EMC CX500I Configuration Guide - Page 90

Implementing SAN Copy Over Extended Distances, Performance Considerations, Network Performance

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Data Replication and Data Mobility Software Implementing SAN Copy Over Extended Distances SAN Copy supports protocols that let you use the IP WAN to send LUN data over extended distances. In order to do this, you need to extend your switch fabric by using Fibre Channel-to-IP converters that allow Fibre Channel devices to communicate over TCP/IP networks. When using SAN Copy over IP, a read operation will be faster than a write operation. Performance Considerations To get the best performance when implementing SAN Copy over IP, it is important to consider the following performance factors: ◆ Network performance ◆ SAN Copy configuration ◆ Data compression Network Performance The quality of the network is a critical factor in determining SAN Copy performance, especially with respect to latency (delay in the network) and bandwidth (frequency of the transferred bits). SAN Copy Configuration In order to address the network performance issues, SAN Copy lets you configure the buffers the SAN Copy operations use. Data Compressibility Data compression allows more data to be sent a given amount of time, effectively multiplying the effective bandwidth. The amount of data compression depends on many factors, such as data type, compression algorithm of the equipment, and line speed. Figure 4-6 shows a sample SAN Copy over IP configuration. In this example, LUN data is being transferred over the IP storage network using two FC-IP converters. Depending on the direction of the data transfer, the FC-to-IP converter either converts Fibre Channel data to IP data or IP data to Fibre Channel data. 4-28 EMC CLARiiON CX300, CX500, CX500i, and CX700 Storage Systems Configuration Planning Guide

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4-28
EMC CLARiiON CX300, CX500, CX500i, and CX700 Storage Systems Configuration Planning Guide
Data Replication and Data Mobility Software
Implementing SAN Copy Over Extended Distances
SAN Copy supports protocols that let you use the IP WAN to send
LUN data over extended distances. In order to do this, you need to
extend your switch fabric by using Fibre Channel-to-IP converters
that allow Fibre Channel devices to communicate over TCP/IP
networks.
When using SAN Copy over IP, a read operation will be faster than a write
operation.
Performance Considerations
To get the best performance when implementing SAN Copy over IP,
it is important to consider the following performance factors:
◆
Network performance
◆
SAN Copy configuration
◆
Data compression
Network Performance
The quality of the network is a critical factor in determining SAN
Copy performance, especially with respect to latency (delay in the
network) and bandwidth (frequency of the transferred bits).
SAN Copy Configuration
In order to address the network performance issues, SAN Copy lets
you configure the buffers the SAN Copy operations use.
Data Compressibility
Data compression allows more data to be sent a given amount of
time, effectively multiplying the effective bandwidth. The amount of
data compression depends on many factors, such as data type,
compression algorithm of the equipment, and line speed.
Figure 4-6 shows a sample SAN Copy over IP configuration. In this
example, LUN data is being transferred over the IP storage network
using two FC-IP converters. Depending on the direction of the data
transfer, the FC-to-IP converter either converts Fibre Channel data to
IP data or IP data to Fibre Channel data.