On 08/06/2013 22:58, Roberto Spadim wrote:

check this, maybe could help to improve performace (it's not a raid1
solution, it's a cache solution, in kernel 3.9):

http://kernelnewbies.org/Linux_3.9#head-3dbc54b9324d21f06f55299b0a30d6cb06403529

https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/plain/Documentation/device-mapper/cache.txt?id=c6b4fcbad044e6fffcc75bba160e720eb8d67d17
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Thanks to all for input. I have abandoned the attempt to make this 
configuration work - I hit various error messages (latterly: 'Failed to 
RUN_ARRAY /dev/md0 invalid argument') so I am now running without RAID. 
I will look into the cache solution but more likely I will just rsync 
the SSD to the conventional platter disk at regular intervals. (I also 
run rdiff-backup daily to another machine.)

Dominic
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