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

Page: 33 / 456

For information about disaster tolerance and failover protection, see “ SAN extension ” on page 279.
• 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 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
• 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
Recommended ISL ratios on page 44.
• 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 “
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, and
“ M-series switches and fabric rules ” on page 157.
• 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 “
SAN fabric topologies ” on page 35.
• 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 “
SAN fabric topologies ” on page 35.
SAN Design Reference Guide 33