HP StorageWorks 4000/6000/8000 - Enterprise Virtual Arrays Reference Manual page 33

For information about disaster tolerance and failover protection, see
Switch and hop counts
Minimize the number of hops between devices that communicate regularly in the SAN.
For information about switches and hop counts, see:
"H-series switches and fabric
"B-series switches and fabric
"C-series Fibre Channel and FCoE switches and fabric
"M-series switches and fabric
Oversubscription
For improved performance, reduce the potential for oversubscription. Ensure that the SAN design
provides an adequate number of ISLs between switches, and minimize cases where many devices
share a single-switch ISL.
For information about oversubscription, see
Data locality, performance, and application workloads
Provide an adequate level of performance based on application workloads. For frequent data
reference and quick response times, use local, high-capacity paths to connect servers and storage
systems. Deploy servers and storage in your SAN based on your data access requirements.
See "SAN fabric topologies" on page 35.
Manageability
To enhance efficiency, you can manage consolidated storage from a centralized location.
Fabric zoning
You can use fabric zoning to control SAN access at the device or port level.
For information about zoning, see
"B-series switches and fabric
"C-series Fibre Channel and FCoE switches and fabric
"M-series switches and fabric
Selective Storage Presentation
To provide data access security and enable storage system use by multiple operating systems in
a single SAN, use SSP.
SAN security
Use a combination of SAN features and sound management practices to ensure data security
throughout the SAN.
Fibre Channel routing functionality
To increase the number of devices accessible in a SAN, use Fibre Channel routing functionality
to interconnect existing SAN fabrics. Virtual Fabrics, or VSANs.
For routing functionality information, see
Virtual Fabrics (B-series switches) and virtual SANs (C-series switches)
To create a SAN consisting of multiple logical SANs with separate fabric services, implement lo-
gical fabrics or VSANs. Use the IFR or inter-VSAN routing feature to enable device sharing across
Virtual Fabrics or VSANs.
For information about Virtual Fabrics and VSANs, see
rules" on page 83
rules" on page 93
rules" on page 157
Recommended ISL ratios
"H-series switches and fabric
rules" on page 93,
rules" on page 157.
"SAN fabric
"SAN extension" on page 279.
rules" on page 135
on page 44.
rules" on page 83,
rules" on page 135, and
topologies" on page 35.
"SAN fabric topologies" on page 35.
SAN Design Reference Guide 33