Cloud Storage Gateway:Manage iSCSI volumes

Create an iSCSI volume

1. On the Gateways page, click the ID of the iSCSI gateway. On the page that appears, click Volumes > Create.

2. In the wizard, configure the parameters described in the following table.

   Configuration example

   Step	Parameter	Description
   Bucket Settings	OSS Endpoint	Select an endpoint for the region in which the bucket is located.
   	Bucket Name	Specify the name of the bucket. An iSCSI gateway does not support a bucket in the Archive storage class or with a back-to-origin routing configuration.
   	Use SSL to Connect Bucket	If you select Yes, the bucket is connected over SSL.
   Basic Information	Volume Name	Specify a name for the volume. The name must be 1 to 32 characters in length, and can contain lowercase letters and digits. The name must start with a lowercase letter.
   	Recover	Select whether to recover the volume based on the specified OSS bucket. Valid values: Yes: When the OSS bucket has been used as the backend storage of the volume, the system attempts to recover the volume based on the metadata in the bucket, such as the size of the volume. No: The system uses the associated OSS bucket to create a volume.
   	Capacity	If you set Recover to No, you must set the Capacity parameter. The capacity must be greater than or equal to 1 GB and less than or equal to 256 TB.
   	Mode	The mode that the gateway uses to read and write files. Valid values: Write Through Mode: In Write Through mode, data reads and writes are sent directly to the OSS bucket. Cache Mode: In Cache mode, data reads and writes are preferentially performed in the on-premises cache disk. Generally, iSCSI gateways have better read and write performance in Cache mode.
   	Cache	If you set Mode to Cache Mode, you must select a cache disk. Note Make sure that you have added a cache disk to the iSCSI gateway. Otherwise, no cache disk is available.
   	Storage Allocation Unit	If you set Recover to No, you must set the Storage Allocation Unit parameter. The supported allocation unit sizes are 8K, 16K, 32K, 64K, and 128K. The default allocation unit size is 32K.
   	Authorization	The one-way Challenge-Handshake Authentication Protocol (CHAP) authentication. If you select CHAP from the Authorization drop-down list, you must set the following parameters: CHAP Username of Initiator: Enter a CHAP username. CHAP Password of Initiator: Enter a CHAP password. The password must be 12 to 16 characters in length.