This topic provides answers to some frequently asked questions about PolarDB storage plans.

Purchase and usage

  • Do I need to purchase a storage plan after I purchase a cluster?

    No, you do not need to purchase a storage plan after you purchase a cluster. You can purchase storage plans based on your business requirements. After you purchase a storage plan, the storage plan is automatically applied to clusters in the same region. For more information, see Together with storage plans.

  • The storage capacity of a storage plan is 3 TB or 5 TB. If my services require 4 TB of storage, which storage plan do I purchase?

    We recommend that you first purchase a 3-TB storage plan. If the amount of the stored data increases to approximately 5 TB, we recommend that you upgrade the storage plan to a 5-TB storage plan. For more information, see Upgrade a storage plan.

Supported clusters

  • Can multiple clusters share a storage plan?

    Yes, a storage plan can be shared by all clusters in the regions that are specified by the Plan Type parameter. You can set Plan Type to Mainland China or China (Hong Kong) and regions outside China. For more information, see Purchase a storage plan.

  • Can the clusters that use different engines share a storage plan?

    Yes, clusters that use different engines can share a storage plan. A storage plan can be shared by PolarDB for MySQL, PolarDB for PostgreSQL, and PolarDB-O clusters.

Eligibility

  • Are storage plans used to offset only storage fees?
    Storage plans can be used to offset the following fees:
  • Are storage plans applied to different resources in an order? Can I apply a storage plan to clusters first?

    A storage plan is first applied to PolarDB clusters. Then, the remaining capacity of the storage plan is automatically used to offset the storage that exceeds the free quota for level-1 backups.

  • What is the offset ratio when I use a storage plan to offset the storage of level-1 backups?

    The ratio is 1:1.6. In this case, every 1 GB of the storage plan is used to offset 1.6 GB of level-1 backup storage. For example, you purchase a storage plan of 100 GB in size. After you apply the storage plan, 50 GB is left in the storage plan. Level-1 backups consume 50 GB of storage, which exceeds the free quota. In this case, 31.25 GB (50/1.6 = 31.25) of the storage plan is automatically used to offset the overage of the level-1 backups. After the storage plan is applied to the level-1 backups, 18.75 GB is left in the storage plan.

Renewal and upgrade

  • What can I do if the storage capacity of my storage plan is insufficient or exhausted? Can I purchase another storage plan of the same type?

    No, you cannot purchase another storage plan of the same type. You can purchase only one storage plan of each type. If the storage capacity of your storage plan is insufficient or is exhausted, you can upgrade the storage plan. For more information, see Renew or upgrade a storage plan.

  • How am I charged for the storage that exceeds the storage capacity of my storage plan?

    You are charged for the storage that exceeds the storage capacity of your storage plan based on the pay-as-you-go billing method. For more information, see Storage pricing.

  • How can I renew my storage plan if the storage plan is due to expire?

    You can renew your storage plan in the user center. For more information, see Renew a storage plan.

  • What do I do if the storage capacity of a storage plan is insufficient to offset the storage of level-1 backups that exceeds the free quota?

    If the remaining capacity of the storage plan is insufficient to offset the storage of level-1 backups, the overage is charged on a pay-as-you-go basis. You can also upgrade the storage plan. For more information, see Upgrade a storage plan.