Reference Guide

Storage efficiency
Due to high I/Os on the underlying disks, stretched clusters require an underlying infrastructure capable of delivering high I/Os
with low latency. Dell Technologies recommends all-flash configurations for stretched cluster deployments.
All-flash configurations do not have a cache tier. The following table shows the difference in storage efficiency for a two-way
and three-way mirror created on a single site and stretched cluster environment:
Table 7. Storage efficiency differences
Two-Way Mirror Three-Way Mirror
Single site 50% 33%
Stretched cluster 25% 16.5%
Test-SRTopology
This cmdlet validates a potential replication partnership. The cmdlet:
● Measures bandwidth and round trip latency
● Estimates initial sync time
● Verifies that source and destination volumes exist
● Verifies that there is sufficient physical memory to run replication
NOTE: The file server feature has to be enabled on the nodes to run this cmdlet.
Keep the generated report for future reference.
For more information about this cmdlet, see Test-SRTopology.
Creating a stretched cluster
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