Thanks to Eric, Jerry, Madison and all who replied.

It turns out that, just as with 9.30 and 9.40 FC1 and 2 with this client, we
have discovered through our testing a problem already known to IBM, viz:

165122 REVERSION FROM 9.4 SHOULD FINISH WITH APPROPRIATE (PRE94) CHECKPOINT
LOG RECORD.

There's no workaround. The problem will be fixed in 9.40 FC4, currently
scheduled for mid-May 2004.

As the absence of a reversion path is a complete show-stopper for the
end-user, I don't think they're going to be very happy ....

cheers
Neil

"Neil Truby" <neil.truby@ardenta.com> wrote in message
news:btjhun$7r28c$1@ID-162943.news.uni-berlin.de...
> HP-UX 11.11
> IDS 9.20 FC4 to IDS 9.40 FC2
>
> We are testing the above upgrade. On three of the four databases to be
> converted we have had no problems in the conversion process (we did
> encounter a bug with slow index builds, a known problem kindly identified
by
> Jonathan Leffler due to be fixed in 9.40 FC3). On the fourth, it also
> converts OK but sporadically - perhaps 2 times in 10 - the reversion back
> from 9.40 (level 0) to 9.21 will fail. This is an *absolute* show-stopper
> for this client. The database in question is mission-critical, and is
> 500GBytes in size, so dbexport/dbimport, or a restore, is not viable.
>
> A call has been raised with Tech Support (389466). Because this is not a
> "down" system we will have to work hard to ensure that it receives a
> prioroty that refelects the imprtance of the issue to the client.
>
> Any insight gratefully received. I attach the online log from the
reversion
> process and the subsequent attempt to bring the server back online.
>
> thanks
> Neil Truby t:01932 724027
> Director m:07798 811708
> Ardenta Limited e:neil.truby@ardenta.com