Theory of Operation
2–17
2.3.2 SF7x Operating Modes
SF7x series storage enclosures can operate in either through-bus or
split-bus mode. These modes are described in the following sections.
2.3.2.1 Through-Bus Mode
In through-bus mode, all four drive positions (if occupied or not) are
connected to one DSSI bus. The drive positions are physically connected
(facing the front of the enclosure):
• Left-rear position (DSSI ID = 1)
• To left-front position (DSSI ID = 2)
• To right-front position (DSSI ID = 3)
• To right-rear position (DSSI ID = 4)
2.3.2.2 Split-Bus Mode
In split-bus mode, the two ISEs on the right side of the enclosure are
connected to one DSSI bus while the two ISEs on the left side of the
enclosure are connected to another DSSI bus. The drive positions are
physically connected (facing the front of the enclosure):
• Left-rear position (DSSI ID = 5 or 1, for single-system or stripe set)
• To left-front position (DSSI ID = 6 or 2, for single-system or stripe set)
• Right-front position (DSSI ID = 6 or 2, for single-system or stripe set)
• To right-rear position (DSSI ID = 5 or 1, for single-system or stripe
set)
Summary of Contents for EK-SFXXS-SG-003
Page 1: ...DECarray Service Guide EK SFXXS SG 003 Digital Equipment Corporation ...
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Page 18: ...1 8 Introduction Figure 1 3 SF7x Series Storage Enclosure SHR_X1123C_89 ...
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Page 168: ...6 60 SF7x Storage Enclosure FRU Replacement Figure 6 18 Enclosure Internal DSSI Cables ...
Page 169: ...SF7x Storage Enclosure FRU Replacement 6 61 Figure 6 19 Enclosure Internal DSSI Cables cont ...
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