Cloud Storage Gateway:Manage a file gateway in the CSG console

Step 1: Create a file gateway

1. Log on to the CSG console.

2. At the top of the page, select the region where you want to create a file gateway.

3. In the left-side navigation pane, click Gateways. On the page that appears, select a gateway cluster and click Create.

   If you do not have a gateway cluster, click Create Gateway Cluster on the Overview page to create a gateway cluster.

4. In the Gateway Information step, configure the parameters and click Next. The following table describes the parameters.

   Parameter	Description
   Name	The name of the file gateway that you want to create.
   Location	The location where you want to deploy the gateway. Valid values: On-premises and Alibaba Cloud. On-premises: The file gateway is deployed in your data center. You can deploy an on-premises file gateway in the CSG console or in the on-premises file gateway console. Alibaba Cloud: The file gateway is deployed on Alibaba Cloud. You can deploy a cloud file gateway only in the CSG console.
   Type	The type of the gateway that you want to create. Select File Gateway.

5. In the Gateway Configurations step, set the required parameters and click Next.

   If you set Location to Alibaba Cloud, you must set the gateway configuration parameters. The following table describes the parameters.

   Parameter	Description
   Edition	The gateway edition. Valid values: Basic, Standard, Enhanced, and Performance Optimized. For more information, see Specifications.
   VPC	The VPC in which you want to deploy the file gateway. Note The specified VPC must be the VPC in which your ECS instance or on-premises host resides.
   VSwitch	The vSwitch that is connected to the file gateway. Note The specified vSwitch must be the same vSwitch that is connected to your ECS instance or on-premises host. If no gateway resource is available in the zone where the specified vSwitch resides, create a vSwitch in another zone.
   Public Network Bandwidth	The public bandwidth. Note By default, Public Network Bandwidth is not selected. If you want to use a gateway that resides in another region or require express synchronization across regions, you must select and set the Public Network Bandwidth parameter. For more information, see Upgrade the public bandwidth. The allowed public bandwidth ranges from 6 Mbit/s to 200 Mbit/s.

6. In the Billing Information step, configure the parameters and click Next. The following table describes the parameters.

   Parameter	Description
   Billing Method	The billing method that you want to apply to the gateway. You can select Pay-as-you-go or Subscription. For more information, see Billable items and billing methods. If you select Subscription, you are redirected to the Cloud Storage Gateway (Subscription) page after you create the file gateway. Complete the payment. For more information, see Purchase a gateway.
   Expiration Policy	The expiration policy for the gateway. Valid values: Switch to Pay-as-you-go and Release.

7. In the Confirmation step, verify your settings and click OK.

   • If you create a cloud file gateway, the system completes the deployment in 5 to 10 minutes. If Running is displayed in the Status column, the gateway is activated and deployed.

   • If you create an on-premises file gateway, click Activate Gateway in the Actions column. In the Activate Gateway dialog box, set the required parameters to activate the gateway. For more information, see the Activate the gateway section of the "Deploy an on-premises console for a file gateway" topic.

Step 2: Add a cache disk

1. Log on to the CSG console.

2. At the top of the page, select the region where the file gateway resides.

3. In the left-side navigation pane, click Gateways. On the page that appears, locate the file gateway to which you want to add a cache disk and click the ID of the file gateway.

4. In the left-side navigation pane, click Cache. On the Cache page, click Create Cache.

5. In the Add Cache dialog box, configure the following parameters:

   • Capacity: the size of the cache disk that you want to create. Valid values: 40 GB to 32 TB.

   • Type: the type of the cache disk that you want to create. Valid values: Ultra Disk, Standard SSD, and ESSD.

   Note

   • Basic gateway: The maximum cache capacity is 1 TB. A Basic file gateway does not support PL3 ESSD cache disks.

   • Standard gateway: The maximum cache capacity is 2 TB.

6. Click OK.

   After you add a cache disk to a Subscription file gateway, you are redirected to the Cloud Storage Gateway (Subscription) page and need to complete the payment. For more information, see Purchase a cache disk.

Step 3: Create a share

1. Log on to the CSG console.

2. In the upper-left corner of the page, select the region where the destination file gateway resides.

3. In the left-side navigation pane, click Gateways. On the page that appears, locate the file gateway and click the ID of the file gateway.

