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Chapter 2. Support Requirements
This chapter outlines the requirements for creating a supported integration of Red Hat Gluster Storage and Red Hat Virtualization.
2.1. Prerequisites
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Integrating Red Hat Gluster Storage with Red Hat Virtualization has the following requirements:
- All installations of Red Hat Virtualization and Red Hat Gluster Storage must have valid subscriptions to Red Hat Network channels and Subscription Management repositories.
- Red Hat Virtualization installations must adhere to the requirements laid out in the Red Hat Virtualization Installation Guide: https://access.redhat.com/documentation/en-us/red_hat_virtualization/4.2/html/installation_guide/index.
- Red Hat Gluster Storage installations must adhere to the requirements laid out in the Red Hat Gluster Storage Installation Guide: https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.4/html/installation_guide/chap-planning_red_hat_storage_installation.
- Red Hat Gluster Storage installations must be completely up to date with the latest patches and upgrades. Refer to the Red Hat Gluster Storage 3.4 Installation Guide to upgrade to the latest version: https://access.redhat.com/documentation/en-us/red_hat_gluster_storage/3.4/html/installation_guide/.
- The versions of Red Hat Virtualization and Red Hat Gluster Storage integrated must be compatible, according to the table in Section 2.2, “Compatible Versions”.
- A fully-qualified domain name must be set for each hypervisor and Red Hat Gluster Storage server node. Ensure that correct DNS records exist, and that the fully-qualified domain name is resolvable via both forward and reverse DNS lookup.
- Red Hat Gluster Storage volumes must either use three-way replication or arbitrated replication. This reduces the risk of split-brain condition developing in the cluster. The following volume types are supported:
- arbitrated replicated or distributed arbitrated replicated volumes (
replica 3 arbiter 1)
- Server-side quorum, client-side quorum, and sharding are all required for a supported configuration. These are enabled by default in the
virttuning profile covered in Chapter 4, Hosting Virtual Machine Images on Red Hat Gluster Storage volumes. See Preventing Split-brain for information about how quorum settings help prevent split brain. See Creating Sharded Volumes for information about why sharding reduces heal and geo-replication time.
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