 4, after fixpack released and applied the database was not stoped (when was fixpack 4 released, a year ago, more or less?)
I just don't remember what was before fixpack 4, it was too far ago.
This month I expect upgrade to fixpack 6.
The database is not so big, about 60 GB. It's a tipical OLTP with just a few big queries for reports.
Would be nice to get more RAM (it has 512MB only), but it's difficult to prove to financial management what for we need to buy it if the server works well.
RH upgraded the same time as fixpack applied, it means it was not upgraded since fixpack 4 released.