Specifications

DATA CENTER BEST PRACTICES
SAN Design and Best Practices 74 of 84
Metrics and Impact on SAN Design and Performance
The following table details the metrics that need to be collected and their impact on SAN design and
performance.
Metric Source Impact
Servers in the SAN Estimate/Brocade SAN Health Normal operations
Host Level Mirroring Estimate Distance, ISL congestion, trafc
levels
Clusters (MSFT, HACMP, NetApp)
•Average Number of nodes
•Workload level
Estimate
Estimate: High/Med/Low
In-band heartbeat, frame
congestion, host fan-in, trafc
isolation
Virtualization: VIO Server
# of servers
Consolidation ratio
Estimate
Estimate
Estimate
Frame congestion, edge trafc
increase/port, server fan-in on
target ports, device latencies
Virtualilzation: VMware
# of VMware servers
Consolidated ratio
Shared VMFS?
DRS?
RDM?
I/O intensive
Estimate
Estimate
Yes/No
Yes (%)/No
Yes (%)/No
High/Med/Low
Frame congestion, device
latencies, and SCSI2 reservations