.Part 4 SAN Extension and Bridging HP SAN Design Reference Guide 785354-001

Table 164 Network requirements for long-distance IP gateways with HP P9000 (XP) Continuous
Access (continued)
RequirementSpecification
See Table 156 (page 305), Table 157 (page 306), and Table 158 (page 306).Maximum latency
1
Low-loss network: 0.0012% average over 24 hours
Average packet-loss ratio
2
High-loss network: 0.2% average over 24 hours; must not exceed 0.5% for
more than 5 minutes in a two-hour window
Must not exceed 10 ms over 24 hoursLatency jitter
3
1
Pre-existing restriction
2
A high packet-loss ratio indicates the need to retransmit data across the ISL. Each retransmission delays transmissions
queued behind the current packet, thus increasing the time to complete pending transactions. Unless noted otherwise,
gateways listed in Table 165 (page 314) are supported in both low-loss and high-loss networks.
3
Latency jitter is the difference between the minimum and maximum values, and indicates how stable or predictable the
network delay is. The greater the jitter, the greater the variance in the delay, which lowers the performance predictability.
NOTE: Applications typically require more than the minimum bandwidth to meet throughput
requirements. For more information on link sizing, see the HP StorageWorks XP Continuous Access
User Guide.
Table 165 (page 314), Table 166 (page 316), and Table 167 (page 316) list the IP gateways supported
for use with HP P9000 (XP) Continuous Access.
Table 165 HP P9000 (XP) Continuous Access FCIP gateway support
Notes
XP storage
system
Product and
minimum
supported
firmware version
Requires a B-series or C-series switch between the XP storage systems and the gateways
with the following settings and packet-loss criteria:
P9500
XP24000
HP IP Distance
Gateway
(mpx110)
1
• TCP window size = 5 or 6
XP20000
• Average packet-loss ratio maximum = 0.1%
XP12000
Enable compression for IP fabrics with a RTT greater than or equal to 50 ms or guaranteed
WAN bandwidth of less than or equal to 45 Mb/s. For performance tuning information
XP10000
based on the link speed and delay, see the HP StorageWorks IP Distance Gateway User
Guide.
Requires a B-series or C-series switch between the XP storage systems and the gateways
with the following settings and packet-loss criteria:
P9500
XP24000
HP MPX200
Multifunction
Router with FCIP
1
• TCP window size = 5 or 6
XP20000
• Average packet-loss ratio maximum = 0.1%
XP12000
For compression usage recommendations, see the HP MPX200 Multifunction Router User
Guide at http://www.hp.com/go/mpx200.
XP10000
P9500
B-series1606
Extension SAN
Switch
• Can be used as a switch and FCIP gateway with XP storage systems directly connected
XP24000
XP20000
• Can be used for Fibre Channel to Fibre Channel routing
• Requires iodSET (in-order delivery)
DC Dir Switch MP
Extension Blade
XP12000
• Supports the following routing settings:
Port-based routing:
For firmware
versions, see
314 SAN extension