Chapter 3. IBM System Storage DS4000 and DS5000 hardware 61
Figure 3-33 Enclosure connections order
3.4.9 DS5100 and DS5300 storage subsystem drive-side cabling
The following rules apply while cabling the DS5000 with an expansion enclosure:
The maximum number of expansion enclosures (EXP5000 or EXP810) in a drive loop is
limited to seven, as the maximum 112 disks limitation is reached with seven enclosures
configured with 16 drives each.
Each FC-drive and expansion unit (EXP) in the drive channel must operate at the same
Fibre Channel speed (either 2 Gbps or 4 Gbps). SATA drives autonegotiate to the speed of
the EXP.
The DS5000 controller drive port must always be connected to the EXP5000 port labelled
1B. Because the left and right EXP5000 ESMs (ESMs A and B) are inserted in the ESM
bays in different orientations, ensure that you use the port labeled 1B, as shown in
Figure 3-34. This applies to the previous DS4800 and DS4700 with its expansion units in
the same way. Port 1A is used to daisy-chain the next expansion units, which we refer to
later in this section
Figure 3-34 Port labels on EXP5000
Note: The numbering in Figure 3-33 is to help with the growth of a subsystem by adding
enclosures. It is not indicative of channel or port numbers.
Note: To achieve the best performance, spread all your expansion units among all port
channels.
1A
1B
1A 1B
Left ESM
Right ESM
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