Processor And Memory Allocation; Rio-G Interconnect Separation - IBM DS8000 User Manual

Processor and memory allocation

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RIO-G interconnect separation

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DS8000 User's Guide
mirrored across the two physical disk drives for each LPAR. For the DS8300 Model
9A2/9B2, there are four drives in one physical processor complex.
In the DS8300 Model 9A2/9B2 each processor complex has four processors and up
to 128 GB memory capacity. There is also a default 50/50 percent split for
processor and memory allocation. The split can be re-configured with variable
LPAR implementation. See "Variable logical partition implementation" on page 98
for more information. Therefore, every LPAR has two processors and every storage
image has four processors.
The memory limit depends on the total amount of available memory in the whole
system. The following memory allocations per storage image are available:
v 32 GB (16 GB per processor complex, 16 GB per storage image)
v 64 GB (32 GB per processor complex, 32 GB per storage image)
v 128 GB (64 GB per processor complex, 64 GB per storage image)
v 256 GB (128 GB per processor complex, 128 GB per storage image)
Each RIO-G loop is dedicated to a given storage image. All I/O enclosures on the
RIO-G loop with the associated host adapters and drive adapters are dedicated to
the storage image that owns the RIO-G loop.
As a result of the strict separation of the two images, the following configuration
exists:
v Each storage image is assigned to one dedicated RIO-G loop; if an image is
offline, its RIO-G loop is not available.
v All I/O enclosures on a given RIO-G loop are dedicated to the image that owns
the RIO-G loop.
v Host adapter and device adapters on a given loop are dedicated to the
associated image that owns this RIO-G loop.
v Storage enclosures and storage devices behind a given device adapter pair are
dedicated to the image that owns the RIO-G loop.
v Configuring capacity to an image is managed through the placement of storage
enclosures on a specific DA pair that is dedicated to this image.