The following information is from the Apple knowledge base: http://docs.info.apple.com/article.html?artnum=307348
It is important for any SAS-connected Expansion Chassis to be fully booted before booting the RAID Controller.
Correct shutdown order:
- Shutdown RAID Controller
- Shutdown SAS-connected Expansion Chassis
Correct boot order:
- Boot SAS-connected Expansion Chassis
- Boot RAID Controller
Not following this above boot order may result in drives being reported as "Dead" or Offline, even though the drives are actually operative. To resolve this issue, follow the steps described in this article.
