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706 bytes added ,  00:41, 16 December 2012
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# Boot up login to admin panel and add sdb to the array, and wait for raid to fully sync.
 
# Boot up login to admin panel and add sdb to the array, and wait for raid to fully sync.
 
# Reboot with both drives in place, and check RAID health is OK.
 
# Reboot with both drives in place, and check RAID health is OK.
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mdadm --grow /dev/md2 --size=max
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pvresize /dev/md2
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lvresize -l +100%FREE main/root
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ext2online -C0 /dev/main/root 
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In the last command above, the -C0 is: dash C zero
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If you receive an  "command not found" error,  try this:
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resize2fs /dev/mapper/main-root &
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TIP: I put an "&" at end to allow it to run in background even if I close ssh session.
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Notes : 
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* All of this can be done while the server is up and running with the exception of #1.
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* These instructions should work for any raid level you have as long as you have >= 2 drives
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* If you have disabled lvm 
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# you don't need the pvresize or lvresize command
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# the final line becomes ext2online -C0 /dev/md2 (or whatever / is mounted to)

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