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C.2 Conversion Procedure

Table C–1 DSSI ID Switch Settings (Sx72 Only)

Sx300 Positions 1, 2, 3, 4, 5, and 6

Left Rear (LR)

Left Front (LF)

001

010

Right Front (RF)

Right Rear (RR)

011

100

The switch settings for OCPs in these positions are 0 = down and 1 = up.

C.2.3 Single-Host to Dual-Host Cabling Conversion

Note

Make sure that both host systems and the Sx300 storage array are

off-line and powered down.

This procedure explains the steps to recable a DSSI bus conﬁgured for a

single-host application to a DSSI bus conﬁgured for a dual-host application.

Figure C–5 shows the ﬁve possible single-host bus conﬁgurations. Figure C–6

shows the three possible dual-host bus conﬁgurations.

The steps describe the conversion of each DSSI bus in the Sx300 storage array

individually. Follow each step for all DSSI buses present in the Sx300 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 Sx300 storage array, the Sx72 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

C–8 Converting a Single-Host Conﬁguration to a Dual-Host Conﬁguration

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Manx SA7x Guía de instalación Pagina 280