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If you intend to create space-optimized instant snapshots that share a cache volume, the region size that you specify for the volume must be greater than or equal to any region size that you specify for the cache volume. Creation of space-optimized snapshots that use a shared cache fails if the region size of the volume is smaller than the region size of the cache.
If the region size of a space-optimized snapshot differs from the region size of the cache, this can degrade the system's performance compared to the case where the region sizes are the same.
If you need to create several space-optimized instant snapshots for the volumes in a disk group, you may find it more convenient to create a single shared cache volume in the disk group rather than a separate cache volume for each snapshot.