# How to add Shadow device in existing nodes?

**URL:** <https://discuss.aerospike.com/t/how-to-add-shadow-device-in-existing-nodes/7865>\
**Category:** Configuration\
**Created:** [September 23, 2020, 10:12pm UTC](https://discuss.aerospike.com/t/how-to-add-shadow-device-in-existing-nodes/7865 "2020-09-23T22:12:19Z")\
**Posts on this page:** 1\
**Page:** 1

<div class="post-metadata">

**Author:** ![letiba4730](https://avatars.discourse-cdn.com/v4/letter/l/8491ac/32.png) [@letiba4730](https://discuss.aerospike.com/u/letiba4730)\
**Post date:** [September 23, 2020, 10:12pm UTC](https://discuss.aerospike.com/t/how-to-add-shadow-device-in-existing-nodes/7865/1 "2020-09-23T22:12:19Z")

</div>

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

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

```

to

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

```

and restart using `service aerospike restart` ?