---
title: "See what uses a PFS"
description: "Check which instances, training cluster deployments, and Slurm clusters have a TIR Parallel File System mounted."
content_type: "how-to"
product: "tir-pfs"
platform: "TIR"
url: "/tir/tir-pfs/how-to/see-what-uses-a-pfs/"
topic: ["monitor"]
relationships: {"requires":["/tir/tir-pfs/how-to/create-a-pfs/"]}
---

# See what uses a PFS

See what has a Parallel File System (PFS) mounted before you unmount, increase its size, or
delete it. The same check confirms the right instances are reading from it.

## Before you begin

You need a PFS created in the project. See
[Create a PFS](/tir/tir-pfs/how-to/create-a-pfs/).

## See what is using it

1. In **Parallel File System**, select the PFS's row. Its **Services** tab opens below the list.
2. Choose what to see from the tab's dropdown: **Instances**, **Training Cluster Deployments**,
   or **Slurm Cluster**. The tab lists one kind at a time.

To see another PFS's services, select its row instead.

A PFS belongs to one project. **Parallel File System** lists the current project's PFS, and the
**Services** tab shows that project's instances, training clusters, and Slurm clusters. A
training cluster's own **Volumes** tab lists its mounted PFS the same way, and you can filter it to
mounted or unmounted; see
[Mount a PFS on a training cluster](/tir/tir-pfs/how-to/mount-a-pfs-on-a-training-cluster/).

Before you delete a PFS, unmount it from everything on the list; see
[Delete a PFS](/tir/tir-pfs/how-to/delete-a-pfs/). An increase works while the PFS stays mounted;
see [Increase the size of a PFS](/tir/tir-pfs/how-to/increase-the-size-of-a-pfs/).