---
title: "Monitor an SFS"
description: "See which instances use a TIR Shared File System, with their mount paths, and track how much of its space is used."
content_type: "how-to"
product: "tir-sfs"
platform: "TIR"
url: "/tir/tir-sfs/how-to/monitor-an-sfs/"
topic: ["monitor"]
---

# Monitor an SFS

Each SFS has two tabs that show how it is used: **Instances** lists the instances mounting it,
and **Monitoring** shows how full it is.

## Before you begin

You need an SFS in your project. See
[Create an SFS](/tir/tir-sfs/how-to/create-an-sfs/).

## See which instances use it

1. In **Manage Shared File-System**, select the SFS's row.
2. Select the **Instances** tab.

The tab lists the project's instances with their **Name**, **Image**, **Node Status**, **Mount
Status**, **Mount Path**, and **Actions**. Use it to see which instances mount this SFS, at what
path, and to mount or unmount it on an instance. Keep the SFS mounted only on the instances that
need access, and unmount it from the rest. See
[Mount an SFS on an instance](/tir/tir-sfs/how-to/mount-an-sfs-on-an-instance/).

## Track its space

Select the **Monitoring** tab. **Shared File-System Usage** charts the space used on the SFS against
its total size. Use it to see when an SFS is getting full, before an instance runs out
of room to write.

When an SFS is close to its total size, increase it; see
[Increase the size of an SFS](/tir/tir-sfs/how-to/increase-the-size-of-an-sfs/).