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Fibre Channel Over IP

23Continuous Access and Data Replication Manager SAN Extensions Reference Guide

Continuous Access EVA with VCS V3.02 support

This section lists the VCS Version 3.02 specifications for FC switch firmware

revisions and the supported minimum and maximum transmission rates for

qualified switch and gateway device pairings. The speeds listed in tables 2 and 3

are the minimum and maximum speeds for the device, with the device being

capable of speeds within the range.

At this time, Continuous Access EVA can support the switch/gateway pairs in the

list below with the requirements shown in Table 5 through Table 7.

Note: Continuous Access EVA with VCS V3.02 is not recommended for any delay over

5 ms and for any bandwidth under 45 Mbps dual links.

Current list of tested and supported switch/gateway pairs:

■ B-series switch and HP SR2122-2 gateway

■ B-series switch and HP Multi-protocol Router

■ B-series switch and SAN Valley SL700 or SL1000 gateway

■ C-series MDS switch and Cisco IPS 8/4 gateway

■ C-series MDS9216i switch and MDS 14/2 Multiprotocol Services Module

■ M-series switch and HP SR2122-2 gateway

Existing Continuous Access EVA customers whose environments do not meet

these restrictions are likely to experience the issue described above, especially

during any full copy process. New Continuous Access EVA customers must meet

these requirements.

Table 5: General Requirements for long distance gateways with VCS 3.020

Bandwidth

Must be dedicated to the continuous access storage replication

function.

Note: No support for dynamic pacing of the gateway at this time

Maximum # of DR Groups See Table 6 and Table 7 for specific minimum supported

bandwidth based on the based on the average packet loss ratio

and the one-way intersite latencies

Maximum Transmission Unit

(MTU) of the IP network

Set to 1500 Bytes

Maximum Latency

100 mSec one way (200 mSec round trip)

1 2 ... 18 19 20 21 22 23 24 25 26 27 28 ... 119 120

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