HP StorageWorks 4000/6000/8000 .HP StorageWorks SAN Design Reference Guide, Pa - Page 33

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 logical 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