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    File Storage NAS:Scale up an Extreme NAS file system

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    File Storage NAS:Scale up an Extreme NAS file system

    Last Updated:Jun 20, 2026

    The initial capacity of an Extreme NAS file system is its maximum usable capacity. If the file system becomes full, write operations fail. To prevent service disruptions from write failures, scale up the file system's capacity before it becomes full. This topic describes how to scale up an Extreme NAS file system.

    Prerequisites

    You have created an Extreme NAS file system. For more information, see Create an Extreme NAS file system in the console.

    Usage notes

    Take note of the following points when you scale up an Extreme NAS file system:

    • The file system must be in the Running state. Otherwise, you cannot scale it up.

    • The file system is unavailable for up to 90 seconds during the scale-up process. The entire operation can take from several minutes to hours to complete. Before the process finishes, the I/O performance might not meet the specified targets. We recommend scaling up during off-peak hours to minimize business impact.

    • You can scale up a file system, but you cannot scale it down.

    • Extreme NAS file systems created before May 20, 2020 are Version 1, and those created on or after this date are Version 2. You can call the DescribeFileSystems operation to check the version of your file system.

      Version 1 file systems support a maximum capacity of 32 TiB, and their bandwidth does not increase when you scale up. Version 2 file systems support up to 256 TiB, and both bandwidth and performance increase with capacity. For detailed performance metrics, see Specifications of Extreme NAS file systems.

      You cannot switch between versions. We recommend using Data Transport to migrate data to a Version 2 file system. For more information, see Migrate data between NAS file systems.

    • Do not scale up a file system while a snapshot is being created. You must first wait for the snapshot task to complete or cancel it. This is because the scale-up process creates its own snapshot for data protection.

    • When file system usage reaches a high watermark, increased file fragmentation can degrade performance. We recommend scaling up your file system before its usage reaches 90%.

    • To achieve optimal performance, Extreme NAS may automatically rebalance data during the scale-up process. This rebalancing can consume some disk and network bandwidth, leading to a temporary performance decrease. The extent and duration of this impact depend on the file system's data volume and I/O workload.

    Procedure

    1. Log on to the NAS console.

    2. In the left-side navigation pane, choose File System > File System List.

    3. In the top navigation bar, select the resource group and region where your file system resides.image

    4. Find the target file system, and in the Actions column, click Upgrade.

    5. In the Upgrade panel, in the Extreme Capacity Configuration section, slide the slider to adjust the capacity.

      You can set the capacity to a value from 100 GiB to 262,144 GiB. Important: An Extreme NAS file system is unavailable for up to 90 seconds during the scale-up process. We recommend performing this operation during off-peak hours.

    6. In the Terms of Service area, select the Terms of Service.

      • For a Pay-as-you-go file system, select I have read and agree to the Extreme NAS (Pay-as-you-go) Terms of Service.

      • For a Package Year file system, select Extreme NAS Terms of Service.

    7. Click Buy Now and follow the on-screen instructions to complete the purchase.

    References