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Basic Storage Service Guide for File 15

OceanStor 5300 V3, 5500 V3, 5600 V3, 5800 V3, and 6800 V3 Storage System V300R003

"This document describes the basic storage services and explains how to configure and managebasic storage services."
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Creating a Storage Pool

Creating a Storage Pool

Create storage pools for application servers to use the storage space provided by a storage system.

Prerequisites

A disk domain is created.

Context

  • You are advised to use different disk domains to create storage pools for block storage service and file storage service.
  • A storage pool is a logical combination of one or multiple storage tiers in a disk domain. Different storage tiers may have different RAID policies.

  • A RAID policy includes a RAID level and the number of disk blocks and parity blocks that compose this RAID level.

  • The RAID level is classified into typical configuration and flexible configuration based on the number of disk blocks and parity blocks. The detailed configuration is shown in Table 3-4.
    Table 3-4  RAID level configuration

    RAID Level

    Typical Configuration

    Flexible Configuration

    RAID 0

    -

    -

    RAID 1

    • 2Da
    • 4D

    -

    RAID 10

    -

    -

    RAID 3

    • 2D+1Pb
    • 4D+1P
    • 8D+1P

    2D+1P to 13D+1P

    RAID 5

    • 2D+1P
    • 4D+1P
    • 8D+1P

    2D+1P to 13D+1P

    RAID 50

    • (2D+1P)x2
    • (4D+1P)x2
    • (8D+1P)x2

    -

    RAID 6

    • 2D+2P
    • 4D+2P
    • 8D+2P
    • 16D+2P

    2D+2P to 26D+2P

    a: D indicates the data block.

    b: P indicates the parity block.

    NOTE:

    If the RAID level of one storage tier is configured with flexible configuration first, this tier is the primary control tier that controls other tiers' RAID policies. The number of RAID data disks of the primary control tier and the number of RAID data disks of other tiers must be a multiple of 1, 2, 4, or 8. For example, if the performance tier is the primary control tier and its RAID policy is 3D+1P, the RAID policy of other tiers must be 3D+1P, 6D+2P, or so on, and cannot be 4D+1P. If you want to change the current primary control tier, deselect this tier and select it again.

  • The following describes the storage tiers in a storage pool:

    • The high performance tier, providing the highest performance, consists of SSDs. As SSD storage media have a high cost and low capacity, this tier is applicable to the applications such as database indexes that require a high random read/write performance.
    • The performance tier, providing modest performance, consists of SAS disks. As SAS storage media have a modest cost and large capacity, this tier provides high reliability, suitable for online applications.
    • The capacity tier, providing the lowest performance, consists of NL-SAS disks. As NL-SAS storage media have the lowest cost and largest capacity, the capacity tier is suitable for non-critical services such as data backup.
  • A storage pool with only one storage tier does not support the SmartTier feature.

Procedure

  1. Log in to DeviceManager.
  2. Choose Provisioning > Storage Pool.
  3. Click Create.

    The Create Storage Pool dialog box is displayed.

  4. Enter a name and description for the storage pool.
    1. In the Name text box, enter a name for the storage pool.

      NOTE:
      • The name must be unique.
      • The name can contain only letters, digits, periods (.), underscores (_), and hyphens (-).
      • The value contains 1 to 31 characters.

    2. In the Description text box, enter the function and properties of the storage pool. The descriptive information helps identify the storage pool.
  5. In the Usage text box, select a usage type for the storage pool.

    The value can be Block Storage Service and File Storage Service.

    NOTE:
    Usage is unchangeable after it is configured.
    • A storage pool whose Usage is Block Storage Service allows you to create LUNs only.
    • A storage pool whose Usage is File Storage Service allows you to create file systems only.

  6. In Disk Domain, select the disk domain that the storage pool belongs to.
  7. In Storage Medium, select the storage tiers needed for the storage pool and set related parameters.
    1. Select storage tiers that meet service requirements.
    2. Set basic properties for the storage tiers. Table 3-5 describes related parameters.

      Table 3-5  Storage tier parameters

      Parameter

      Description

      Setting

      RAID Policy

      RAID level. The system supports RAID 0, RAID 1, RAID 10, RAID 3, RAID 5, RAID 50, and RAID 6.
      NOTE:

      RAID 0 only supports configuration in CLI mode. For details, see the OceanStor 5300 V3&5500 V3&5600 V3&5800 V3&6800 V3 Storage System V300R003 Command Reference .

