@jmo: I have the exact same problem... only in reverse.
When upgrading to OS X 10.5 (from 10.4) we got problems with locking. At first I thought this was a OS X issue, but after upgrading the DSS to 5.0 DB47 build 3216 all of a sudden it worked.
Yesterday I had to take the system down completely to change a 10GbE cable and when it came up again the locking issue was back.
I'll try to do a proper cold-start as soon as I can to see if I can restore the lock-functionality again.
It is a bit scary if the locking feature is random depending on your luck since we have the home directory of both mac's and a bunch of linux workstations mounted from the dss.
we have the same problems on or SOLARIS mounted DSS. As there are some users already waiting to go back to work, I would like to ask: Do you already know when an update will be available ?
@Koroljow:
As I understood it they are working on a fix, but they can't promise when it will be ready. We too have several systems, both servers and workstations, that we can't use because of this issue and if it's not fixed soon we have to consider some other distro instead of DSS.
@Koroljow: Ubuntu server 8.04 will probably do the trick for us. It supports our 3ware 9650SE-16ML card as well as all the network cards in the system. If that doesn't work as expected I'll probably go back to my favorite server-distro gentoo even though that one takes a bit more time to set up.
@atle: I have just received an update iso (in engineering state) for this problem from OPEN-E Munic. It seems that the official patch will be out something in between 2 weeks and 2 months. Have you tried to phone them, also ?