# PD hints:Controller and drive enclosures

## Controller units and drive enclosures

Figure 1 shows an EXP400 SCSI disk drive enclosure with two hot-swappable ESM modules.

Each ESM has a SCSI connector that supports up to seven Ultra320 SCSI hard disk drives. This unit can be connected to a DS400 storage subsystem. For troubleshooting help on the EXP400, click on the following link:

ftp://ftp.software.ibm.com/pc/pccbbs/pc_servers_pdf/90p3548.pdf

Figure 1. EXP400 SCSI drive enclosure

Figure 2 shows the locations of the controller connections in a DS400 Fibre Channel storage subsystem. Table 1 shows the WWNN and WWPN assignment convention.

Figure 2. DS400 controller connection locations

Table 1 - WWNN and WWPN assignment convention

Node and Port Name Convention | Enclosure | FC0 | FC1
Node Name | 20000000d1262472 | NA | NA
A Controller Port names | NA | 21000000d1262472 | 21010000d1262472
B Controller Port names | NA | 21020000d1262472 | 21030000d1262472

Figure 3 shows a configuration containing both a DS400 controller unit and an EXP400 expansion unit. The host connection to the DS400 uses optical cables to the controller SFPs. The connection to the EXP400 uses SCSI cables.

Figure 3. DS400 and EXP400 configuration

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