Specifications

Fibre Channel Over IP

24 Continuous Access and Data Replication Manager SAN Extensions Reference Guide

The two tables below show the maximum supported data replication (DR) groups

and minimum bandwidth requirements for each switch-gateway pair in low loss

and high loss networks. In low loss networks, the average packet loss is less than

or equal to 0.0012%. In high loss networks, the average packet loss is less than or

equal to 0.2%.

Latency Jitter

Not to exceed 10 mSec over 24 hours

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

1. Pre-existing restriction

2. Packet loss ratio indicates the need to re-transmit data across the intersite link. Each re-transmission delays

packets queued up behind the current packet, increasing the time to complete those pending transactions.

Gateways listed in Table 6 are supported in low loss networks. Table 7 bases support on use of only high

loss networks.

3. Latency Jitter is the difference between the minimum and maximum delay; and is a measure of stability for

network delay; the greater the jitter, the greater the variance in the delay, which lowers the predictability of

the performance.

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

Table 6: Low Loss Network requirements for long distance switch-gateway pairs for VCS versions up

to and including V3.020

Switch and

Gateway Pair

Maximum Data Replication Groups and Minimum Bandwidth

For Dual Fabric For Single or Shared Fabric

B-series and

HP SR2122-2