IBM DS8000 manual Storage capacity, Storage system logical partitions LPARs

Storage Hardware Management Console (S-HMC) for the DS8000

The DS8000 offers a new integrated management console. This console is the service and configuration portal for up to eight DS8000s in the future. Initially there will be one management console for one DS8000 storage subsystem. The S-HMC is the focal point for configuration and Copy Services management, which can be done by the integrated keyboard display or remotely via a Web browser.

For more information on all of the internal components see Chapter 2, “Components” on page 19.

1.2.2 Storage capacity

The physical capacity for the DS8000 is purchased via disk drive sets. A disk drive set contains sixteen identical disk drives, which have the same capacity and the same revolution per minute (RPM). Disk drive sets are available in:

￿73 GB (15,000 RPM)

￿146 GB (10,000 RPM)

￿300 GB (10,000 RPM)

For additional flexibility, feature conversions are available to exchange existing disk drive sets when purchasing new disk drive sets with higher capacity, or higher speed disk drives.

In the first frame, there is space for a maximum of 128 disk drive modules (DDMs) and every expansion frame can contain 256 DDMs. Thus there is, at the moment, a maximum limit of 640 DDMs, which in combination with the 300 GB drives gives a maximum capacity of

192 TB.

The DS8000 can be configured as RAID-5, RAID-10, or a combination of both. As a price/performance leader, RAID-5 offers excellent performance for many customer applications, while RAID-10 can offer better performance for selected applications.

Price, performance, and capacity can further be optimized to help meet specific application and business requirements through the intermix of 73 GB (15K RPM), 146 GB (10K RPM) or 300 GB (10K RPM) drives.

Note: Initially the intermixing of DDMs in one frame is not supported. At the present time it is only possible to have an intermix of DDMs between two frames, but this limitation will be removed in the future.

IBM Standby Capacity on Demand offering for the DS8000

Standby Capacity on Demand (Standby CoD) provides standby on-demand storage for the DS8000 and allows you to access the extra storage capacity whenever the need arises. With Standby CoD, IBM installs up to 64 drives (in increments of 16) in your DS8000. At any time, you can logically configure your Standby CoD capacity for use. It is a non-disruptive activity that does not require intervention from IBM. Upon logical configuration, you will be charged for the capacity.

For more information about capacity planning see 9.4, “Capacity planning” on page 174.

1.2.3 Storage system logical partitions (LPARs)

The DS8000 series provides storage system LPARs as a first in the industry. This means that you can run two completely segregated, independent, virtual storage images with differing

Chapter 1. Introduction to the DS8000 series 7