Does xserve raid support path failover?

I have two questions about the system.
1 Does the Xserve Raid support path failover from the upper to lower controller? Primarily, if you have IO running on a lun that is on the upper controller and the path to that controller is removed, will the IO get shifted to the lower controller? If so, is there a certain configuration setting that must be applied. I
n reading up on Xserve, it appears that they are independent controllers. The user guide states that when a controller module is out of the system (or failed) the drive modules controlled by that card are not active.
2 Is there a way to determine which drive(s) in the system are the spares or stand by?

Hi Davel,
1) No. The controllers are independent. If a RAID controller fails, or a cable fails, or a switch or HBA that a RAID controller is connected to fails, the LUN goes offline until the problem is fixed.
2) Yes. Just look in RAID Admin. Any drive that is not part of a RAID set will automatically be used as a hot spare. So if you have a 6 disk RAID 5, on a side with 7 disks, you have one hot spare. If you have a 5 disk RAID 5, with two drives that aren't used, you have 2 hot spares.
Note, on #2, hot spares are "per side," because again the RAID controllers are independent. So what I most commonly see for additional protection is a 6-disk RAID 5 + 1 hot spare, per side. This gives about 5 TB of usable capacity, on a 7 TB Xserve RAID.

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