Topology Data Access; Topology Maximums; Ring Fabric; Data Access Performance By San Fabric Topology - HP StorageWorks 4000/6000/8000 - Enterprise Virtual Arrays Reference Manual
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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)
Core-edge fabric
(3:1, 1:1)
Topology maximums
Table
5,
Table
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
"B-series switches and fabric
"C-series Fibre Channel and FCoE switches and fabric
"M-series switches and fabric
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
Local
Highest
Highest
Medium
Highest
Medium
High
6, and
Table 7
describe the maximum number of supported switches and ports for
rules" on page 83
rules" on page 93
rules" on page 157
Data access performance
Centralized
Highest
Not recommended
Medium
Medium
High
Highest
rules" on page 135
Distributed
Highest
Not recommended
High
Not recommended
High
Highest
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