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Huawei V2 and V3 Server RAID Controller Card User Guide 36

This document describes the appearances and features of the redundant array of independent disks (RAID) controller cards, how to configure properties for the RAID controller cards, and how to install drivers. The RAID controller cards include the LSI SAS2208, LSI SAS2308, LSI SAS3008, LSI SAS3108, LSI SoftRAID, PM8060, and PM8068.
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Creating Multiple Virtual Drives

Creating Multiple Virtual Drives

Create multiple virtual drives for a RAID array that already has one or more virtual drives. The following uses a RAID 0 array that has one virtual drive (as shown in Figure 4-193 as an example).

Figure 4-193 Virtual Drive Management
  1. Choose Main Menu > Configuration Management > Create Virtual Drive. The Create Virtual Drive screen is displayed, as shown in Figure 4-194.

    Figure 4-194 Create Virtual Drive

  2. Set Select Drives From to Free Capacity, as shown in Figure 4-195.

    Figure 4-195 Create Virtual Drive

  3. Choose Select Drive Groups and press Enter.

    The existing RAID arrays (drive groups) are displayed, as shown in Figure 4-196.

    Figure 4-196 Select Drive Groups

  4. Select the RAID array and press Enter, as shown in Figure 4-197.

    Figure 4-197 Select Drive Groups

  5. Select Apply Changes and press Enter.

    A message is displayed indicating that the operation is successful.

  6. Press Enter to return to the screen shown in Figure 4-198. For details about the parameters, see Table 4-53.

    Figure 4-198 Create Virtual Drive
    Table 4-53 Parameter description

    Parameter

    Description

    Select RAID Level

    Selects a RAID level.

    Protect Virtual Drive

    Status of virtual drive data protection.

    Select Drives From

    Source of member drives of the virtual drive:

    • Unconfigured Capacity: Idle drives that are not added to any virtual drives.
    • Free Capacity: Remaining space of the virtual drive.

    Select Drives

    Selects member drives.

    Virtual Drive Name

    Name of the virtual drive.

    Virtual Drive Size

    Capacity of the virtual drive. The default value is the current largest capacity supported.

    Virtual Drive Size Unit

    Unit of capacity.

    Strip Size

    Strip size of the virtual drive. Options include 64 KB, 128 KB, 256 KB, 512 KB, and 1 MB. The default value is 256 KB.

    The default size is used during RAID configuration.

    Read Policy

    Options for reading data on a virtual drive.

    • No Read Ahead: disables the Read Ahead function.
    • Read Ahead: enables the Read Ahead function. The controller pre-reads sequential data or the data predicted to be used and saves it in the cache.

      Default value: Read Ahead

    NOTE:

    To achieve optimal disk performance, set the policy to Read Ahead for HDDs and No Read Ahead for SSDs.

    Write Policy

    Default cache write policy of the RAID array.

    The values of this parameter vary depending on the firmware version.

    • If the firmware version of the LSI SAS2208 is 3.460.165-8277, the cache write policies are as follows:
      • Write Through: Once the drive subsystem receives all data, the controller notifies the host that data transmission is complete.
      • Write Back: If the supercapacitor is not configured or the supercapacitor is faulty, the RAID controller card automatically switches to the Write Through mode.
      • Always Write Back: Once the cache receives all data, the controller notifies the host that data transmission is complete.
    • If the firmware version of the LSI SAS2208 is 3.400.95-4061, the cache write policies are as follows:
      • Write Through: Once the drive subsystem receives all data, the controller notifies the host that data transmission is complete.
      • Write Back: If the supercapacitor is not configured or the supercapacitor is faulty, the RAID controller card automatically switches to the Write Through mode.
      • Force Write Back: Once the cache receives all data, the controller notifies the host that data transmission is complete.
      Default value: Write Back
      NOTE:
      If this parameter is set to Write Back,, the current write cache policy will automatically change to Write Through when:
      • The RAID controller card does not have a supercapacitor.
      • The supercapacitor is being charged and discharged.
      • The supercapacitor is damaged.
      • Pinned or preserved cache exists.

      If this parameter is set to Always Write Back or Force Write Back, the DDR write data of the RAID controller card will be lost when:

      • The server is powered off unexpectedly.
      • The supercapacitor is not installed.
      • The supercapacior is being charged.

      This mode is not recommended.

    I/O Policy

    Options for reading data from special virtual drives. This policy does not affect cache prefetch.

    • Direct:
      • Read scenarios: Data is directly read from hard drives. (If Read Policy is set to Read Ahead, data is read from the cache.)
      • Write scenarios: Data is written to the RAID cache. (If Write Policy is set to Write Through, data is directly written into hard drives.)
    • Cached: Data is read from or written to the cache. Use this option only when configuring CacheCade 1.1.

    Default value: Direct

    NOTE:

    The LSI SAS2208 does not support the CacheCade function.

    Access Policy

    Data access policy.

    • Read/Write: Read and write operations are allowed.
    • Read Only: The virtual drive is read-only.
    • Blocked: The virtual drive is blocked from access.

    Default value: Read/Write

    Drive Cache

    Physical hard drive cache policy.

    • Unchanged: uses the current cache policy.
    • Enable: writes data to the cache before writing data to the hard drive. This option improves data write performance. However, data will be lost if there is no protection mechanism against power failures.
    • Disable: writes data to a hard drive without caching. Data is not lost in the event of power failure.

    Default value: Unchanged

    Disable Background Initialization

    Enables or disables background initialization.

    Default Initialization

    Default initialization mode.

    • No: Initialization is not performed.
    • Fast: Fast initialization.
    • Full: Full initialization.

    Emulation Type

    Sets the sector size reported to the OS.

    If the member drive is 512B/512B:

    • Default: The logical drive sector is 512B/512B.
    • None: The logical drive sector is 512B/512B.
    • Force: The logical drive sector is 512B/4KB.

    If the member drive is 512B/4KB:

    • Default: The logical drive sector is 512B/4KB.
    • None: The logical drive sector is 512B/512B.
    • Force: The logical drive sector is 512B/4KB.

    Save Configuration

    Save the settings.

  7. Set virtual drive properties, as shown in Table 4-53.
  8. Select Save Configuration and press Enter.

    A confirm screen is displayed.

  9. Select Confirm and press Enter.
  10. Select Yes and press Enter.

    A message is displayed indicating that the operation is successful.

  11. Select OK and press Enter.

    You can check the virtual drives on the Virtual Drive Management screen. Figure 4-199 shows the virtual drives configured.

    Figure 4-199 Virtual Drive Management

A RAID array supports a maximum of 16 virtual drives. To create another virtual drive, repeat 1 to 11.

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Updated: 2019-11-01

Document ID: EDOC1000004186

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