---
title: "Parallel File System"
description: "TIR Parallel File System is Delhi-only storage you create once and mount on instances or training clusters for fast, shared, parallel access."
content_type: "overview"
product: "tir-pfs"
platform: "TIR"
url: "/tir/tir-pfs/"
---

# Parallel File System

Parallel File System (PFS) is fast shared storage that you create once and mount on instances,
training clusters, and Slurm clusters. Many workers can then read and write it at the same time.

TIR also offers [Shared File System](/tir/tir-sfs/) (SFS), shared storage you mount the same way.
SFS suits shared access from many instances at once, such as a shared workspace. PFS suits
parallel reads and writes at high throughput, such as training across many instances. For how the
two compare in size, region, and bandwidth, see
[What is the difference between a PFS and an SFS?](/tir/tir-pfs/faq/#what-is-the-difference-between-a-pfs-and-an-sfs).

## Where to find it

In TIR, open your project. In the side menu, under **Storage**, select **Parallel File System**,
which sits after **Shared File System**.

## What you can do

### Create and connect

- [Create a PFS](/tir/tir-pfs/how-to/create-a-pfs/) with a name and a size in TB.
- [Mount a PFS on an instance](/tir/tir-pfs/how-to/mount-a-pfs-on-an-instance/), at creation or
  afterward.
- [Mount a PFS on a training cluster](/tir/tir-pfs/how-to/mount-a-pfs-on-a-training-cluster/) or a
  Slurm cluster.

### Lifecycle

- [Increase the size of a PFS](/tir/tir-pfs/how-to/increase-the-size-of-a-pfs/) when you need more
  space.
- [Delete a PFS](/tir/tir-pfs/how-to/delete-a-pfs/) when you have finished with it.

### Monitor

- [See what uses a PFS](/tir/tir-pfs/how-to/see-what-uses-a-pfs/): the instances, training clusters,
  and Slurm clusters that have it mounted.

## Where to start

Start with [Get started with TIR Parallel File System](/tir/tir-pfs/get-started/), which creates a PFS
and mounts it on an instance. Short answers are in the
[TIR Parallel File System FAQ](/tir/tir-pfs/faq/), and help with each message is in
[Troubleshooting TIR Parallel File System](/tir/tir-pfs/troubleshooting/tir-pfs/).