4. In the left-side navigation pane, click Share. On the Shares page, click Create.

5. In the Bucket Settings step, configure the parameters and click Next. The following table describes the parameters.

   Parameter	Description
   Cross-border Binding	If you select Yes, you can access a bucket that resides in a different region from the gateway. If you select No, you can access only a bucket that resides in the same region as the gateway.
   OSS Endpoint	Select the endpoint of the region where the bucket resides.
   Bucket Name	You can select an existing bucket from the drop-down list. You can also select the Subdirectory check box and enter a subdirectory of the bucket in the text box that appears. The name of a subdirectory can contain only letters and digits. Note In version 1.0.38 and later, you can map the root directory of a file system to a subdirectory of the bucket. This way, you can isolate file access requests. You can specify an existing subdirectory or a subdirectory that does not exist in the bucket. After you create a share, the specified subdirectory serves as the root directory and stores all related files and directories. Back-to-origin buckets are not supported. CSG cannot guarantee that only one write operation is performed on an object. Therefore, buckets for which retention policies are configured are not supported.
   Encrypt	Specify whether to perform encryption. Valid values: None, Server-side Encryption, and Gateway-side Encryption. If you select Server-side Encryption, you must specify a Key ID. You can create a key in the Key Management Service (KMS) console. For more information, see Create a CMK. If you enable the server-side encryption feature in OSS, you can bring your own key (BYOK). You can use keys that are imported from KMS. After you enable server-side encryption, files that are uploaded to OSS from the share are encrypted by using KMS-managed keys. You can call the GetObject operation to check whether the specified file is encrypted. If the value of the x-oss-server-side-encryption field is KMS and the value of the x-oss-server-side-encryption-key-id field is the key ID in the response header, the file is encrypted. Note Only the users on the whitelist can use this feature. The gateway-side encryption feature is available only for enhanced and performance-optimized gateways. For more information, see Enable gateway encryption. When you create a key in the KMS console, you must select the region in which the OSS bucket resides.
   Use SSL to Connect Bucket	If you select Yes, the share is connected to the OSS bucket over SSL.

6. In the Basic Information tab, configure the parameters and click Next. The following table describes the parameters.

   Parameter	Description
   Share Name	The name of the NFS or SMB share that you want to create. If you set the Protocol parameter to NFS, the share name is also used as the virtual path of NFS version 4 (NFSv4). The name must be 1 to 32 characters in length, and can contain letters and digits. The name cannot start with a digit.
   Protocol	The protocol that you use to connect to the OSS bucket. Valid values: NFS and SMB. Use the NFS protocol if you need to access OSS buckets from Linux. Use the SMB protocol if you need to access OSS buckets from Windows.
   Cache	Select an existing cache disk. Note For a cache disk whose capacity is less than 5 TB, 20% of the space is used to store metadata. For a cache disk whose capacity is 5 TB or larger, 1 TB of the space is used to store metadata. For example, if you create a cache disk whose capacity is 40 GB, the available cache space for storing files is 32 GB. If you create a cache disk whose capacity is 20 TB, the available cache space for storing files is 19 TB.
   User Mapping	Maps an NFS client user to an NFS server user. This parameter is available only when you set Protocol to NFS. Valid values: none: NFS client users are not mapped to the nobody user on the NFS server. root_squash: NFS clients that use the root identity are mapped to the nobody user on the NFS server. all_squash: The NFS client is mapped to the nobody user on the NFS server regardless of the identity that the client uses. all_anonymous: The NFS client is mapped to the anonymous user on the NFS server regardless of the identity that the client uses.
   Archive	This parameter is available only if you set Protocol to NFS and User Mapping to none. If you select Yes, the archive feature is enabled. You can use the archive feature to archive and restore files in a share. If you select No, the archive feature is disabled. You cannot use the archive feature to manage files. When you read data from an archived file, a request to restore the file is also initiated. This can cause some latency before you can read the archived file. Note Basic file gateways do not support the archive feature.
   Browsable	Specifies whether the share can be accessed by using Network Neighborhood.
   Windows Permission Support	For more information, see Enable Windows access-based enumeration.
   Add to Sync Group	You can enable the express synchronization feature for the share and add the share to a synchronization group. Then, all changes made to the data stored in the associated OSS bucket are synchronized to the on-premises client of the share. When you select the Add to Sync Group check box, the Reverse Sync check box is automatically cleared. Note To enable this feature, create a synchronization group first. Make sure that the synchronization group and the share use the same OSS bucket. For more information about how to create a synchronization group, see Configure express synchronization. Only Standard, Enhanced, and Performance Optimized gateways support the express synchronization feature. The express synchronization feature is implemented based on Alibaba Cloud Message Service (MNS). Adding a share to a synchronization group incurs MNS costs. For more information about billing, see Configure express synchronization.
   Advanced Settings	After you select the Advanced Settings check box, the Advanced Settings step appears.

7. In the Advanced Settings step, configure the parameters, and then click Next. The following table describes the parameters.

