OK, thanks anyone for their most useful answers. Indeed, raidctl -R worked. I did scsictl stop/detach/scan, despite, strictly speaking, it shouldn't have been necessary.
Now I have yet to find out why an identical disc was only scanned as 160MB/s, where the original one was 320. In fact, repeated scsictl scan make it either 80 or 160MB. Is there way to re-negotiate sync speed?
