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卷组和虚拟机的闪存模式

  • 2021年3月5日
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VM的闪存模式允许将存储层偏好设置为虚拟机或卷组的SSD。

  • 如果没有Flash模式，则关键应用程序（例如关系数据库）的数据可能会耗尽SSD层的房间，因为其他工作负载在同一集群上运行。

  • 发生这种情况时，数据库可能会迁移到HDD层。

  • 对于极端延迟敏感的工作负载，这种向HDD层的迁移可能会对读取性能产生负面影响。

默认情况下，您可以将多达25％的群集SSD层用作VM或VGS的闪存模式空间。

  • 如果启用Flash模式的数据大小启用VM或VGS超过SSD容量的25％，则系统可能会迁移数据。

  • 在向下迁移之前，Flash模式功能试图在SSD层上保存多余的数据一定的时间，以便您可以在集群上采取纠正措施并将其带回稳定。

  • 为了减少闪存模式的使用，我们可以在某些MS或VGS上禁用闪存模式或添加SSD


如果在VM上启用了闪存模式功能，则将连接到VM的所有虚拟磁盘都会自动移动到SSD层。

警告：在某些VM上启用Flash模式可能会提高其性能，但可以降低未启用此功能的其他VM上的性能。

对于VM- ESXI和AHV支持此功能

对于VGS- 所有操纵虚拟机构都支持此功能。

启用闪存模式：

对于VM-我们只能在VM Update Workflow期间启用VM上的功能

对于VGS - 我们可以在创建VG时在VGS上启用功能。

来自CLI：

SSH进入CVM并访问Acrocolis命令行（ACLI）

执行以下命令以启用卷组的闪存模式功能

acli> vg.update vg_name flash_mode = true

有关更多信息，请参考VM和VGS的闪存模式

拉阿吉
The flash mode for VM allows to set the storage tier preference to SSD for a virtual machine or a volume group.\u00a0<\/span><\/p>
  • \t

    Without flash mode, data for a mission critical application such as a relational database can run out of the room in the SSD tier because other workloads running on the same cluster.\u00a0<\/span><\/p>\t<\/li>\t

  • \t

    When this happens, the database could potentially migrate to the HDD tier.<\/span><\/p>\t<\/li>\t

  • \t

    For extreme latency sensitive workloads, this migration to the HDD tier could negatively affect the read and write performance.<\/span><\/p>\t<\/li><\/ul>

    \u00a0<\/p>

    By default, you can use up to 25% of the cluster-wide SSD tier as flash mode space for VMs or VGs.<\/span><\/p>

    • \t

      If the data size for flash mode enabled VMs or VGs exceeds 25% of the SSD capacity, the system may down migrate the data.\u00a0<\/span><\/p>\t<\/li>\t

    • \t

      Before down migration, the flash mode feature tries to preserve the excess data on the SSD tier for some reasonable amount of time so that you can take corrective actions on the cluster and bring it back to stable.<\/span><\/p>\t<\/li>\t

    • \t

      To reduce flash mode usage, we can disable the flash mode on some Ms or VGs or add SSDs<\/span><\/p>\t<\/li><\/ul>


      \u00a0<\/p>

      If flash mode feature is enabled on the VM, all the virtual disks that are attached to the VM are automatically moved to the SSD tier.<\/span><\/p>

      \u00a0<\/p>

      Caution: <\/strong>Enabling flash mode on some VMs might increase their performance, but can lower the performance on other VMs on which this feature is not enabled.<\/span><\/p>

      \u00a0<\/p>

      For VMs<\/strong> - This feature is supported for ESXi and AHV<\/span><\/p>

      For VGs<\/strong> - This feature is supported for all hypervisors.<\/span><\/p>

      \u00a0<\/p>

      Enabling Flash mode:<\/strong><\/p>

      For Vms -- We can enable the feature on the VM only during the VM update workflow<\/span><\/p>

      For VGs -- We can enable the feature on the VGs while creating them.<\/span><\/p>

      \u00a0<\/p>

      From cli:<\/strong><\/p>

      Ssh into the CVM and access acropolis command line (acli)<\/span><\/p>

      Execute the following command to enable flash mode feature for the Volume Group<\/span><\/p>

      acli> vg.update vg_name flash_mode=true<\/span><\/p>

      For more information, please refer to <\/span>Flash mode for VMs and VGs<\/u><\/a><\/p>","quoteUsername":"raaji","translations":{"Common":{"like":"Like","unlike":"Unlike"},"Forum":{"Quote":"Quote","Share":"Share"}}}">

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