   Parameter	Description
   Mode	Replication Mode: In this mode, two backups are created for all data. One backup is stored in the on-premises cache disk and the other backup is stored in the associated OSS bucket. Cache Mode: In this mode, the backup that is stored in the on-premises cache disk contains only metadata and the user data that is frequently accessed. The backup that is stored in the OSS bucket contains all data.
   Transfer Acceleration	This feature accelerates data transfer across regions by using the public bandwidth of the gateway. Before you use this feature, make sure that the transfer acceleration feature is enabled for the associated OSS bucket.
   Fragmentation Optimization	Specifies whether to optimize the performance for applications that frequently and randomly read and write small amounts of data.
   Direct IO Mode	Specifies whether to transfer data by using the direct I/O mechanism.
   Upload Optimization	If you select Yes, cached data is cleared in real time. This feature is suitable for cloud backup scenarios.
   Reverse Sync	Specifies whether to synchronize metadata of objects in the OSS bucket to the on-premises cache disk. This feature is suitable for disaster recovery, data restoration, and data sharing scenarios. Note During a reverse synchronization process, the system scans all objects in the bucket. If there are a large number of objects, you are charged for OSS API calls. For more information, see OSS pricing. If you select the Add to Sync Group check box in the Basic Information step, the Reverse Sync parameter is unavailable.
   Reverse Sync Interval	If you set Reverse Sync to Yes, you must set the Reverse Sync Interval parameter. Valid values: 15 to 36000. Default value: 36000. Unit: seconds. Note If the bucket contains a large number of objects, we recommend that you specify an interval that is greater than 3,600 seconds. If the interval is less than 3,600 seconds, repeated scans are performed, which results in frequent OSS API calls and consequently increased API request fees.
   Ignore Deletions	If you select Yes, the data that is deleted from the on-premises cache disk is not deleted from the OSS bucket. The backup that is stored in the OSS bucket contains all data.
   NFS V4 Optimization	Specifies whether to optimize the upload efficiency if an NFSv4 file system is mounted. If you select Yes, you cannot mount an NFSv3 file system.
   Sync Latency	Specifies a period of time for delaying the upload of files that you modified and closed. The Sync Latency feature prevents OSS file fragmentation that is caused by frequent on-premises modifications. Default value: 5. Maximum value: 120. Unit: seconds.
   Replication Mode Advanced Settings	This parameter is available only if you set Mode to Replication Mode. After you select the Replication Mode Advanced Settings check box, the Replication Mode Advanced Settings step appears.

8. In the Replication Mode Advanced Settings step, configure the parameters and then click Next. The following table describes the parameters.

   Parameter	Description
   Configure Directory in Replication Mode	Allows you to specify the files to which the replication mode applies. If you do not select this check box, the replication mode applies to all data in the share. After you select the check box, click Add Directory to specify a directory that contains the data to which you want to apply the replication mode. The replication mode is applied to data in the specified directory. The rest of the data uses the cache mode. Note If you change the mode of a directory from cache to replication, the files in the directory can be synchronized only when the data download feature is also enabled. We recommend that you enable the data download feature in replication mode. You can specify relative directories under the root directory of the share. For example, if the directory to which you want to apply the replication mode is /mnt/myshare/mydir/ and the mount point is /mnt/myshare, enter /mydir/.
   Data Download	By default, the reverse synchronization and express synchronization features synchronize the metadata between the OSS bucket and the on-premises cache disk. The data download feature allows you to download data from OSS to the local cache disk. After you enable the Reverse Sync or Express Sync feature, you can set Data Download to Yes. Note If you download data in replication mode, the capacity of the cache disk must be 10% larger than the size of the files that you want to replicate. Plan the cache capacity based on the expected growth of the bucket usage. When you enable the data download feature for the first time, a full scan is triggered. This process may reduce the performance of the gateway. We recommend that you enable the data download feature during off-peak hours and wait for the system to replicate all data. The data download feature supports only write-once-read-many storage. If multiple users access the bucket at the same time (including but not limited to direct access or access through the gateway), only one user can upload files to the bucket. Other users can only download data. Data loss may occur if multiple users write data to and read data from the bucket at the same time.
   Download Speed Limit	This parameter is available only if you enable the Data Download feature in replication mode. The download speed must be in the range of 0 MB/s to 1,280 MB/s. If you set this parameter to 0 MB/s, the download speed is unlimited.
   Reverse Sync Interval	This parameter is available only if you enable the Data Download feature in replication mode. Valid values: 3600 to 36000. Default value: 36000. Unit: seconds. Note If the bucket contains a large number of objects, we recommend that you specify an interval that is greater than 3,600 seconds. If the interval is less than 3,600 seconds, repeated scans are performed, which results in frequent OSS API calls and consequently increased API request fees. Reverse synchronization is triggered only when you access the directory. To make sure that the data in other directories can be downloaded and new data can be downloaded in real time, we recommend that you use express synchronization.

9. In the Confirmation step, verify your settings and click OK.

Access a share

After you create a share, you can access the share from a client. For more information, see Access an NFS share directory.