Prerequisites for Distributed Storages

The following prerequisites are needed to setup Distributed Storages as a storage target in Commvault software:

Hedvig Storage Servers	Hedvig software version 3.9.9.9. Hedvig software is supported on CentOS 7.x and RHEL 7.x. Install the minimal version (7.7, as of this Hedvig release) of the CentOS on the storage nodes. RHEL requires a valid subscription to RHEL server repositories.
MediaAgent / Hedvig Proxy(s)	The MediaAgent software and the proxy must reside on the same computer. Commvault V11 with Feature Release 19 (or above). Hedvig software version 3.9.9.9 Hedvig software is supported on CentOS 7.x and RHEL 7.x. Install the minimal version (7.7, as of this Hedvig release) of the CentOS on the storage nodes. RHEL requires a valid subscription to RHEL server repositories. Note Minimum deployment should include 3 nodes for storage access, and at least 2 proxies for fault tolerance.
Hedvig Deployment Server	An esx/hyperv/kvm for importing the OVA file to create the deployment VM. An Ansible Configuration File. There are sample Ansible files in /`opt/hedvig/samples` on the Hedvig Deployment Server (after extracting `hedvig_extract.bin`). Contact Commvault to get an Ansible Configuration File customized for your environment.
CommServe Version	Commvault V11 with Service Pack 18 and Hot Fix Pack 5 (or a more recent version).
Password Requirements	Root password is required to deploy both the Hedvig Storage nodes and the Hedvig Proxies.
Network Requirements	All the Hedvig Storage Nodes and the MediaAgents / Proxies must have static IP addresses, and the mapping from IP to hostname be updated in `/etc/hosts` even if DNS resolution is available. Storage proxies are configured with 2 ethernet interfaces and run as an HA pair (except for storage proxies that are used for object storage). For failover to work correctly, a public VIP address and a private VIP address are required for the ethernet interfaces.