[[["易于理解","easyToUnderstand","thumb-up"],["解决了我的问题","solvedMyProblem","thumb-up"],["其他","otherUp","thumb-up"]],[["很难理解","hardToUnderstand","thumb-down"],["信息或示例代码不正确","incorrectInformationOrSampleCode","thumb-down"],["没有我需要的信息/示例","missingTheInformationSamplesINeed","thumb-down"],["翻译问题","translationIssue","thumb-down"],["其他","otherDown","thumb-down"]],["最后更新时间 (UTC)：2025-08-18。"],[],[],null,["# Storage classes\n\nThis page explains the concept of *storage class* and the differences between\nstorage classes.\n\n- To learn how to change the storage class of an object, see\n [Changing object storage classes](/storage/docs/changing-storage-classes).\n\n- To learn how to change a bucket's default storage class, see\n [Changing the default storage class](/storage/docs/changing-default-storage-class).\n\nKey concepts\n------------\n\n- A *storage class* is a piece of [metadata](/storage/docs/metadata) that is used by every object.\n\n- The storage class set for an object affects the object's availability\n and [pricing model](/storage/pricing).\n\n- When you [create a bucket](/storage/docs/creating-buckets), you can specify a *default storage class*\n for the bucket. When you add objects to the bucket, they inherit this storage\n class unless explicitly set otherwise.\n\n - If you don't specify a default storage class when you create a bucket,\n that bucket's default storage class is set to Standard storage.\n\n - [Changing the default storage class of a bucket](/storage/docs/changing-default-storage-class) does not affect any\n of the objects that already exist in the bucket.\n\n- You can change the storage class of an existing object either by\n [rewriting the object](/storage/docs/changing-storage-classes) or by using [Object Lifecycle Management](/storage/docs/lifecycle).\n\n- You can enable the [Autoclass](/storage/docs/autoclass) feature on a bucket to let\n Cloud Storage manage storage class transitions for you\n automatically.\n\nAvailable storage classes\n-------------------------\n\nThe following table summarizes the primary storage classes offered by\nCloud Storage. See [class descriptions](#descriptions) for a complete\ndiscussion.\n\n^1^See the [class descriptions](#descriptions) for the *availability\nSLA* for each storage class.\n\nClass descriptions\n------------------\n\nThe following features apply to all storage classes:\n\n- Unlimited storage with unlimited access.\n- No minimum object size.\n- Worldwide accessibility and worldwide [storage locations](/storage/docs/locations).\n- Low latency with no offline data retrieval.\n- [High durability](/storage/docs/availability-durability#key-concepts) (99.999999999% annual durability).\n- [Redundancy across regions](/storage/docs/availability-durability#cross-region-redundancy) when data is stored in a multi-region or dual-region.\n- A uniform experience with Cloud Storage features, security, tools, and APIs.\n\n### Standard storage\n\nStandard storage is best for data that is frequently accessed (\"hot\" data),\nas well as data that is stored for only brief periods of time.\n\nWhen used in a region, Standard storage is appropriate for storing data in\nthe same location as [Google Kubernetes Engine clusters](/kubernetes-engine/docs/clusters) or\n[Compute Engine instances](/compute/docs/instances) that use the data. Co-locating your resources\nmaximizes the performance for data-intensive computations and can reduce\nnetwork charges.\n\nWhen used in a dual-region, you still get optimized performance when accessing\nGoogle Cloud products that are located in one of the associated regions, but\nyou also get the improved availability that comes from storing data in\ngeographically separate locations.\n\nWhen used in a multi-region, Standard storage is appropriate for storing data\nthat is accessed around the world, such as serving website content, streaming\nvideos, executing interactive workloads, or serving data supporting mobile and\ngaming applications.\n\n#### Availability\n\nThe availability of Standard storage data is:\n\n^1^The availability SLA is the monthly uptime percentage backed by\nthe [Cloud Storage SLA](/storage/sla). If Google fails to meet that uptime,\ncustomers are eligible to receive a credit as described in the\nCloud Storage SLA.\n\n### Nearline storage\n\nNearline storage is a low-cost, highly durable storage service for storing\ninfrequently accessed data. Nearline storage is a better choice than\nStandard storage in scenarios where slightly lower availability, a 30-day\nminimum storage duration, and costs for data access are acceptable trade-offs\nfor lowered [at-rest storage costs](/storage/pricing#storage-pricing).\n\nNearline storage is ideal for data you plan to read or modify on average once\nper month or less. For example, if you want to continuously add files to\nCloud Storage and plan to access those files once a month for\nanalysis, Nearline storage is a great choice.\n\nNearline storage is also appropriate for data backup, long-tail multimedia\ncontent, and data archiving. Note, however, that for data accessed less\nfrequently than once a quarter, Coldline storage or Archive storage are more\ncost-effective, as they offer lower storage costs.