Many Thanks for your advices, they all point to investigate a hardware problem or driver problem;
I'll do some testing, and I'll buy an LSI disk controller card for the little HP ML310.
The old SUN machine has an LSI Controller;
Until 3 Month ago I had a very satifying Installation Sun X4150 / Solaris 10 / ZFS .
Then I updated to the last Version of Solaris 10 and since then I experience sudden reboots from time to time.
I have very little experience in Solaris, the only reason why I ran this OS was ZFS.
Now I...