受限映射

大量主机在每个存储分区中最多可映射 256 个逻辑单元号码 (LUN) （0 到 255）。不过，最大映射数会因操作系统变量、故障转移驱动程序问题以及 潜在的数据问题而有所差异。表中所列主机表 9-3存在以下映射限制。

如果尝试将虚拟磁盘映射到超出这些操作系统中限制的某一 LUN，该主 机将无法访问虚拟磁盘。

表 9-3.映射限制

Operating System （操作系统）

最高 LUN

 

 

Windows Server 2003 和 Windows server 2008

255

Linux

255

 

 

使用具有 LUN 映射限制的主机类型时的原则：

•如果存储分区中已有映射 （超过通过限制的主机类型强加的限值）， 则无法将主机适配器更改为受限主机类型。

•考虑默认组对 LUN 的访问已达到最大值 256 （0 到 255）并且已将受 限主机类型添加到默认组的情况。在此情况下，与限制的主机类型关 联的主机能够访问 LUN 在其限值内的默认组中的虚拟磁盘。例如，如 果默认组有两个虚拟磁盘映射到 LUN 254 和 255，则具有受限主机类 型的主机将无法访问这两个虚拟磁盘。

•如果默认组禁用已分配的限制主机类型和存储分区，则只能映射总共 32

个 LUN。创建的所有附加虚拟磁盘都将放入 Unidentified Mappings （未 识别映射）区域。如果其中某一 Unidentified Mappings （未识别映射） 定义了附加映射，则 Define Additional Mapping （定义附加映射）对话 框将显示 LUN 列表，而 Add （添加）按钮不可用。

•请勿在 Windows 主机上配置双重映射。

•如果具有受限主机类型的主机是特定存储分区的组成部分，则该存储 分区中的所有主机均会限制为该受限主机类型所许可的最大 LUN 数。

•如果存储分区已有大于该限制主机类型所许可的映射 LUN，则无法将 具有限制主机类型的主机移动到其中。例如，如果您有只允许 LUN 最 多为 31 的受限主机类型，则无法将该受限主机类型移动到已映射至大 于 31 的 LUN 的存储分区。

配置：磁盘组和虚拟磁盘

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Dell MD3620F, MD3600f manual 受限映射, 117
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MD3620F, MD3600f specifications

Dell's MD3620F and MD3600F storage arrays are designed for businesses seeking dependable, high-performance storage solutions tailored to meet the demands of modern data management. These models offer a blend of scalability, efficiency, and advanced features, making them well-suited for a range of applications, from virtual environments to critical database operations.

One of the primary features of the MD3620F and MD3600F is their support for a hybrid storage architecture. This approach allows organizations to combine flash storage with traditional hard disk drives (HDDs) to optimize performance and cost. The MD3620F focuses heavily on all-flash configurations, delivering exceptional speed and lower latency, ideal for I/O-intensive workloads.

Scalability is another hallmark of these storage solutions. The MD3600F allows users to scale up to 120 drives, providing robust capacity to meet growing data needs. The MD3620F is engineered for environments where data availability and speed are paramount, with support for high IOPS (Input/Output Operations Per Second) and consistent performance under stress.

In terms of data management, both systems integrate with Dell’s proprietary software, which enhances operational efficiency through features like automated tiering. This technology optimizes data placement between different storage types based on access frequency, ensuring that hot data is readily available while reducing costs associated with less critical data.

Reliability is crucial for businesses that depend on their storage systems. The MD3620F and MD3600F come equipped with advanced data protection mechanisms, such as RAID support, which safeguards against data loss, and snapshot capabilities that provide point-in-time copies of data. Moreover, these solutions include hot-swappable components, ensuring minimal downtime for maintenance and repairs.

Connectivity is also a strong suit of these storage arrays. They support multiple connectivity options, including SAS and iSCSI, allowing for flexible integration into existing IT infrastructures. This adaptability enhances their appeal to a wide range of enterprise environments.

In summary, the Dell MD3620F and MD3600F stand out as robust storage solutions with a combination of hybrid and all-flash configurations, scalability, advanced data management tools, and enhanced reliability features. These characteristics make them ideal for organizations looking to enhance their data storage capabilities while maintaining high performance and efficiency.
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