During the upgrade from Debian Squeeze to Debian Wheezy you will be warned about the move (on linux-base package) from the cciss driver to the new hpsa: “Some HP Smart Array controllers are now handled by the new ‘hpsa’ driver, rather than the ‘cciss’ driver”.
Welcome hpsa! cciss really sucks!!!

Recently there have been problems with a mysql server (Smart Array P410) which reported the following error messages:

INFO: task mysqld:8009 blocked for more than 120 seconds.
"echo 0 > /proc/sys/kernel/hung_task_timeout_secs" disables this message.


Sometimes the server became very unstable due to this kind of blocks (problem partially solved by moving to the deadline io scheduler).
The problem with mysql blocks was solved by a Debian upgrade (moving to hpsa).

If you use cciss on your servers upgrade to hpsa as soon as possible!
hpsa offers better performance and (good news) it’s stable! 😉