Administrator Guide

Live Volume support for Microsoft Windows/Hyper-V
76 Dell EMC SC Series: Synchronous Replication and Live Volume | CML1064
If Live Volume automatic role swap is enabled, the VM placement and workload determines which array will
own the primary Live Volume, since the Live Volume will follow the workload, based on the auto-swap
thresholds. The scenario in Figure 66 depicts a virtual machine that is live migrated from Host A to Host B.
The secondary SC Series array will proxy I/O to the primary array for short time and then automatically swap
the primary Live Volume role from the primary array to the secondary array.
Non-uniform server access and Live Volume role swap
9.8 SCVMM/SCCM and Performance and Resource Optimization (PRO)
Microsoft System Center Virtual Machine Manager (SCVMM) with System Center Configuration Manager is
capable of providing intelligent placement as well as automatic migrations of virtual machines from highly
utilized nodes to lower utilized nodes, depending on the action setting of Automatic or Manual. If using Live
Volume in a multi-site Hyper-V cluster with Performance and Resource Optimization (PRO) where there are
latency and bandwidth limitations for secondary data paths, use the Manual action for virtual machine
placement.
In a multi-site Live Volume Hyper-V cluster, the virtual machines will typically be kept running on nodes within
the same site as their respective primary Live Volume(s). If PRO is activated on a Hyper-V cluster with nodes
in each site, it could automatically migrate some of the virtual machines running on Cluster Shared Volumes
(CSVs) that are also Live Volumes to a node that resides in the other data center, thereby splitting the I/O
between data centers.
9.9 Live Volume and Cluster Shared Volumes
The Hyper-V Cluster Shared Volume (CSV) feature allows administrators to place multiple virtual machines
on the volume in a way that VMs on different nodes can all have read and write access to the same volume
concurrently. CSVs also have a resiliency feature called network redirection that by design makes Hyper-V
cluster data access more fault tolerant. If the CSV is owned by a node in the cluster that has access to the
volume, it can redirect data access to that volume through the network to another node that has lost access to
that volume.