Quote Originally Posted by setht
So I tried this:

$ sudo modprobe md

...and it just sorta did it. If I understand the man pages correctly, I'm basically telling the kernel "Prepare for a Software RAID." Yes?

$ sudo mdadm --assemble --auto=yes /dev/md0 /dev/hde1 /dev/hdf1 /dev/hdg1 /dev/hdh1

Did this, and it says:

mdadm: device 3 in /dev/md0 has wrong state in superbock, but /dev/hdh1 seems ok
mdadm: failed to RUN_ARRAY /dev/md0: Input/output error

...and, in the interests of not getting in deeper than I can handle, I calmly, humbly and appreciatively await further advice.

Thanks, greenfly!
If I'm reading the error correctly, it seems to be complaining about /dev/hdg1. Since a RAID5 can handle losing a single drive, you can actually rebuild this array in degraded mode. Just replace the partition name with "missing" so if I am correct and /dev/hdg1 is in fact the one with problems, you would type:

Code:
$ sudo mdadm --assemble --auto=yes /dev/md0 /dev/hde1 /dev/hdf1 /dev/hdh1 missing
Then see if the device comes up. If so you should be able to mount it. If not come back here with the error.