v SAN Volume Controller 2145-8F4
v SAN Volume Controller 2145-8F2
v SAN Volume Controller 2145-4F2
SAN fabric overview
The SAN fabric is an area of the network that contains routers, gateways, hubs,
and switches. A single cluster SAN contains two distinct types of zones: a host
zone and a disk zone.
In the host zone, the host systems can identify and address the SAN Volume
Controller nodes. You can have more than one host zone. Generally, you create one
host zone for each host type. In the disk zone, the SAN Volume Controller nodes
identify the disk drives. Host systems cannot operate on the disk drives directly;
all data transfer occurs through the SAN Volume Controller nodes. Figure 1 shows
several host systems that are connected in a SAN fabric.
A cluster of SAN Volume Controller nodes is connected to the same fabric and
presents virtual disks (VDisks) to the host systems. You create these VDisks from
units of space within a managed disk (MDisk) group. An MDisk group is a
collection of MDisks that are presented by the storage subsystems (RAID
controllers). The MDisk group provides a storage pool. You specify how each
group is created, and you can combine MDisks from different manufacturers’
controllers in the same MDisk group.
Note: Some operating systems cannot tolerate other operating systems in the same
host zone, although you might have more than one host type in the SAN
Fibre Channel
Fabric
Host Host Host Host
.
.
.
RAID RAID RAID RAID
...
Host zone
Disk zone
Node 1
Node 2
Node 3
Figure 1. Example of a SAN Volume Controller cluster in a fabric
4 IBM System Storage SAN Volume Controller: Hardware Installation Guide
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