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52 DS8000 Series: Concepts and Architecture
RIO-G interconnect separation
Figure 3-4 on page 51 depicts that the RIO-G interconnection is also split between the two
storage facility images. The RIO-G interconnection is divided into 2 loops. Each RIO-G loop is
dedicated to a given storage facility image. All I/O enclosures on the RIO-G loop with the
associated host adapters and drive adapters are dedicated to the storage facility image that
owns the RIO-G loop.
As a result of the strict separation of the two images, the following configuration options exist:
Each storage facility image is assigned to one dedicated RIO-G loop; if an image is offline,
its RIO-G loop is not available.
All I/O enclosures on a given RIO-G loop are dedicated to the image that owns the RIO-G
loop.
Host adapter and device adapters on a given loop are dedicated to the associated image
that owns this RIO-G loop.
Disk enclosures and storage devices behind a given device adapter pair are dedicated to
the image that owns the RIO-G loop.
Configuring of capacity to an image is managed through the placement of disk enclosures
on a specific DA pair dedicated to this image.
3.2.4 DS8300 Model 9A2 configuration options
In this section we explain which configuration options are available for the DS8300 Model
9A2.
The Model 9A2 (base frame) has:
32 to 128 DDMs
– Up to 64 DDMs per storage facility image, in increments of 16 DDMs
System memory
– 32, 64, 128, 256 GB (half of the amount of memory is assigned to each storage facility
image)
Four I/O bays
– Two bays assigned to storage facility image 1 and two bays assigned to storage facility
image 2
– Each bay contains:
• Up to 4 host adapters
• Up to 2 device adapters
S-HMC, keyboard/display, and 2 Ethernet switches
The first Model 9AE (expansion frame) has:
An additional four I/O bays
Two bays are assigned to storage facility image 1 and two bays are assigned to storage
facility image 2.
Each bay contains:
– Up to 4 host adapters
– Up to 2 device adapters