I ran the IOMeter test from VMKtree against a DroboPro and a Raid 5 3Ware Ar2343 array as well as a LSI i8PRO with a RAID 0. I have four 1TB drives, WD and Seagate, in the RAID 5 array and two 2Tb drives as well as three 1Tb drives and Two 750Gb drive in the Drobo. The LSI array has 3 10k drives in RAID 0.
The Drobo uses 76W at its max and 75W idle. I wasn’t able to get the Drobo to spin down after 15 min but when I manually put it in standby its uses 15W and waits for the iSCSI connection to reconnect (I have to manually reconnect it – I think I broke it when I changed the IP a few weeks ago). The server that has both of the arrays uses about 185W max and around 166W when idle.
Controller: LSI SAS211-8i
Controller: 3Ware 9650SE-4LPML
Raid: Beyond Raid
Size: 7.34TB (16Tb logical)