Administrator Guide

VMware vSphere and Live Volume
57 Dell EMC SC Series: Synchronous Replication and Live Volume | CML1064
8.9.2 vMSC non-uniform storage presentation
Non-uniform means that each vSphere Metro Storage Cluster host will access a Live Volume through one
array or the other, but not both. Each cluster node has read/write access to either the primary or the
secondary Live Volume, but not both simultaneously. For the cluster nodes with access to the primary Live
Volume, their front-end I/O remains local in proximity. For the cluster nodes with access to the secondary Live
Volume, their front-end I/O is proxied to the primary Live Volume using the replication link. Implementing
Round Robin with non-uniform presentation is typically preferred to provide automated port and fabric balance
but fixed paths may also be used. Automatic role swap would be preferred with non-uniform storage
presentation so that a role swap will automatically follow the vMotion of virtual machines between sites.
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Tiebreaker
site
vSphere Stretched Cluster
Site 1 Site 2
Live Volume
VMFS datastores or RDM
TCP/IPTCP/IP
Fibre Channel
or iSCSI
Fibre Channel
or iSCSI
Fibre Channel
or iSCSI
SC Series
array
SC Series
array
High Availability
Primary Secondary
PrimarySecondary
Non-uniform
Synchronous High
Availability replication
vMSC non-uniform storage presentation