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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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Managing CacheCade

Managing CacheCade

A special RAID key enables CacheCade to expand the read caching capacity and introduce write caching. Use SSDs to create a CacheCade-dedicated RAID array to function as level-2 cache and provide better I/O performance for the existing RAID array.

Creating a CacheCade Virtual Drive

Scenarios

If a CacheCade RAID key is configured for the LSI SAS3108, you can create a CacheCade virtual drive on the Configuration Utility. The CacheCade virtual drive serves as level-2 cache for the existing RAID.

Procedure

  1. Access the Configuration Utility main screen. For details, see Logging In to the Configuration Utility.
  2. Check that the RAID key is activated.

    1. On the main screen, select Main Menu and press Enter.
    2. Choose Controller Management > Advanced Controller Management > Manage MegaRAID Advanced Software Options to display the Manage MegaRAID Advanced Software Options screen.

      If CacheCade Pro 2.0 exists and its status is Unlimited, the CacheCade RAID key has been activated.

    3. Press Esc to return to the Main Menu screen.

  3. Check that at least one idle SSD is available.

    1. Select Drive Management to view the hard drive list.
    2. Check that at least one idle SSD is available.
    3. Press Esc to return to the Main Menu screen.

  4. Create a CacheCade virtual drive.

    1. Choose Configuration Management > Create CacheCade Virtual Drive.

      The Create CacheCade Virtual Drive screen is displayed, as shown in Figure 8-117. Table 8-36 describes the parameters on the screen.

      Figure 8-117 Create CacheCade Virtual Drive
      Table 8-36 Parameter description

      Parameter

      Description

      CacheCade Virtual Drive Name

      User-defined name of the CacheCade virtual drive.

      Logical Sector Size

      Sector size of the CacheCade virtual drive. This parameter is determined by the selected SSD.

      RAID Level

      RAID level (RAID 0 or RAID 1) of the CacheCade virtual drive.

      Write Cache Policy

      Read/write policy of the CacheCade virtual drive.

      • Write Back: Once all data in the cache is received, the controller card notifies the host that data transmission is complete.
      • Write Through: Once the drive subsystem receives all data, the controller card notifies the host that data transmission is complete.
    2. Set the name, RAID level, and read/write policy of the CacheCade virtual drive.
    3. Under SELECT SSD DRIVES, select the SSDs to be added to the CacheCade virtual drive, and press Enter.

      If [X] is displayed before an SSD, the SSD is selected.

    4. Select Create CacheCade Virtual Drive and press Enter.

      The message "The operation has been performed successfully" is displayed.

    5. Select OK and press Enter.

Enabling SSD Caching for a Common Virtual Disk

Scenarios

This section describes how to enable SSD caching by modifying the common virtual drive properties.

You can enable SSD caching for a common virtual drive in any of the following ways:

  • If a CacheCade RAID key is configured, the Configuration Utility asks you whether to enable SSD Caching during the creation of a common virtual drive.
  • If a CacheCade RAID key is configured, you can modify the common virtual drive properties to enable SSD caching.

Procedure

  1. Access the Configuration Utility main screen. For details, see Logging In to the Configuration Utility.
  2. Enable SSD caching by modifying the common virtual drive properties.

    1. On the main screen, select Main Menu and press Enter.
    2. Select Virtual Drive Management to enter the virtual drive list.
    3. Select the desired virtual drive and press Enter.

      The virtual drive properties screen is displayed, as shown in Figure 8-118. Table 8-37 describes the parameters on the screen.

      Figure 8-118 Virtual drive properties
      Table 8-37 Parameter description

      Parameter

      Description

      Operation

      Operations that can be performed.

      Name

      Name of the virtual drive.

      Raid Level

      RAID level of the virtual drive.

      Status

      Current running status of the virtual drive.

      Size

      Capacity of the virtual drive.

      View Associated Drives

      Displays member drive properties of the virtual drive.

      Advanced

      Displays advanced properties of the virtual drive.

    4. Select Enable SSD Caching for Operation and press Enter.
    5. Select Go and press Enter.

      A confirmation screen is displayed.

