Spare allocation examples, Figure 26 – ClearCube R Series Pentium 4 User Manual

Page 68

58 • Cage and Blade Installation

ClearCube Product Manual and Installation Guide

Cages within a single Control Chain. The Admin Daisy Chain uses the same

ClearCube proprietary data link that connects Blades to C/Ports.

NOTE: When configuring an Admin Daisy Chain, the Admin C/Port must be

located within 100 meters of the equipment rack if using CAT5 or CAT5e

cable, or within 50 meters of the equipment rack if using CAT6, when the

Chain has 9 Cages or more. When the Admin Daisy Chain has 8 Cages

or fewer, the standard distance lengths for C/Port cabling apply. See

Table 2 on page 26.

•

Spare Daisy Chain – The link between a Spare Blade and the Cage or Cages

served by that Spare Blade. A Spare Daisy Chain can connect from 1 to 14 Cages

within a single Control Chain. The Spare Daisy Chain uses the same ClearCube

proprietary data link that connects Blades to C/Ports.

Spare Allocation Examples

When using the spare switching feature of the BackPack, you must consider how to

arrange your spares and how many to use. The BackPack can support a ratio of one

spare for one active PC Blade. A more common ratio is one spare for every seven

active Blades. The lowest ratio of sparing that ClearCube recommends is one spare

for 47 PC Blades (configured by daisy-chaining the spare connections). Figure 26

shows these sparing scenarios as examples.

For more information on the operation of your Blade Switching BackPack, refer to the

Switch Manager Administrator’s Guide.

For a dual-processor PC Blade, verify that the C/Port cable is plugged into the even

numbered port (e.g., for a PC Blade installed in Cage slots 3 and 4, the C/Port cable

should be plugged into port 4).

Figure 26 Spare Allocation Examples

Spare Ratio 1:7

E
S

7 6 5 4 3 2 1

Cage 1

Cage 2

Cage 3

Cage 4

Cage 5

Cage 6

Spare Ratio 1:47

7 6 5 4 3 2 1

Cage 1

Cage 2

Cage 3

Cage 4

Cage 5

Cage 6

7 6 5 4 3 2 1

This manual is related to the following products:

R Series