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
•
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
S
P
A
R
E
S
P
A
R
E
S
P
A
R
E
S
P
A
R
E
S
P
A
R
E
S
P
A
R
E
7 6 5 4 3 2 1
7 6 5 4 3 2 1
7 6 5 4 3 2 1
7 6 5 4 3 2 1
7 6 5 4 3 2 1
7 6 5 4 3 2 1
Cage 1
Cage 2
Cage 3
Cage 4
Cage 5
Cage 6
Spare Ratio 1:47
S
P
A
R
E
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
8
7 6 5 4 3 2 1
8
7 6 5 4 3 2 1
8
7 6 5 4 3 2 1
8
7 6 5 4 3 2 1
8