So, reinstall the whole stuff from scratch. Yes, and not once, but still with the same failure result when trying to enable logical RAID5 drives. Chill out guys, I’m not going to tell the whole story from the very beginning, though there were quite a few rakes that I’ve luckily avoided during my first install, but did not miss later on. Just the solution. Turned out to be not soft but hard related. One of the physical SCSI hard drives failed. Took some efforts to figure out which of twelve. So, finally I have ended up removing two and replacing one. Besides I’ve changed NetRAID configuration to 1xRAID1 and 1xRAID5 logical drives. After this I did the base system installation already by heart. As to the final system, I’ve done it a little bit different. Instead of installing prepackaged Apache+MySQL+PHP+GD bundle, I got the latest releases of each and did three steps configure – make – make install for each. A bit time consuming and no automatic updates. But it will serve for awhile.
Seems as if that’s the end. Unless I recall something worth telling