PowerScale OneFS Supportability and Compatibility Guide

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Node Pool Compatibility

Node pool compatibility enables deployment of a newer generation node to a SmartPools node pool that contains nodes from an earlier generation.

If the nodes are compatible, you can join a newer generation node to an existing cluster of earlier generation nodes. The newer generation node becomes a member of an existing node pool.

For node pool compatibility the following requirements must be met:

The newer-generation node must have the same node series as the earlier-generation node (S, X, A, or F).
The newer-generation node must have the same number and layout of HDDs, SEDs, and SSDs as the earlier-generation node.
The newer-generation node must have compatible RAM with the earlier-generation node.

Table 1. Node Pool RAM CompatibilityThis table displays Node Pool RAM Compatibility.
Earlier-Generation RAM	Newer-Generation RAM
A200 16 GB	A2000 16 GB
A200 64 GB	A2000 64 GB
F200 48 GB	F210 128 GB
F200 96 GB	F210 128 GB
X200 06 GB	X210 24 GB
X200 12 GB	X210 24 GB
X200 24 GB	X210 24 GB
X200 48 GB	X210 48 GB

NOTE:Nodes with SSDs require that L3 cache is enabled on all nodes in the node pool. L3 cache can only be enabled on nodes that have fewer than 16 SSDs and at least a 2:1 ratio of HDDs to SSDs. If SSDs are used for storage, then SSD counts must be identical on all nodes in a node pool or performance might be impacted.