Prerequisites
Each Mayastor Node (MSN), that is each cluster worker node which will host an instance of a Mayastor pod, must have these resources free and available for use by Mayastor:
Two x86-64 CPU cores with SSE4.2 instruction support:
Intel Nehalem processor (march=nehalem) and newer
AMD Bulldozer processor and newer
4GiB of RAM
HugePage support
A minimum of 1GiB of 2MiB-sized huge pages
Instances of the Mayastor pod must be run in privileged mode
As long as the resource prerequisites are met, Mayastor can deployed to a cluster with just a single worker node. However note that in order to evaluate the synchronous replication feature (N+1 mirroring), the number of worker nodes to which Mayastor is deployed should be no less than the desired replication factor. E.g. three-way mirroring of Persistent Volumes (PV) would require Mayastor to be deployed to a minimum of three worker nodes.
Mayastor supports the export and mounting of a Persistent Volume over either NVMe-oF TCP or iSCSI (configured as a parameter of the PV's underlying StorageClass). Worker node(s) on which a PV is to be mounted must have the requisite initiator support installed and configured for the protocol in use.
The iSCSI client should be installed and correctly configured as per this guide.
In order to reliably mount application PVs over NVMe-oF TCP, a worker node's kernel version must be 5.3 or later. Verify that the nvme-tcp module is loaded and if necessary, load it.
