表 14-1. Device Mapper 命令

命令

说明

 

 

multipath -h

打印使用信息。

multipath -ll

使用所有可用信息 （sysfs、 Device Mapper、路

 

径检查程序等信息）显示当前多路径拓扑。

multipath

使用简化输出重新集合多路径设备。

multipath -f

对特定多路径设备清除 Device Mapper。在删除

<multipath_dev_node>

基本物理设备或取消其映射时使用。

multipath -F

清除所有未使用的多路径设备映射。

rescan_dm_devs

Dell 提供的脚本。强制重新扫描主机 SCSI 总

 

线，并根据需要集合多路径设备。适用情况：

 

• LUN 动态映射至主机。

 

• 有新目标添加至主机。

 

• 需要恢复存储阵列的故障。

 

 

限制和已知问题

•在某些错误情况下，如果已设置 no_path_retry 或 queue_if_no_path 功

能，则应用程序可能会挂起。要克服这些情况，必须为每个受影响的 多路径设备输入以下命令：

dmsetup message [ 设备 ] 0 "fail_if_no_path"

此 [ 设备 ] 是路径设备名 （例如， mpath2 ；未指定路径）

•如果在卸载卷之前删除了 Device Mapper 设备， I/O 可能会挂起。

•如果 scsi_dh_rdac 模块未包含在 initrd 中，设备搜索可能变得更缓慢， 并且系统日志可能会写满缓冲区 I/O 错误信息。

•如果主机服务器或存储阵列在 I/O 活动时重新引导，则 I/O 可能会挂 起。在关闭或重新引导主机服务器或存储阵列之前，必须停止存储阵 列的所有 I/O。

•在 MD3600i 系列阵列上恢复发生故障的路径之后，由于驱动程序无法在 没有强制重新扫描的情况下自动检测设备，因此未自动完成故障恢复。 运行命令 rescan_dm_devs 强制重新扫描主机服务器。由此可恢复发 生故障的路径，并激活故障恢复。

配置：Linux 的Device Mapper 多路径

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Dell MD3620F manual 限制和已知问题, 在某些错误情况下，如果已设置 nopathretry 或 queueifnopath 功, ，则应用程序可能会挂起。要克服这些情况，必须为每个受影响的 多路径设备输入以下命令：, 193
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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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