System Requirements for Live Sync I/O

early release

This topic summarizes requirements for Live Sync I/O.

To avoid delays in replication, implement the following best practices:

  • Use a low latency network.
  • Provide enough cache space and a fast storage connection to the cache on the VSA proxy at the source site.
  • Provide a fast storage connection to the RP Store.
  • Provide enough storage for the RP Store.
  • Timestamps must be synchronized between VSA proxies and ESXi hosts.

Hypervisor Support

vCenter and ESXi Requirements

  • vCenter Server version: 6.5
  • ESXi memory requirement for each VM: 100MB
  • On the ESX cluster, vSphere High Availability (vSphere HA) must be configured and vSphere Distributed Resource Scheduler (DRS) must be enabled.


  • Two VSA Proxies: One at the source site and one at the destination site.
  • MediaAgent should be present on the destination proxy.
  • Low latency network between the proxies, preferably 10 Gigabit Ethernet, depending upon I/O loads.
  • The destination requires a fast storage connection to the Recovery Point Store (RP Store).

Virtual Machine Disks

Before configuring a source VM for Live Sync I/O, ensure that the VM storage policy in vSphere is set to Datastore Default for all disks.

Proxy Computer Operating Systems

  • Microsoft Windows Server 2016
  • Microsoft Windows Server 2012 R2 x64 Editions
  • Microsoft Windows Server 2012 x64 Editions
  • Microsoft Windows Server 2008 R2 x64 Editions

Note: Linux proxies are not supported.

Plug-In Installation or Upgrade Requirements

VMware vCenter Server Privileges

  • Ensure that vCenter permissions are configured correctly as described in Permissions for Custom User Accounts.
  • The VMware vCenter Server user account used to install plug-ins must have administrator privileges for installation or upgrade.

Acceptance Level

  • For each ESX host, ensure that the acceptance level is CommunitySupported. Other acceptance levels are not supported.

Licenses and Features Enabled

  • During installation or upgrade of the Commvault plug-in, ESX servers go into maintenance mode, which requires that vSphere High Availability (vSphere HA) is configured and vSphere Distributed Resource Scheduler (DRS) is enabled.
  • Plug-ins must be part of protected and replicated data centers (ESX clusters).

Source Proxy Cache Requirement

  • Cache location: Job Results directory

Network Bandwidth

Provide network bandwidth based on the estimated I/O speed. For example:

  • Protected VMs: 10
  • Rate at which each VM performs I/O: 100 MB/s
  • Preferred Network Speed: 1000 MB/s

Preferred Recovery Point Store (RP Store) Requirement

Size the RP Store based on I/O throughput and RP Retention criteria. For example:

  • RP Store I/O throughput: 100 MB/s
  • Total Retention Time (hours): 5 Hrs
  • RP Store size: 1800000 MB (1.72 TB)

Firewall Port Requirements

For environments that include a firewall, open the following ports:

  • For ESXi servers on the source site, open port 38403.
  • For ESXi servers on the destination site, open port 38404.

These ports are used by the BLR service to communicate with VAIO daemons.

Last modified: 5/17/2019 7:26:40 PM