HP StorageWorks 4000/6000/8000 .HP StorageWorks SAN Design Reference Guide, Pa - Page 46

Topology data access, Topology maximums, Local one-to-one, Centralized many-to-one

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Topology data access To choose a SAN fabric topology, you must determine which data access type is appropriate for your environment. The data access types are as follows: • Local (one-to-one)-Data access between a local server and a storage system connected to the same switch • Centralized (many-to-one)-Data access between multiple, dispersed servers and one centrally located storage system • Distributed (many-to-many)-Data access between multiple, dispersed servers and storage systems Table 3 lists the data access performance ratings for each SAN fabric topology. Table 3 Data access performance by SAN fabric topology SAN topology Single-switch fabric Cascaded fabric Meshed fabric Ring fabric Core-edge fabric (15:1, 7:1) Local Highest Highest Medium Highest Medium Data access performance Centralized Highest Not recommended Medium Medium Distributed Highest Not recommended High Not recommended High High Core-edge fabric (3:1, 1:1) High Highest Highest Topology maximums Table 5, Table 6, and Table 7 describe the maximum number of supported switches and ports for specific fabric topologies. In some cases, the number may be less than the maximums specified in the switch and fabric rules chapters. These differences relate to the number of hops in the fabric topology, as well as the number of ISLs, which affects the number of available user ports. Consider the following: • User ports are for server and storage connections. • It is assumed that you have the minimum number of ISLs. If you require more ISLs, this reduces the number of user ports available for server and storage connections. See the following chapters for configuration limits: • "H-series switches and fabric rules" on page 83 • "B-series switches and fabric rules" on page 93 • "C-series Fibre Channel and FCoE switches and fabric rules" on page 135 • "M-series switches and fabric rules" on page 157 • If you connect a Storage Management Appliance to the fabric, this further reduces the number of ports available for server and storage connections. 46 SAN fabric topologies

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Topology data access
To choose a SAN fabric topology, you must determine which data access type is appropriate for your
environment. The data access types are as follows:
•
Local (one-to-one)
—
Data access between a local server and a storage system connected to the
same switch
•
Centralized (many-to-one)
—
Data access between multiple, dispersed servers and one centrally
located storage system
•
Distributed (many-to-many)
—
Data access between multiple, dispersed servers and storage systems
Table 3
lists the data access performance ratings for each SAN fabric topology.
Table 3 Data access performance by SAN fabric topology
Data access performance
SAN topology
Distributed
Centralized
Local
Highest
Highest
Highest
Single-switch fabric
Not recommended
Not recommended
Highest
Cascaded fabric
High
Medium
Medium
Meshed fabric
Not recommended
Medium
Highest
Ring fabric
High
High
Medium
Core-edge fabric
(15:1, 7:1)
Highest
Highest
High
Core-edge fabric
(3:1, 1:1)
Topology maximums
Table 5
,
Table 6
, and
Table 7
describe the maximum number of supported switches and ports for
specific fabric topologies. In some cases, the number may be less than the maximums specified in the
switch and fabric rules chapters. These differences relate to the number of hops in the fabric topology,
as well as the number of ISLs, which affects the number of available user ports.
Consider the following:
•
User ports are for server and storage connections.
•
It is assumed that you have the minimum number of ISLs. If you require more ISLs, this reduces the
number of user ports available for server and storage connections. See the following chapters for
configuration limits:
•
“
H-series switches and fabric rules
”
on page 83
•
“
B-series switches and fabric rules
”
on page 93
•
“
C-series Fibre Channel and FCoE switches and fabric rules
”
on page 135
•
“
M-series switches and fabric rules
”
on page 157
•
If you connect a Storage Management Appliance to the fabric, this further reduces the number of
ports available for server and storage connections.
SAN fabric topologies
46