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Basic Storage Service Configuration Guide for Block

OceanStor Dorado V3 Series V300R002

This document is applicable to OceanStor Dorado3000 V3, Dorado5000 V3, Dorado6000 V3, and Dorado18000 V3. It describes the basic storage services and explains how to configure and manage them.

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Modifying the Advanced Properties of a LUN

Modifying the Advanced Properties of a LUN

This operation enables you to modify the advanced properties of a LUN, such as the LUN write policy.

Prerequisites

At least one LUN has been created.

Procedure

  1. Choose Provisioning > LUN.
  2. Select the LUN whose properties you want to modify and click Properties.

    The Properties of LUN dialog box is displayed.

  3. Click the Advanced tab and modify the desired advanced properties.

    Table 5-12 lists related parameters.
    Table 5-12 Advanced properties of a LUN

    Parameter

    Description

    Setting

    Owning Controller

    Owning controller of a LUN. You are advised to allocate LUNs to both controllers for load balancing.

    [Example]

    CTE0.B

    Working Controller

    Working controller of a LUN, which is the only controller that processes read/write I/Os on the LUN. If hosts send I/Os to a non-working controller, the I/Os are forwarded to the working controller for processing.

    [Example]

    CTE0.B

    Thin LUN Alarm Threshold

    This parameter is valid only when the selected LUN is a thin LUN and the operating system of the application server that owns the LUN is Windows Server 2012.

    Once this parameter is enabled, the application server will receive a threshold alarm when the percentage of the LUN's used capacity to its total capacity exceeds Alarm Threshold (%).

    [Value range]

    50 to 99

    [Default value]

    90

    LUN Write Policy

    The LUN write policy can be:

    • Write back: Data is first written onto a cache. The cache schedules the data and writes the data to disks.
    • Write through: Data is directly written onto disks without passing through the cache.
    NOTE:
    • Writing data onto a cache is fast. Therefore, write back delivers better write performance than write through.
    • The write policy of common LUNs can only be write back and cannot be modified.

    [Example]

    Write back

    [Default value]

    • eDevLUNs: write through
    • Local LUNs: write back
    NOTE:

    After a masqueraded eDevLUN is created, you cannot modify its LUN write policy. You can modify the policy only after you manually take over the masqueraded eDevLUN on the CLI.

    Masquerading

    Masquerading replaces identification information of LUNs on a local device with that on the heterogeneous remote device to take over the remote LUNs online.

    Masquerading types can be:

    • No masquerading
    • Inherited masquerading

      Applies to a local LUN to inherit a remote LUN's information, such as the VID, PID, and SCSI protocol versions.

    • Basic Masquerading

      Applies to eDevLUNs, used for replacing the basic LUN information such as the VID, PID, and LUN WWN.

    • Extended Masquerading

      Applies to eDevLUNs, used for replacing the basic LUN information and extended LUN information such as the SCSI protocol version, owning controller, and working controller.

    • Third-party

      Applies to eDevLUNs, used for taking over heterogeneous storage systems from third-party vendors online. (Some product models may not support this type.)

    [Example]

    Inherited masquerading

    [Default value]

    No masquerading

    NOTE:
    • The selection of Basic Masquerading or Extended Masquerading depends on the vendor and version of the multipathing software and the versions of Huawei heterogeneous storage systems. For recommended parameter settings in different scenarios, see the SmartVirtualization feature guide specific to your product model.
    • If you select Inherited masquerading, Remote Device must be specified.
    • The masquerading type cannot be changed for a LUN that has been mapped to a host or added to a HyperMetro pair.
    • If you want to change the masquerading type, change the current masquerading type to No masquerading and then specify a new type.

    Takeover LUN WWN

    WWN of the eDevLUN after takeover.

    [Example]

    -

  4. Confirm the modification.

    1. Click OK.

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

    2. Click Close.

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Updated: 2019-07-17

Document ID: EDOC1100049139

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