How to add Shadow device in existing nodes?

Hi, I have configured my cluser with 4 nodes on GCP, having namespace device as local SSD. Currently, there are around 10GB worth of data in each node and having Secondary Index. I wanted to know how would I add an additional persistent disk as shadow device to each node ? do I just need to add

namespace some_name {
…
  storage-engine device {
    device /dev/local_ssd
  }
}

to

namespace some_name {
…
  storage-engine device {
    device /dev/local_ssd /dev/persistent_disk
  }
}

and restart using service aerospike restart ?

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