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Chapter 4. Virtualization concepts 67

Figure 4-1 Physical layer as the base for virtualization

When you compare this with the ESS design, where there was a real loop and having an

8-pack close to a device adapter was an advantage, this is no longer relevant for the DS6000.

Because of the switching design, each drive is in close reach of the device adapter, apart

from a few more hops through the Fibre Channel switches for some drives. So, it is not really

a loop, but a switched FC-AL loop with the FC-AL addressing schema: Arbitrated Loop

Physical Addressing (AL-PA).

4.2.1 Array sites

An array site is a group of four DDMs. What DDMs make up an array site is pre-determined by

the DS6000, but note, that there is no pre-determined server affinity for array sites. The

DDMs selected for an array site are chosen from the same disk enclosure string (see

Figure 4-2 on page 68). All DDMs in an array site are of the same type (capacity and RPM).

Device Adapter

Server0

Server1

Storage enclosure pair

Switched loop 1

Switches

Device Adapter

Switched loop 2

Inter-server communication

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IBM DS6000 Manuale Utente Pagina 91

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