Examples of rack locations for SAN Volume Controller 2145-DH8 nodes

The physical hardware is racked with the components associated with the lowest numbered node starting at the bottom of the rack.

Even though the visual representation of the rack that is shown in the management GUI shows top to bottom order, physical order in the rack is bottom to top. In the following graphics, nodes are color-coded to indicate placement. For example, all nodes in green represent odd-numbered nodes and all nodes in red represent even-numbered nodes. Although these examples use a minimum of four nodes within the system installation, the system supports up to eight nodes. Plan space for this maximum number of nodes. If new nodes are added later, space is already allocated which prevents finding space for the new nodes. In addition, for all these examples, a 42-unit high rack is used.

You can install the nodes in the rack without leaving space between them. However, leaving a 1U space below each node, occupied by a 1U faceplate, reduces the risk that a cable that is unexpectedly hanging down from the cable management arm might get damaged by the device below if the node is pulled out on the rails.

Use the following rack examples as guidelines for installing your nodes:

Figure 1 shows a single rack implementation for SAN Volume Controller 2145-DH8 nodes without optional SAN Volume Controller 2145-24F storage attached. Depending upon other existing or planned equipment, the nodes can be installed starting in any location in the rack but must be racked in the groups as shown. Space is reserved at the top of the rack to accommodate data wiring.

Figure 4 shows a single rack of SAN Volume Controller 2145-DH8 nodes with SAN Volume Controller 2145-24F arrays installed.

In this example, the arrays are consolidated in the middle of the rack to separate between the odd and even-numbered nodes. On the upper left of the rack, space is reserved for a second set of arrays, if they are necessary. Because SAS cables must run within the cable management arms in the back of the nodes, ensure that you use the correct cable (FC ACUC: 3 m 12 Gb SAS cable) to attach the nodes to the enclosure.

Figure 5 shows that a single rack implementation of a new node includes a first set of the optional SAN Volume Controller 2145-24F arrays. In this example, the SAN Volume Controller 2145-24F arrays are placed between their corresponding node pairs. This example is less desirable than the consolidated example. This implementation requires that the first node is installed starting in first unit of the rack and leaves a two unit gaps in the rack. Because SAS cables must run within the cable management arms in the back of the nodes, ensure that you use the correct cable (FC ACUC: 3 m 12 Gb SAS cable) to attach the nodes to the enclosure.

Figure 6 and Figure 7 show a dual rack implementation of new nodes with the optional arrays. Because you must connect the node to their storage across a pair of racks, where you place the nodes and the arrays is important. Consider whether the cables between the rack is above or below the racks. These examples show a show cables that are below the rack. If the cables are placed above the rack, then the SAN Volume Controller 2145-24F arrays need to be at the top of the rack with the nodes grouped just below them. In this example, space is reserved at the top of the rack for data wiring, which is a best practice for most data centers. Because SAS cables must are run within the cable management arms in the back of the nodes, ensure that you use the FC ACUC: 3 m 12 Gb SAS cable to attach the nodes to the enclosure in the one rack and use FC ACUD: 6 m 12 Gb SAS cable to attach the nodes to the enclosure in the other rack.

Figure 8 shows an example of a single rack that contains a new SAN Volume Controller 2145-DH8 nodes that are being added to an existing system with SAN Volume Controller 2145-CG8 nodes. In this example, since earlier node models do not support SAN Volume Controller 2145-24F arrays, they are not used when SAN Volume Controller 2145-DH8 nodes are added to an existing system. In this example, space is reserved at the top of the rack for data wiring, which is a best practice for most data centers. The following example has the following specifications:

• Four single-phase 30 (US) or 32 (International) amp PDUs or 2 single-phase 60 (US) or 63 (International) amp PDUs
• 3.6-kilowatt total de-rated amount (.45 kilowatts per node)
• 16 total IEC320 C13 and C14 power cords and receptacles that are required across PDUs