Mpio HD 200 Guide de l'utilisateur télécharger pdf (Page 121)

FC switch requirements

For additional B-series, C-series, and H-series FC switches, local and remote MPX200 Multifunction

Router pairs must be connected to the same Fibre Channel switch product line series.

NOTE: The MPX200 Fibre Channel ports operate at 2, 4, and 8 Gb/s.

IP network requirements

HP requires that the following standards be met for the IP network:

• Supported network protocols are TCP/IP IPv4 and IPv6 Ethernet 1,000 Mb/s.

For minimum IP bandwidth requirements, see “Storage system rules and guidelines” (page 120).

• For MPX200 IP data—Local and remote pairs are supported for up to 100 ms of IP network

delay one-way, or 200 ms round-trip for HP Continuous Access. HP requires dedicated IP

bandwidth (see Table 20 (page 121)).

• For MPX200 IP management—LAN and WAN are supported.

• For XP Continuous Access network requirements, see the SAN Extension chapter in the HP

StorageWorks SAN Design Reference Guide.

Table 20 Network requirements for the MPX200 with XCS and VCS

DescriptionSpecification

Must be dedicated to the HP Continuous Access storage replication

Bandwidth function. There is no support for dynamic pacing of the

gateway.

Bandwidth

See Table 19 (page 120) for minimum supported bandwidth based on

the average maximum number of DR groups packet-loss ratio and

one-way intersite latencies.

Maximum number of DR groups

1,500 bytesMTU of the IP network

EVA: 100 ms one-way or 200 ms round-tripMaximum latency

Low-loss network: 0.0012% average over 24 hoursAverage packet-loss ratio

High-loss network: 0.2% average over 24 hours; must not exceed 0.5%

for more than 5 minutes in a 2-hour window

Must not exceed 10 ms over 24 hours.Latency jitter

Pre-existing restriction

A high packet-loss ratio indicates the need to retransmit data across the intersite link. Each retransmission delays

transmissions queued behind the current packet, thus increasing the time to complete pending transactions.

Latency jitter is the difference between the minimum and maximum values, and indicates how stable or predictable the

network delay. The greater the jitter, the greater the variance in the delay, which lowers the performance predictability.

IP performance tuning

The MPX200 supports Fibre Channel service at transmission rates of 2 Gb/s, 4 Gb/s or 8 Gb/s

with a maximum frame size of 2,148 bytes. It supports Ethernet service at transmission rates of

1,000 or 100 Mb/s with an MTU size between 1,000 and 9,000 bytes (jumbo frames). Related

performance characteristics include the following:

• Distance

• Bandwidth per route

• Latency

• MTU/Jumbo frames

• Compression

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Mpio HD 200 Guide de l'utilisateur Page 121

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