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同一聚合中的NVMe和SAS SSD是否会影响性能?

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适用场景

  • AFF A900、ASA A900
  • AFF A800、ASA A800
  • AFF A400、ASA A400
  • AFF A250、ASA A250
  • NVMe SSD
  • SAS SSD

问题解答

  • 为了获得最佳一致延迟、请在单独的数据聚合中配置NVMe和SAS SSD
    • 迁移后的SAS SSD磁盘架上的数据将已位于单独的聚合中
    • 延迟仍然非常快、因此、除了对延迟最敏感的应用程序之外、大多数应用程序都会注意到这一点。
      • 示例:
        • NVMe SSD的响应速度可能为10微秒、SAS SSD的响应速度可能为50微秒。
        • 这是一种假设、但在本示例中、响应时间比预期差5倍、但在90%以上的使用情形中、50微秒的响应时间非常短。
  • 如果在AFF系统上增加容量、则支持在同一聚合中混用内部和外部SSD
    • 在ONTAP中、NVMe SSD和SAS SSD驱动器都属于"固态"磁盘类-此磁盘类中的延迟大致相等
  • 导入的SAS SSD数据聚合可以通过添加由NVMe SSD或分区组成的RAID组进行扩展
    • ONTAP还允许在同一RAID组中混用SAS SSD和NVMe SSD

 

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