      Select a RAID policy based on the planned solution.

      • Default RAID policy of the high performance tier: RAID 10
      • Default RAID policy of the performance tier: RAID 5 (4D+1P)
      • Default RAID policy of the capacity tier: RAID 6 (4D+2P)

      Capacity

      The capacity that the storage tier provides for the storage pool.

      Two capacity levels are provided: TB, GB.

      The capacity must be not larger than the available capacity of the storage tier.

      NOTE:
      • If the storage pool consists of multiple storage tiers, you are advised to set a SmartTier policy. The policy enables data to migrate among different types of storage tiers, optimizing storage performance distribution.
      • You are advised to create RAID 6 groups on the capacity tier to ensure data security.

  8. Set properties of the storage pool according to the usage types.
    • Block Storage Service
      1. Click Set SmartTier Policy to configure a SmartTier policy for the storage pool being created. Table 3-6 lists related parameters.


        Table 3-6  SmartTier policy of the storage pool

        Parameter

        Description

        Setting

        Service Monitoring Period

        Period of time during which the service is monitored and hotspot statistics is collected after you select Enable I/O monitoring. The statistics serves as guidance for data to migrate among different storage tiers.

        You can specify the period by setting days, Start Time, and Duration.

        [Default value]

        I/O monitoring disabled

        Data Migration Plan

        The trigger policy of data relocation between the storage tiers in a storage pool. Possible policies are:
        • Manual: You must manually trigger the data relocation among storage tiers. The data relocation process is transparent to application servers. Manual data relocation can be performed anytime.
        • Periodical: You must specify the start time and duration of data relocation for the storage system to perform data relocation automatically at the specified time. This reduces the management cost and complexity. The data relocation process is transparent to application servers. Automatic data relocation is performed only at the specified time.

        [Default value]

        Manual

        NOTE:
        • If Data Migration Plan is set to Periodical, I/Os are monitored on a 7x24 basis by default. If Data Migration Plan is set to Manual, select a path to start migration.
        • A SmartTier policy is only applicable when Usage of a storage pool is configured as Block Storage Service.

        • A storage pool configured with SmartTier needs to reserve free space because SmartTier requires extra data exchange space to dynamically migrate data.
      2. Click OK. The Create Storage Pool dialog box is displayed.
      3. Click Advanced to set advanced properties for the storage pool.

        Table 3-7 describes the related parameters.

        Table 3-7  Storage pool advanced parameters

        Parameter

        Description

        Setting

        Data Protection Capacity Alarm Threshold (%)

        When ratio the data protection capacity of the storage pool to the total capacity of the storage pool exceeds the capacity alarm threshold, the system generates an alarm.

        [Value range]

        1 to 100

        [Default value]

        100

        Used Capacity Alarm Threshold (%)

        If a storage pool contains a file system or a thin file system and both file systems are equipped with value-added services, an alarm will be generated when the percentage of the storage pool's used capacity to its total capacity reaches the alarm threshold of the used capacity. The alarm is generated in 3 circumstances:
        • When the used capacity reaches the used capacity alarm threshold, the system generates an alarm informing that the capacity of storage pool is insufficient.
        • When the used capacity alarm threshold is no greater than 88 and the used capacity reaches 90%, the system generates an alarm informing that the storage pool is running out.
        • When the used capacity alarm threshold is greater than 88 and the used capacity reaches (used capacity alarm threshold +2) %, the system generates an alarm informing that the storage pool is running out.
        NOTE:
        If the used capacity alarm threshold is set as 85, when the used capacity reaches 85%, the system generates an alarm informing that the capacity of the storage pool is insufficient, and when the used capacity reaches 90%, the system generates an alarm informing that the storage pool is running out. If the used capacity alarm threshold is set as 91, when the used capacity reaches 93%, the system generates an alarm informing that the storage pool is running out.

        A proper used capacity alarm threshold helps you monitor the capacity usage of a storage pool.

        [Value range]

        1 to 95

        [Default value]

        80

        Data Migration Granularity

        A logical storage space with a fixed size divided from a CKG. It is the smallest unit (granularity) for data migration and hotspot data statistics collection. It is also the smallest unit for space application and release in a storage pool. The default value 4 MB is recommended. The value cannot be changed after being set.
        NOTE:

        You can configure this parameter only when RAID levels of all storage tiers are typical configuration.

