Apple Xsan 1.x - Manual (Page 35)

Chapter 3 Deployment Examples 35
To handle more than 64 devices, you can set up some of the processors to act as “head
nodes” that are connected to the SAN and reshare the SAN data with the other
processors over Ethernet.
Volume Configuration
In this example, input data and output data are stored on separate volumes to increase
performance. For data protection, however, we use 6-drive arrays with a hot spare in
each array.
Fibre
Channel switch
Head
nodes
Computational
nodes
Standby
controller
Metadata
controller
Ethernet - TCP/IP
Xserve RAID
storage
1
3 4
5 6
2
2-disk RAID 1 1
2-disk RAID 1 2
6-disk RAID 5 3
6-disk RAID 5 4
6-disk RAID 5 5
6-disk RAID 5 6
Out data pool for results volume
Metadata pool for source volume
In data pool for source volume
Metadata pool for results volume