Appendix C. Solid State Drives on the IBM System Storage DS5000 series 529
An example of an existing storage environment is shown in Figure C-1. The design results in
a significantly increased cost associated with maintaining and supporting the infrastructure. In
addition to the immediate effect associated with this balance, growth continues at an
increased rate in the higher cost area of Tier 1. Thus, as the growth occurs, the distribution of
data continues to grow in a non-optimal direction unless there is careful planning and
discipline in deployment.
Figure C-1 Tiered Storage: Cost versus performance
Properly balancing these tiers leads to the minimal cost and best performance solution.
Typically, an optimal design keeps the active operational data in Tier 0 and Tier 1 and uses
Tiers 2 and 3 for less active data. An example is shown in Figure C-2. The benefits
associated with a tiered storage approach are simple; it is all cost related. This approach will
save significant cost associated with storage itself, as lower tiered storage is less expensive.
Beyond that, there are the environmental savings, such as energy, footprint, and cooling
reductions.
Figure C-2 Example of a tiered storage pyramid
Tier 2
Medium
Performance
Non-Mission Critical
Tier 3
Low
Performance
Archival/Tape
Tier 1
High
Performance
Mission Critical
Tier 0
Ultra High
Performance
Cost
per
Gigabyte
Performance
Cost versus Performance
Tier 0: Ultra high performance applications
1-3%
15-20%
20-25%
50-60%
Storage Pyramid
Tier 1:
Mission critical, revenue generating apps
Tier 2: Meet QoS for non-mission critical apps
Tier 3: Archives and long term retention
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