Unisys NX5820 - Manual (Page 99)

Configuring Channels
7017 6300–005 5–11
Table 5–4. Guidelines for Configuring Channels
Rule Description
Channels Total Channels for NX5820 System:
A total of 254 logical channels are available per system.
For Domain 0, 130 physical channel connections are available (15 external CMFs x 8 =
120 channels plus 10 internal channels. One CMF use for dedicated server. Of the
10 internal channels, 4 are required for reserved channels, leaving 6 available for
internal channels).
For Domain 1, 138 physical channel connections are available (16 external CMFs x 8 =
128 channels plus 10 internal channels. No dedicated server. Of the 10 internal
channels; 4 are required for reserved channels, leaving 6 available for internal
channels).
Up to two (one per domain) CIOM are required for IOU functionality.
Total Channels for NX5820 K System:
A total of 254 logical channels are available per system.
For Domain 0, 162 physical channel connections are available (19 external CMFs x 8 =
152 channels plus 10 internal channels. One CMF use for dedicated server. Of the
10 internal channels, 4 are required for reserved channels, leaving 6 available for
internal channels).
For Domain 1, 170 physical channel connections are available (20 external CMFs x 8 =
160 channels plus 10 internal channels. No dedicated server. Of the 10 internal
channels; 4 are required for reserved channels, leaving 6 available for internal
channels).
Optionally, one CIOM in domain 0 is dedicated for Multi IOU functionality and one CIOM in
domain 1 is dedicated for TCU functionality. These two optional CIOMs can not
support CS-bus connectivity.
Reserved channels per domain:
One SCSI–2W channel (two channel loads) (3U) dual initiated for the QIC tape and CD-
ROM in the OSS7000.
One SCSI–2W channel (two channel loads) (3U) dual initiated for two hard drives in the
OSS7000.
One MAINTLAN channel (one load) (6U) for the Maintenance Hub.
One 802.3 high performance channel (one load) (6U) for the public LAN (Switching Hub).
Considerations The following considerations apply when configuring channels:
Each SCSI, MLI, and PCI thru channel card occupies one 3U card slot.
Each 802.3 LAN and MAINTLAN channel card occupy two 3U card slots (6U high)
Each FDDI, CDDI, ATM, and Fibre channel card occupy four 3U card slots (2 X 6U high).
Each additional 6U high channel card reduces the number of slots available for 3U
channel accordingly.