Creating an HDFS Storage Pool

Context

Only one storage pool whose Service Type is HDFS can be created, and the storage pool can contain one or multiple disk pools.

Procedure

1. Choose Cluster > Cluster > Storage Pool.
2. Click Create.

   The Create Storage Pool page is displayed.

3. In the Basic Information area, configure basic information for the storage pool.

   Table 1 describes related parameters.

   Table 1 Storage pool parameters

   Parameter	Description
   Storage Pool Name	Indicates the name of the storage pool. NOTE: The name must be unique. The name can contain only letters, digits, underscores (_), and hyphens (-). The name contains 1 to 64 characters.
   Service Type	Indicates the service type of the storage pool. Select HDFS.
   Storage Pool Type	Indicates the type of the storage pool. When Service Type is set to HDFS, only Common is supported.
   Security Level	Indicates the security level of the storage pool. When Service Type is set to HDFS, only Node is supported.
   Redundancy Policy	Indicates the redundancy policy of the storage pool. When Service Type is set to HDFS, only EC is supported.
   EC	Indicates the EC redundancy policy of the storage pool. The value is in the format of +M or +M:1, where M indicates the number of parity fragments. Currently, +2:1, +2, +3:1, +3, +4:1, and +4 are supported.

4. In the Disk Pool area, create a disk pool.
   1. Click Create.

      The Create Disk Pool page is displayed.

   2. Set basic parameters for the disk pool. Table 2 describes related parameters.

      Table 2 Disk pool parameters

      Parameter	Description
      Disk Pool Name	Indicates the name of the disk pool. NOTE: The name must be unique. The name can contain only letters, digits, underscores (_), and hyphens (-). The name contains 1 to 64 characters.
      Main Storage	Indicates the main storage type of the disk pool. Possible options are SAS, SATA, SSD card or NVMe SSD, and SSD. NOTE: Meanings of the options are as follows: SAS: SAS HDDs SATA: SATA HDDs SSD card or NVMe SSD: PCIe SSD (NVMe) cards or NVMe SSDs SSD: SAS SSDs and SATA SSDs
      Cache	Indicates the cache type of the disk pool. Possible options are SSD card or NVMe SSD and SSD.
      Max. Main Storage Media per Node	Indicates the maximum number of storage disks that can be used by a single node to store user data. The value of this parameter determines the allocation of cache and compute resources on the node. Set this parameter based on site requirements. To ensure that cache resources can be allocated to newly added main storage disks in the case of capacity expansion, you are advised to set this parameter based on the total number of main storage disks after capacity expansion. If the value is too small, newly added main storage disks cannot be allocated with cache resources. Cache resources can be allocated to newly-added main storage disks only after the capacities of both main storage disks and cache disks are expanded. If the value is too large, extra cache resources are reserved. As a result, cache resources cannot be fully utilized to improve read/write performance. If you select Default, the system automatically determines the value based on the number of selected main storage disks. Assume that the number of selected main storage disks is N: If N ≤ 12, a single node supports a maximum of 12 main storage disks. If 12 < N ≤ 24, a single node supports a maximum of 24 main storage disks. If N = 25, a single node supports a maximum of 25 main storage disks. If 25 < N ≤ 36, a single node supports a maximum of 36 main storage disks. If you select Custom, set the value based on site requirements. The value ranges from 4 to 36.
      Tier Grade	Indicates the tier grade of the disk pool, which is defined based on the type of main storage disks in the disk pool. Possible values are Hot, Warm, Cold, and Default. Choose Services > HDFS Service > Tiering. You can store different files in disk pools of different tier grades by creating a tiering policy. NOTE: If you select Default, when Main Storage is set to SSD or SSD card or NVMe SSD, the tier grade of the disk pool is Hot. When Main Storage is set to SAS, the tier grade of the disk pool is Warm. When Main Storage is set to SATA, the tier grade of the disk pool is Cold.

   3. In the Choose Node and Disk area, select the nodes and disks that are used to create the disk pool.
      

      • You can click Add and add nodes and disks in the cluster on the Choose Node and Disk page that is displayed.
      • You can select one or more added nodes or disks and click Remove to remove them.
   4. Click OK and confirm your operation as prompted.

5. Click Create.
6. Confirm your operation as prompted.