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110 DS8000 Series: Concepts and Architecture
Table 6-2 Comparison of models for capacity
Adding DDMs
A significant benefit of the DS8000 series is the ability to add DDMs without disruption for
maintenance. Even if it is difficult to take time for system maintenance for your system (for
example, if you are operating a 24x7 online system), you don’t need to order larger capacity
in advance to prepare for future growth. You can begin with a small configuration at first, and
grow the capacity on demand without disruption.
Future plan
In addition, the architecture is designed to scale with 300 GB disk technology up to 1 PB.
According to the announcement letter, IBM has issued the following Statement of General
Direction:
Future models in the series are planned to provide customers additional flexibility and
scalability. IBM next plans to provide 8-way processors with corresponding scalability from
the 2-way and 4-way models currently offered. In addition, physical capacity will be scalable
through increased disk drives within a configuration.
6.3.2 Scalability for performance
The DS8000 series also has linear scalability for performance. This capability is due to the
architecture of the DS8000 series.
2-way (Base
frame only)
2-way +
Expansion
frame
4-way or LPAR
(Base frame
only)
4-way or LPAR
+ Expansion
frame
4-way or LPAR
+ 2 Expansion
frames
Device adapters 2 to 8
(1 - 4 Fibre Loops)
2 to 8 2 to 8 2 to 16 2 to 16
Drives
73 GB (15k RPM)
146 GB (10k RPM)
300 GB (10k RPM)
16 to 128
(increments of 16)
16 to 384
(increments
of 16)
16 to 128
(increments
of 16)
16 to 384
(increments
of 16)
16 to 640
(increments
of 16)
Physical capacity 1.1 to 37.2 TB 1.1 to 111.6 TB 1.1 to 37.2 TB 1.1 to 111.6 TB 1.1 to 186.3 TB
Note: According to the announcement letter, the following activities are disruptive in the
current status:
Field attachment of a Model 92E with the 922
Field attachment of a Model 9AE with the 9A2
In both cases,
only when the first expansion frame is attached to the base frame, you do
need a disruptive maintenance. The first expansion enclosure for the Model 922 and 9A2
has I/O enclosures and these I/O enclosures must be connected into the current RIO-G
loops. Currently, this operation is not supported non-disruptively.
If you install the base frame and the first expansion frame for the Model 922 or 9A2 at the
beginning, you don’t need a disruptive upgrade to add DDMs. The expansion enclosure for
the DS8100 and the second expansion enclosure for the DS8300 has no I/O enclosure,
therefore you can attach them to the existing frame without disruption.