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SERVSWITCH™ AND SERVSWITCH ULTRA™
4.3.9 S
ET
W
IDTH OF
S
UBMASTERS
(IBM
AND
M
ULTIPLATFORM
M
ODELS
O
NLY
)
Use this command to tell an IBM only or multiplatform ServSwitch master how
“wide” your submasters are (that is, how many ports each of them has). If your
submasters are all 4-port models,
set the Width to 4; if they are all 8-port models, set
the Width to 8; and so on.
Because initial configuration and reconfiguration would be complex and time-
consuming otherwise, Width is an all-or-nothing proposition for the ServSwitch:
One Width value is used for every port. Because this is true, we strongly
recommend that all submasters you attach to a master ServSwitch be the same size.
If you must attach different-sized submasters, please recognize that you probably
either will be unable to use some ports or will have to account for nonexistent
ports when you calculate port numbers and when you scan. See Section 3.3.2.
Figure 4-1 on the next page is an illustration of why ServSwitches need to know
this value. Without a number for Width—even assuming that Units is set correctly
to 4—if you were to select CPU 7 on either Switch, they would not know whether
CPU 7 was attached to the submaster on port 4, the one on port 2, or (though an
example of this isn’t shown) the one on port 1. With Width, the ServSwitch knows
to switch to port 4 and send the “switch to port 1” command if Width is 2, or to
switch to port 2 and send the “switch to port 3” command if Width is 4.
The default setting for Width is 16. To issue the Set Width of Submasters
command for a ServSwitch (which you may do at any time), press and release the
left Control key, type [W] followed by the number of ports on the attached
submasters (from 1 to 3 digits), and press [ENTER]. Enter the Keep Settings
command after you enter this command. Width can be set to any value from 2 to
255, but Width values higher than 16 (allowed in order to support future
expansion capabilities) might cause the ServSwitch to behave unpredictably.