Ip Performance Tuning; Network Requirements For The Mpx200 With Xcs And Vcs - HP StorageWorks MPX200 User Manual

FC switch requirements
For additional B-series and C-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
• 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
• For MPX200 IP management—LAN and WAN are supported.
• For XP Continuous Access network requirements, see the SAN Extension chapter in the
nl
HP StorageWorks SAN Design Reference Guide.
Table 17 Network requirements for the MPX200 with XCS and VCS
Specification
1
Bandwidth
Maximum number of DR groups
MTU of the IP network
Maximum latency
Average packet-loss ratio
3
Latency jitter
1
Pre-existing restriction
2
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.
3
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
17).
1
2
Storage system rules and
Description
Must be dedicated to the HP Continuous Access storage replica-
tion Bandwidth function. There is no support for dynamic pacing
of the gateway.
See Table 16 for minimum supported bandwidth based on the
average maximum number of DR groups packet-loss ratio and
one-way intersite latencies.
1,500 bytes
EVA: 100 ms one-way or 200 ms round-trip
Low-loss network: 0.0012% average over 24 hours
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.
MPX200 Multifunction Router User Guide
guidelines, page 130.
131