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Fibre Channel Over IP

30 Continuous Access and Data Replication Manager SAN Extensions Reference Guide

Continuous Access EVA with VCS V5.020 support

The section list the VCS Version 5.020 specifications for FC switch firmware

revisions and the supported minimum and maximum transmission rates for

qualified switch and gateway device pairings. The speed listed in tables X and X

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

capable of speed within the range.

Note: Applications usually require more bandwidth than the minimum due to

throughput requirements. Read the CA EVA Performance Estimator User Guide for

more details on link sizing. To grow beyond the maximum number of DR groups at the

minimum bandwidth, best practice is to add the maximum number of DR groups for

each additional minimum bandwidth. For example, if the maximum is 5 DR groups at

5 Mbps, then its 10 DR groups at 10 Mbps, 15 DR groups at 15 Mbps, up to 128 DR

groups requiring at least 130 Mbps.

Table 12: General Intersite Network Requirements when using long distance gateways

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 13, through Table 15 (below) 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 one way or 200 mSec round trip

Average Packet Loss Ratio

Low Loss Network: 0.0012% averaged over 24 hours

High Loss Network: 0.2% averaged over 24 hours, not to exceed 0.5%

for more than 5 minutes within a 2 hour window

Latency Jitter

Not to exceed 10 mSec over 24 hours

1. Pre-existing restriction

2. Packet loss ratio is an indication of the need to re-transmit data across the intersite link, Each

re-transmission in effect delays all those queued up behind the current packet, thus increasing the time to

complete those pending transactions in the queue. Unless marked, gateways listed in tables 2 through 4

are supported in both the low loss and high loss networks. Tables 2 though 4 (below) base support on use

of high loss networks.

3. Latency Jitter is the difference between the minimum and maximum values; and is a measure of how stable

or predictable the delay is in the network, the greater the jitter, the greater the variance in the delay, which

lowers the predictability of the performance.

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