I turned off the desktop and removed the power cord to replace the video card. The MediaSonic Probox also powered down. When I plugged in the desktop and turned it on, along with the Probox, the two single drives in the Probox (/data2 and /data3) automatically mounted, but the 2-drive logical volume, /dev/md0 did not mount. When I try to mount it manually I find that it /doesn't exist.
I've gone through this video card swapping several times this week with the LV mounting, either automatically of when I do so manually. Where do I start looking for the reason it's not now seen? Rich
