# 弹性云服务器挂载磁盘
#### 场景描述
弹性云服务器创建成功后，如果发现磁盘不够用或当前磁盘不满足要求，可以将已有磁盘挂载给弹性云服务器，或调用创建云硬盘的接口创建新的磁盘，然后再挂载至弹性云服务器。挂载操作需要调用挂载云硬盘接口。
您可以在创建云服务器时，通过设置"data_volumes"参数值挂载数据盘，也可以在创建云服务器成功后挂载数据盘。本节主要介绍云服务器创建成功后挂载磁盘的场景。
#### 涉及接口
挂载磁盘涉及的接口如下：
- [创建云硬盘]
- [弹性云服务器挂载磁盘]
- [查询弹性云服务器挂载磁盘信息]
 
#### 操作步骤
1. 创建云硬盘。
   
   1. 创建云硬盘。
      - 接口相关信息 URI格式：POST /v2/{project_id}/volumes
        详情请参见[创建云硬盘](https://support.huaweicloud.com/zh-cn/api-evs/evs_04_2065.html)。
        
      
      - 请求示例 POST https://*{endpoint}*/v2/74610f3a5ad941998e91f076297ecf27/volumes
        {endpoint}信息请从[地区和终端节点](https://console.huaweicloud.com/apiexplorer/#/endpoint/ECS)获取。
        Body：
        ```
        {
            "volume": {
                "name": "openapi_vol02", 
                "availability_zone":"az_test_01", 
                "description": "create for api test", 
                "volume_type": "SSD", 
                "size": 40
            }
        }
        ```
        
      
      - 响应示例
        ```
        {
          "volume": {
            "status": "creating",
            "user_id": "f79791beca3c48159ac2553fff22e166",
            "attachments": [],
            "links": [
              {
                "href": "https://xxx/v2/74610f3a5ad941998e91f076297ecf27/volumes/51f45e08-1d4f-44c6-a4a9-84a488e0e8d3",
                "rel": "self"
              },
              {
                "href": "https://xxx/74610f3a5ad941998e91f076297ecf27/volumes/51f45e08-1d4f-44c6-a4a9-84a488e0e8d3",
                "rel": "bookmark"
              }
            ],
            "availability_zone": "az_test_01",
            "bootable": "false",
            "encrypted": false,
            "created_at": "2018-05-16T11:19:33.992984",
            "description": "create for api test",
            "updated_at": null,
            "volume_type": "SSD",
            "name": "openapi_vol02",
            "replication_status": "disabled",
            "consistencygroup_id": null,
            "source_volid": null,
            "snapshot_id": null,
            "shareable": false,
            "multiattach": false,
            "metadata": {
              "__system__volume_name": "openapi_vol02"
            },
            "id": "51f45e08-1d4f-44c6-a4a9-84a488e0e8d3",
            "size": 40
          }
        }
        ```
        
       
   
   2. 记录响应中"volume"的ID。
   
   
   
   
2. 挂载磁盘。
   
   - 接口相关信息 URI格式：POST /v1/{project_id}/cloudservers/{server_id}/attachvolume
     详情请参见[弹性云服务器挂载磁盘](https://support.huaweicloud.com/api-ecs/ecs_02_0605.html)。
     
   
   - 请求示例 POST https://*{endpoint}*/v1/74610f3a5ad941998e91f076297ecf27/cloudservers/9f4d9281-95e7-4915-a126-1ee597101e2e/attachvolume
     {endpoint}信息请从[地区和终端节点](https://console.huaweicloud.com/apiexplorer/#/endpoint/ECS)获取。
     Body：
     ```
     {
         "volumeAttachment": {
              "volumeId": "51f45e08-1d4f-44c6-a4a9-84a488e0e8d3",
              "device": "/dev/sdb",
              "volume_type": "SSD",
              "count": 5,
              "hw:passthrough": "true"
         },
         "dry_run": false
     }
     ```
     
   
   - 响应示例
     ```
     {
         "job_id": "ff80808288d41e1b018990260955686a"
     }
     ```
     
   
   
   
   
3. 确认挂载磁盘是否成功。
   
   - 接口相关信息 URI格式：GET /v1/{project_id}/cloudservers/{server_id}/os-volume_attachments
     详情请参见[查询弹性云服务器挂载磁盘信息](https://support.huaweicloud.com/api-ecs/ecs_02_0603.html)。
     
   
   - 请求示例 GET https://*{endpoint}*/v2.1/74610f3a5ad941998e91f076297ecf27/servers/9f4d9281-95e7-4915-a126-1ee597101e2e/os-volume_attachments
     GET https://*{endpoint}*/v1/74610f3a5ad941998e91f076297ecf27/cloudservers/9f4d9281-95e7-4915-a126-1ee597101e2e/os-volume_attachments
     {endpoint}信息请从[地区和终端节点](https://console.huaweicloud.com/apiexplorer/#/endpoint/ECS)获取。
     
   
   - 响应示例
     ```
     {
         "volumeAttachments": [
             {
                 "device": "/dev/sda",
                 "id": "a26887c6-c47b-4654-abb5-dfadf7d3f803",
                 "serverId": "9f4d9281-95e7-4915-a126-1ee597101e2e",
                 "volumeId": "a26887c6-c47b-4654-abb5-dfadf7d3f803"
             },
             {
                 "device": "/dev/sdb",
                 "id": "51f45e08-1d4f-44c6-a4a9-84a488e0e8d3",
                 "serverId": "9f4d9281-95e7-4915-a126-1ee597101e2e",
                 "volumeId": "51f45e08-1d4f-44c6-a4a9-84a488e0e8d3"
             }
         ]
     }
     ```