        [Value range]

        512 KB to 64 MB

        [Default value]

        4 MB

        Stripe Depth

        Stripe refers to that continuous data is divided into data blocks of the same size and data blocks are distributed on different disks of a storage device. In this way, I/O loads are balanced among disks, improving read/write performance.

        Stripe depth refers to stripe size, indicating the size of data blocks on each disk. A Smaller stripe size indicates smaller data blocks. These data blocks are distributed on more disks, improving transmission performance. However, more time is required to find different data blocks, decreasing disk locating performance. On the contrary, fewer data blocks indicate lower transmission performance but higher disk locating performance.

        Possible values are:
        • System auto select

          The system selects the optimal stripe depth based on the RAID policy of the storage tier and data migration granularity.

        • 32 KB
        • 64 KB
        • 128 KB

          128 KB is recommended for random read/write services (such as in database scenarios).

        • 256 KB
        • 512KB

          512 KB is recommended for sequential read/write services (such as media asset scenarios)

        NOTE:
        The parameter value cannot be changed after being determined.

        [Default value]

        System auto select

      4. Click OK.
    • File Storage Service
      1. Click Advanced to set advanced properties for the storage pool.
        Table 3-8 describes the related parameters.
        Table 3-8  Storage pool advanced parameters

        Parameter

        Description

        Setting

        Used Capacity Alarm Threshold (%)

        If the storage pool contains a thin file system, when the percentage of the used capacity of the storage pool to the total capacity of the storage pool (the used capacity for short) reaches the used capacity alarm threshold, the system generates an alarm. The alarm is generated in 3 circumstances:
        • When the used capacity reaches the used capacity alarm threshold, the system generates an alarm informing that the capacity of storage pool is insufficient.
        • When the used capacity alarm threshold is no greater than 88 and the used capacity reaches 90%, the system generates an alarm informing that the storage pool is running out.
        • When the used capacity alarm threshold is no greater than 88 and the used capacity reaches (used capacity alarm threshold +2)%, the system generates an alarm informing that the storage pool is running out.
        NOTE:
        If the used capacity alarm threshold is set as 85, when the used capacity reaches 85%, the system generates an alarm informing that the capacity of storage pool is insufficient, and when the used capacity reaches 90%, the system generates an alarm informing that the storage pool is running out. If the used capacity alarm threshold is set as 91, when the used capacity reaches 93%, the system generates an alarm informing that the storage pool is running out.

        A proper used capacity alarm threshold helps you monitor the capacity usage of a storage pool.

        [Value range]

        1 to 95

        [Default value]

        80

        Data Migration Granularity

        A logical storage space with a fixed size divided from a CKG. It is the smallest unit (granularity) for data migration and hotspot data statistics collection. It is also the smallest unit for space application and release in a storage pool. The default value 4 MB is recommended. The value cannot be changed after being set.
        NOTE:

        You can configure this parameter only when RAID level of storage tiers are typical configuration.

        [Value range]

        512 KB to 64 MB

        [Default value]

        4 MB

        Stripe Depth

        Stripe refers to that continuous data is divided into data blocks of the same size and data blocks are distributed on different disks of storage devices. In this way, I/O loads are balanced among disks, improving read/write performance.

        Stripe depth refers to stripe size, indicating the size of data blocks on each disk. Smaller stripe size indicates smaller data blocks. These data blocks are distributed on more disks, improving transmission performance. However, more time is required to find different data blocks, decreasing disk locating performance. On the contrary, fewer data blocks indicate lower transmission performance but higher disk locating performance.

        The value of this parameter can be:
        • System auto select

          The system selects the optimal stripe depth based on the RAID policy of the storage tier and data migration granularity.

        • 32 KB
        • 64 KB
        • 128 KB

          128 KB is recommended for random read/write services (such as in database scenarios).

        • 256 KB
        • 512KB

          512 KB is recommended for sequential read/write services (such as media asset scenarios)

        NOTE:
        The parameter value cannot be changed after being determined.

        [Default value]

        System auto select

      2. Click OK.
  9. In the Create Storage Pool dialog box, click OK.

    The Execution Result dialog box is displayed indicating that the operation succeeded.

  10. Click Close.
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Updated: 2019-02-01

Document ID: EDOC1000084198

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