HP McDATA 4Gb SAN Switch, Руководство по установке

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20 Planning
A zoning database is maintained on each switch consisting of the active zone set, all zones, and all zone
members.
Table 2 describes the zoning database limits. See the McDATA 4Gb SAN Switch for HP p-Class
BladeSystem user guide for more information.
Performance
The switch supports class 2 and class 3 FC service with a maximum frame size of 2148 bytes at
transmission rates of 1-Gbps, 2-Gbps, or 4-Gbps. An external port adapts its transmission speed to match
that of the device to which it is connected prior to login when the connected device powers up. Related
performance characteristics include the following:
•
Distance , page 20
•
Bandwidth , page 20
•
Latency , page 21
Distance
Consider the physical distribution of devices and switches in the fabric. Choose SFP transceivers that are
compatible with the cable type, distance, FC revision level, and the device. See ”
Specifications ” on
page 57 for more information about cable types and transceivers.
Each FC port is supported by a data buffer with an 8-credit capacity; that is, 8 maximum sized frames. For
fibre optic cables, this enables full bandwidth over the following approximate distances:
•
13 kilometers at 1-Gbps (0.6 credits/Km)
•
6 kilometers at 2-Gbps (1.2 credits/Km)
•
3 kilometers at 4-Gbps (2.4 credits/km)
Beyond these distances, however, there is some loss of efficiency because the transmitting port must wait
for an R_RDY response before sending the next frame.
Bandwidth
Bandwidth is a measure of the volume of data that can be transmitted at a given transmission rate. An FC
port can transmit or receive at nominal rates of 1-Gbps, 2-Gbps, or 4-Gbps depending on the device to
which it is connected. This corresponds to actual bandwidth values of 106 MB, 212 MB, and 425 MB.
Multiple source ports can transmit to the same destination port if the destination bandwidth is greater than
or equal to the combined source bandwidth. For example, two 1-Gbps source ports can transmit to one
2-Gbps destination port. Similarly, one source port can feed multiple destination ports if the combined
destination bandwidth is greater than or equal to the source bandwidth.
In multiple switch fabrics, each link between switches contributes 106, 212, or 425 MB of bandwidth
between those switches depending on the speed of the link. When additional bandwidth is needed
between devices, increase the number of links between the connecting switches.
Table 2
Zoning limits
Limit Description
MaxZoneSets Maximum number of zone sets (1).
MaxZones Maximum number of zones (2047).
MaxTotalMembers Maximum number of zone members (10,000) that can be
stored in the switch’s zoning database.
MaxZonesInZoneSets Maximum number of zones that are components of the
active zone set (2047), excluding the orphan zone set, that
can be stored in the switch’s zoning database.
MaxMembersPerZone Maximum number of members in a zone (10,000)