Comment 15 for bug 1316583

After an additional investigation I found that sometimes Astute can't reboot node using SysReq over SSH:

http://paste.openstack.org/show/81629/

but previous task (erase_nodes) finished successfuly:

http://paste.openstack.org/show/81638/

and I can access it manually from master node without problems. You can find full logs in attachemnts.

Also, I added the following steps to ssh_erase_nodes.rb to avoid the situation when node filesystem corruption occurs on system drive and node really can't be accessed via SSH due to input/output error:

1. Found all known partitions with filesystems and set them to cause panic in case of errors
2. Remove MBR (including partition table) only and don't destroy filesystems in case of GRUB isn't installed there
3. Flush filesytem buffers before exiting