\n\n#### Availability\n\nThe availability of Nearline storage data is:\n\n^1^The availability SLA is the monthly uptime percentage backed by\nthe [Cloud Storage SLA](/storage/sla). If Google fails to meet that uptime,\ncustomers are eligible to receive a credit as described in the\nCloud Storage SLA.\n\n### Coldline storage\n\nColdline storage is a very-low-cost, highly durable storage service for\nstoring infrequently accessed data. Coldline storage is a better choice than\nStandard storage or Nearline storage in scenarios where slightly lower\navailability, a 90-day minimum storage duration, and higher costs for data\naccess are acceptable trade-offs for lowered [at-rest storage costs](/storage/pricing#storage-pricing).\n\nColdline storage is ideal for data you plan to read or modify at most once a\nquarter. Note, however, that for data being kept entirely for backup or\narchiving purposes, Archive storage is more cost-effective, as it offers the\nlowest storage costs.\n\n#### Availability\n\nThe availability of Coldline storage data is:\n\n^1^The availability SLA is the monthly uptime percentage backed by\nthe [Cloud Storage SLA](/storage/sla). If Google fails to meet that uptime,\ncustomers are eligible to receive a credit as described in the\nCloud Storage SLA.\n\n### Archive storage\n\nArchive storage is the lowest-cost, highly durable storage service for data\narchiving, online backup, and disaster recovery. Unlike the \"coldest\" storage\nservices offered by other Cloud providers, your data is available within\nmilliseconds, not hours or days.\n\nLike Nearline storage and Coldline storage, Archive storage has a slightly\nlower availability than Standard storage. Archive storage also has higher\ncosts for data access and operations, as well as a 365-day minimum storage\nduration. Archive storage is the best choice for data that you plan to access\nless than once a year. For example:\n\n- Cold data storage - Archived data, such as data stored for legal\n or regulatory reasons, can be stored at low cost as Archive storage, yet\n still be available if you need it.\n\n- Disaster recovery - In the event of a disaster recovery event, recovery\n time is key. Cloud Storage provides low latency access to data stored as\n Archive storage.\n\n#### Availability\n\nThe availability of Archive storage data is:\n\n^1^The availability SLA is the monthly uptime percentage backed by\nthe [Cloud Storage SLA](/storage/sla). If Google fails to meet that uptime,\ncustomers are eligible to receive a credit as described in the\nCloud Storage SLA.\n\n### Additional classes\n\nCloud Storage supports several additional legacy storage classes;\nhowever, these legacy classes cannot be set using the Google Cloud console.\nUnless you already are using one of these legacy classes, you should use\nStandard storage instead.\n\n- **Multi-Regional storage** : Equivalent to Standard storage, except\n Multi-Regional storage can only be used for objects stored in\n [multi-regions](/storage/docs/locations#location-mr) or [dual-regions](/storage/docs/locations#location-dr).\n\n- **Regional storage** : Equivalent to Standard storage, except\n Regional storage can only be used for objects stored in [regions](/storage/docs/locations#location-r).\n\n- **Durable Reduced Availability (DRA) storage**: Similar to Standard storage except:\n\n - DRA has higher pricing for operations.\n - DRA has lower performance, particularly in terms of availability (DRA has a 99% availability SLA).\n\n You can move your data from DRA to other storage classes by\n [performing a storage transfer](/storage-transfer/docs/create-manage-transfer-console).\n\n| **Note:** When [enabling Autoclass on your bucket](/storage/docs/autoclass#autoclass_for_existing_buckets), legacy storage classes are considered to be different from Standard storage. For example, objects in your bucket other than soft-deleted objects transition to Standard storage when Autoclass is enabled, and this includes objects stored in legacy classes.\n\nPricing\n-------\n\nStorage classes affect the pricing model of objects and the operations you\nperform. For information about how storage classes affect pricing, see\n[Cloud Storage pricing](/storage/pricing).\n\nWhat's next\n-----------\n\n- [Create a Cloud Storage bucket](/storage/docs/creating-buckets).\n- [Compare storage costs for different storage classes](/storage/pricing#storage-pricing).\n- [Upload an object to Cloud Storage](/storage/docs/uploading-objects).\n- [Change the storage class of an individual object](/storage/docs/changing-storage-classes).\n- [Learn about the Object Lifecycle Management feature](/storage/docs/lifecycle).\n\nTry it for yourself\n-------------------\n\n\nIf you're new to Google Cloud, create an account to evaluate how\nCloud Storage performs in real-world\nscenarios. New customers also get $300 in free credits to run, test, and\ndeploy workloads.\n[Try Cloud Storage free](https://console.cloud.google.com/freetrial)"]]
