Installation guide

C–8 Converting a Single-Host Configuration to a Dual-Host Configuration
NOTE
Ensure that both host systems and the SF200 storage array are
off-line and powered down
C.2.2 Single-Host to Dual-Host Cabling Conversion
The following procedure takes you through the steps to recable a DSSI
bus configured for single-host applications to a a DSSI bus configured for
dual-host application.
The five possible single-host bus configurations are shown in Figure C–3.
The three possible dual-host bus configurations are shown in Figure C–4.
The conversion of each existing DSSI bus in the SF200 storage array is
discussed individually in the following steps.
Follow each step for all DSSI buses present in the existing SF200 storage
array paying careful attention to all warnings, cautions, and notes.
The term DSSI bus n (where n = 1 to 6), refers to the DSSI buses used
by the host system, the SF200 storage array, the SF72 storage enclosures,
and the magazine tape subsystems. In the single-host configuration, the
four DSSI buses used are:
• DSSI bus 1, color code blue.
• DSSI bus 2, color code red.
• DSSI bus 3, color code yellow.
• DSSI bus 4, color code green.
In the dual-host configuration, the six DSSI buses used are:
• DSSI bus 1, color code blue.
• DSSI bus 2, color code red.
• DSSI bus 3, color code yellow.
• DSSI bus 4, color code green.
• DSSI bus 5, color code blue with a white strip.
• DSSI bus 6, color code red with a white strip.