Components in the rear of the enclosure
This topic describes the hardware components in the rear of the enclosure. The rear view of the Storwize® V3700 enclosure is the same whether the enclosure has 12 or 24 drive slots.
Two canisters and two power supplies are located in each enclosure. For Storwize V3700 control enclosure, node canisters are used. In Storwize V3700 expansion enclosures, expansion canisters are used.
Node canisters might have an optional host interface adapter installed.
Figure 1 shows the rear view of a control enclosure and identifies the location of the power supply units and node canisters.
Figure 1. Rear view of Storwize V3700 control
enclosure

- 1 Node canisters
- 2 Power supply units
Note: Figure 1 shows the node
canisters in their initial configuration, with no host interface adapter options
installed.
Note: Figure 1 shows an enclosure that is equipped with alternating
current (ac) power supplies. Some enclosure models have direct current (DC) power supplies instead
(see Reviewing your packing slip for the model numbers).
For more information about dc power supply units, see Direct current power supply units.