---
title: "Limits and Quotas - Block Storage"
description: "Exoscale Block Storage limits and quotas, including volume counts, sizes, IOPS, bandwidth, attachment rules, and availability."
url: https://community.exoscale.com/product/storage/block-storage/service-boundaries/limits-and-quotas/
product: "Block Storage"
section: product
last_updated: 2026-09-14
---
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# Limits and Quotas - Block Storage

## Limits


The following table shows which limits are enforced on Block Storage usage.
It also highlights some of the characteristics of the product:

| Usage | Limit |
| :------ | :------ |
| Maximum number of volumes attached to an instance | 5 |
| Maximum number of snapshot per volume | 20 |
| Maximum volume size | 10 TiB |
| Minimum volume size | 1 GiB |
| Maximum read IOPS per volume | 5K |
| Maximum write IOPS per volume | 5K |
| Maximum bandwidth per volume | 200 MiB/s |
| Minimum instance size to attach a volume | Small |
| Supported service offerings | All |
| Block storage durability on snapshot guarantee | Full durability of data only when the volume is snapshotted |



> [!NOTE]
> As block storage volumes expose a block size of 4KiB, some software that incorrectly assume a smaller block size might not work.
> This issue can be circumvented by using a compatibility layer in your instance like [dm-ebs](https://docs.kernel.org/admin-guide/device-mapper/dm-ebs.html) on linux.


## Quotas


The default Organization Quotas are set and can be expanded upon request:

| Usage | Quota |
| :------ | :------: |
| Volumes per Organization | 1000 |
| Overall Provisioned Volume Size | 20 TiB |


## Availability
Block Storage is available in all zones.