You have several drives with errors, not just the one you are trying to clear... and it looks like you are running out of memory too.
Are you running any add-on packages? (other than the pre-clear) The user-share file system is constantly reporting it cannot allocate memory.
How much RAM are you running?
I can't go into detail now... Perhaps RobJ can take a look and provide his input. Perhaps send him a PM and ask him to take a look.
I have 2 GB RAM in the box:
(from /usr/bin/top -b -n1)
top - 01:15:04 up 1:13, 0 users, load average: 3.94, 4.00, 3.73
Tasks: 73 total, 2 running, 71 sleeping, 0 stopped, 0 zombie
Cpu(s): 7.8%us, 60.5%sy, 0.0%ni, 22.3%id, 5.0%wa, 0.6%hi, 3.7%si, 0.0%st
Mem: 1943344k total, 1617648k used, 325696k free, 39868k buffers
Swap: 0k total, 0k used, 0k free, 1481180k cached
(Did a reboot after I saw those kernel things in syslog - never had that before, just during this specific preclear)
Addons: I have disabled cachedirs to keep memory free while moving data to the box. Here is the goscript:
# Start the Management Utility
cd /boot/packages && find . -name '*.auto_install' -type f -print | sort | xargs -n1 sh -c
# Unraid_Notify (E-Mail Notification)
# enable wakeup
/usr/sbin/ethtool -s eth0 wol g
# Start UnMenu
I have to say that I was moving constantly data to the box while clearing the disk - maybe the problems with the disk has blocked the copy process?
Do I need to upgrade the RAM to 4 GB?