    6. Select Confirm and press Enter.

      The drive status changes to [X].

    7. Select Yes and press Enter.

      The message "The operation has been started successfully" is displayed.

    8. Select OK and press Enter.

Deleting a CacheCade Virtual Drive

  • If the CacheCade has been associated with a virtual drive, remove the association between the CacheCade and the virtual drive before you delete the virtual drive. If the CacheCade is not associated with any virtual drive, perform 2.
  • To prevent data loss, do not perform offline operations on the drives in the CacheCade virtual drive.

Procedure

  1. Remove the association between the CacheCade and the virtual drive.

    1. On the Virtual Drive Management screen, select the target virtual drive and press Enter.
    2. Select Operation and press Enter.
      The screen shown in Figure 8-119 is displayed.
      Figure 8-119 Virtual drive operation menu
    3. Select Disable SSD Caching and press Enter.
    4. Select Go and press Enter.

      A confirmation screen is displayed.

    5. Select Confirm and press Enter.
    6. Select Yes and press Enter.

      The system displays a message indicating that the operation is successful.

      If multiple virtual drives are associated with the CacheCade, remove the association between the CacheCade and each virtual drive in the same way.

  2. Delete the CacheCade virtual drive.

    1. Select Virtual Drive Management.
    2. Select the CacheCade virtual drive to be deleted and press Enter.

      The screen shown in Figure 8-120 is displayed. For details about the parameters, see Table 8-38.

      Figure 8-120 Virtual drive properties
      Table 8-38 Parameter description

      Parameter

      Description

      Operation

      Operations that can be performed. Value:

      • Start Locate: locates all member drives of the virtual drive.
      • Stop Locate: stops locating the member drives of the virtual drive.
      • Delete Virtual Drive: deletes a virtual drive.

      Name

      Name of the CacheCade virtual drive.

      Raid Level

      RAID level of the CacheCade virtual drive.

      Status

      Current running status of the CacheCade virtual drive.

      Size

      Capacity of the CacheCade virtual drive.

      View Associated Drives

      Displays member drive properties of the CacheCade virtual drive.

      Current Write Cache Policy

      Current read/write policy of the CacheCade virtual drive. The write policy of virtual drives varies with the firmware version of the LSI SAS3108 RAID card.

      • If the firmware version of the LSI SAS3108 RAID controller card is 4.270.00-4382 or earlier, the following three write policies are supported:
        • Write Back: Once the cache receives all data, the controller notifies the host that data transmission is complete.
        • Write Through: After the disk subsystem receives all data, the controller sends the host a message indicating that data transmission is complete.
        • Write Back with BBU: The controller card automatically switches to the Write Through mode when the controller card has no battery backup unit (BBU), the BBU is being discharged, the BBU is faulty, or the pinned or preserved cache has reached 50% capacityof the physical cache of the RAID controller card. This mode is recommended.
      • If the firmware version of the LSI SAS3108 RAID controller card is 4.650.00-6121 or later, the following three write policies are supported:
        • Write Back: The controller card automatically switches to the Write Through mode when the controller card has no battery backup unit (BBU), the BBU is being discharged, the BBU is faulty, or the pinned or preserved cache has reached 50% capacityof the physical cache of the RAID controller card. This mode is recommended.
        • Write Through: After the disk subsystem receives all data, the controller sends the host a message indicating that data transmission is complete.
        • Always Write Back: Once the cache receives all data, the controller notifies the host that data transmission is complete.
      NOTE:

      In Always Write Back mode, DDR write data of the controller card will be lost if the supercapacitor is not installed or being charged. This mode is not recommended.

      Default Write Cache Policy

      Default read/write policy of the CacheCade virtual drive.

    3. Select Delete Virtual Drive from Operation and press Enter.
    4. Select Go and press Enter.

      A confirmation screen is displayed.

    5. Select Confirm and press Enter.

      The drive status changes to [X].

    6. Select Yes and press Enter.

      A message is displayed indicating that the CacheCade virtual drive is deleted.

    7. Select OK and press Enter.

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Updated: 2019-11-01

Document ID: EDOC1000004186

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