Drive Enclosure Wiring Diagrams

SAS cables establish the Backend SAS Interconnect of an Oracle FS System. SAS cables connect Drive Enclosures to Drive Enclosures and the Controller SAS HBA ports to the Drive Enclosure strings.

Usage Conventions for Cabling Drive Enclosure

The following usage conventions summarize how the ports are used when cabling Drive Enclosures:

Controller 1 HBA ports 0 and ports 1 connect to the first Drive Enclosure (I/O module 0, port 0) in a string.
Controller 2 HBA ports 0 and ports 1 connect to the third Drive Enclosure (I/O module 1, port 0) in strings that support three or more Drive Enclosures.
Controller 2 HBA ports 0 and ports 1 connect to the second Drive Enclosure (I/O module 1, port 0) or to the first Drive Enclosure (I/O module 1, port 0) in strings that support less than three Drive Enclosures.
I/O module 0, port 1 connects to the second Drive Enclosure (I/O module 0, port 0) and to the third Drive Enclosure (I/O module 0, port 0) in a string.
I/O module 1, port 2 connects to the fourth Drive Enclosure (I/O module 1, port 0) and to the fifth Drive Enclosure (I/O module 1, port 0) in a string.

Note: The Oracle FS System supports three hops from the HBAs.

Drive Enclosure String Distribution

Drive Enclosures are distributed among the strings so that all of the available SAS HBA ports designated for Drive Enclosures are used as equally as possible. The sequence of distributing strings is based on the performance capabilities of the drives installed in the Drive Enclosures.

For optimal performance, first distribute the Drive Enclosures with the highest performance drives across the strings and then continue sequentially until all of the Drive Enclosures are distributed to the strings. The number of Drive Enclosures on the shortest string should not differ from the number Drive Enclosures on the longest string by more than one Drive Enclosure.

The following table summarizes the string distribution for systems with one SAS HBA per Controller. A system with one SAS HBA per Controller can have one to 10 Drive Enclosures distributed across two strings.

Table 1 One SAS HBA per Controller
DE Add Order	String number	SAS HBA PCI slot	Port on SAS HBA	DE number within string
1	1	Slot 3	0	1
2	2	Slot 3	1	1
3	1	Slot 3	0	2
4	2	Slot 3	1	2
5	1	Slot 3	0	3
6	2	Slot 3	1	3
7	1	Slot 3	0	4
8	2	Slot 3	1	4
9	1	Slot 3	0	5
10	2	Slot 3	1	5

The following table summarizes the string distribution for systems with two SAS HBAs per Controller. A system with two SAS HBAs per Controller can have one to 20 Drive Enclosures distributed across four strings.

Table 2 Two SAS HBAs per Controller
DE Add Order	String number	SAS HBA PCI slot	Port on SAS HBA	DE number within string
1	1	Slot 3	0	1
2	2	Slot 6	0	1
3	3	Slot 3	1	1
4	4	Slot 6	1	1
5	1	Slot 3	0	2
6	2	Slot 6	0	2
7	3	Slot 3	1	2
8	4	Slot 6	1	2
9	1	Slot 3	0	3
10	2	Slot 6	0	3
11	3	Slot 3	1	3
12	4	Slot 6	1	3
13	1	Slot 3	0	4
14	2	Slot 6	0	4
15	3	Slot 3	1	4
16	4	Slot 6	1	4
17	1	Slot 3	0	5
18	2	Slot 6	0	5
19	3	Slot 3	1	5
20	4	Slot 6	1	5

The following table summarizes the string distribution for systems with three SAS HBAs per Controller. A system with three SAS HBAs per Controller can have one to 30 Drive Enclosures distributed across six strings.

Table 3 Three SAS HBAs per Controller
DE Add Order	String number	SAS HBA PCI slot	Port on SAS HBA	DE number within string
1	1	Slot 3	0	1
2	2	Slot 6	0	1
3	3	Slot 2	0	1
4	4	Slot 3	1	1
5	5	Slot 6	1	1
6	6	Slot 2	1	1
7	1	Slot 3	0	2
8	2	Slot 6	0	2
9	3	Slot 2	0	2
10	4	Slot 3	1	2
11	5	Slot 6	1	2
12	6	Slot 2	1	2
13	1	Slot 3	0	3
14	2	Slot 6	0	3
15	3	Slot 2	0	3
16	4	Slot 3	1	3
17	5	Slot 6	1	3
18	6	Slot 2	1	3
19	1	Slot 3	0	4
20	2	Slot 6	0	4
21	3	Slot 2	0	4
22	4	Slot 3	1	4
23	5	Slot 6	1	4
24	6	Slot 2	1	4
25	1	Slot 3	0	5
26	2	Slot 6	0	5
27	3	Slot 2	0	5
28	4	Slot 3	1	5
29	5	Slot 6	1	5
30	6	Slot 2	1	5

Drive Enclosure SAS Wiring Diagrams

The following wiring diagrams show the cabling of Drive Enclosures for one complete string in a system. The same cabling pattern applies to all of the strings in a system. Remember to distribute Drive Enclosures among the strings so that all of the available SAS HBA ports designated for Drive Enclosures are used as equally as possible.

Note: The following wiring diagrams show DE2-24P Drive Enclosures. Note the position of the SAS ports and the reverse orientation of the two I/O modules on the DE2-24P Drive Enclosures. Conversely, the two I/O modules on the DE2-24C Drive Enclosures have an identical orientation. Remember the orientation of the I/O modules and the location of the SAS ports as you cable the system.

The following figure illustrates the SAS cabling for one Drive Enclosure string containing one Drive Enclosure.

Figure 1: SAS wiring diagram for one string with one Drive Enclosure

The following figure illustrates the SAS cabling in a system that is configured with one Drive Enclosure string containing two Drive Enclosures. The same cabling pattern applies to all of the strings in a system. Remember to distribute Drive Enclosures among the strings so that all of the available SAS HBA ports designated for Drive Enclosures are used as equally as possible.

Figure 2: SAS wiring diagram for one string with two Drive Enclosures

The following figure illustrates the SAS cabling in a system that is configured with one Drive Enclosure string containing three Drive Enclosures. The same cabling pattern applies to all of the strings in a system. Remember to distribute Drive Enclosures among the strings so that all of the available SAS HBA ports designated for Drive Enclosures are used as equally as possible.

Figure 3: SAS wiring diagram for one string with three Drive Enclosures

The following figure illustrates the SAS cabling in a system that is configured with one Drive Enclosure string containing four Drive Enclosures. The same cabling pattern applies to all of the strings in a system. Remember to distribute Drive Enclosures among the strings so that all of the available SAS HBA ports designated for Drive Enclosures are used as equally as possible.

Figure 4: SAS wiring diagram for one string with four Drive Enclosures

The following figure illustrates the SAS cabling in a system that is configured with one Drive Enclosure string containing five Drive Enclosures. The same cabling pattern applies to all of the strings in a system. Remember to distribute Drive Enclosures among the strings so that all of the available SAS HBA ports designated for Drive Enclosures are used as equally as possible.

Figure 5: SAS wiring diagram for one string with five Drive Enclosures