All Products
Search

This Product

    Cloud Parallel File Storage:Scale out a file system

    Document Center

    Cloud Parallel File Storage:Scale out a file system

    Last Updated:Sep 21, 2026

    The capacity you specify when creating a CPFS for Lingjun file system is its maximum limit. If a file system becomes full, you cannot write new data. To prevent write failures from disrupting your services, we recommend scaling out the file system's capacity before it is full.

    Prerequisites

    You have created a file system. For more information, see Create a file system.

    Precautions

    • A CPFS for Lingjun file system must be in the Running state to be scaled out.

    • CPFS for Lingjun file systems support only scale-out, not scale-in. The scaling step size is 10,240 GiB, and you can scale out the capacity up to 1 PiB. You can create a file system with a capacity of up to 20 PiB. To create a file system of this size, submit a ticket.

    • High file system usage can cause performance degradation due to file fragmentation. We recommend scaling out the file system before its capacity usage reaches 90%.

    • For optimal performance, we recommend performing data rebalancing after a scale-out. This process consumes disk and network bandwidth and may cause a temporary performance decrease. To use this feature, submit a ticket.

      • The time required for data rebalancing depends on the amount of existing data and can be lengthy for large volumes.

      • In cases of extreme data imbalance, the df command and the NAS console might show a temporary decrease in total capacity and used space, but this does not affect data security or access performance.

      • If you choose not to perform data rebalancing, I/O latency may increase as more data is written to the file system.

    Scale out CPFS for Lingjun

    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 a region.

    4. Find the target CPFS for Lingjun file system. In the Actions column, click the 3 icon and choose Upgrade.

      Note

      File systems support only scale-out, not scale-in. The scaling step size is 10,240 GiB, and you can scale out the capacity up to 1 PiB. You can create a file system with a capacity of up to 20 PiB. To create a file system of this size, submit a ticket.

    5. On the CPFS (Pay-As-You-Go) | Upgrade/Downgrade panel, in the Provisioned Capacity section, adjust the capacity.

      Note

      To ensure stable performance after a scale-out, we recommend increasing the total capacity by at least 10%.

    6. Click Buy Now and complete the purchase as prompted.

    Related documents