The following two ways can be used to add capacity to VSP One SDS Block as follows.
Adding storage node
By adding storage nodes to the storage cluster, increase the total capacity of the storage cluster.
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Advantage: Adding storage nodes might improve the performance of a storage cluster, depending on the IO pattern.
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Disadvantage: It costs more than the case of adding drives. (Hardware cost, installation cost, and others)
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Disadvantages: (Bare metal) If there is only one fault domain, drive data relocation is performed. As a result, it takes some time before the added capacity becomes available.
Adding drives
By adding drives to the existing storage nodes, increase the total capacity of the storage cluster.
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Advantage: It costs less than the case of adding nodes because it only needs installation cost of drives.
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Disadvantage: The number of drives for storage node is limited.