Shutdown a MSA2000 on powerfailure

Hello,

i am working on the emergency procedures of my company's server room and i am wondering how to proper shutdown the HP MSA2000 which is connected via fiber to our two ESX 4.0 hosts.

Reguarding the two ESX hosts everything works fine: the UPS' software agents detect the power failure and gracefull shutdown them, but what about the HP MSA2000?

Googling around didn't help me as weel as the HP's documentation.

My (not working) solution at the moment is: on the vcenter host  the ups' software agent executes a script that checks if the two ESX host are poweroff and then tries to shutdown the MSA2000 via SSH. The problem is about the MSA2000 that seems to do not accept the "shutdown both" command via SSH (like any other command).

I am using plink.exe to perform the SSH connection (it works) and execute the command (it doesn't work).

Any help is appreciated.

Thanks

(Sorry for my english)