故障排除, 194 | Dell MD3600f, MD3620F guide

•如果主机系统正在执行繁重的 I/O 操作，则故障恢复可能会很慢。此时若主机服务器的处理器利用率也很高，则会加剧该问题。

•如果主机系统正在执行繁重的 I/O 操作，则 Device Mapper 多路径服务可能会很慢。此时若主机服务器的处理器利用率也很高，则会加剧该问题。

•如果未将根磁盘列入 multipath.conf 文件中的黑名单，则可为根磁盘创建多路径节点。命令 multipath – ll 会列出有助于确定该问题的供应商 / 产品 ID。

故障排除

问题	解答

如何确定 multipathd 是否正	运行以下命令
在运行？	/etc/init.d/multipathd status
	/etc/init.d/multipathd status
为什么 multipath – ll	先请验证是否搜索到设备。命令 #cat

命令的输出未显示任何设备？ /proc/scsi/scsi 可显示所有已搜索到的设备。

然后验证 multipath.conf 确保已用适当的设置将其更新。

此后运行 multipath。然后再运行 multipath

–ll 就应显示新设备。

为什么没有为新映射的 LUN 在任意目录下运行 rescan_dm_devs。由此应可调分配多路径设备节点？出设备。

如果先前没有映射任何LUN，运行 rescan_dm_devs 而不是 rescan-scsi-

然后映射了部分 LUN。则在	bus 来重新配置 LUN 0。
运行 rescan-scsi-bus.sh
之后无法显示 LUN 0。
已移除 LUN，但多路径映射	移除 LUN 后，多路径设备依然存在。运行
依然存在。	multipath – f < 已删除 LUN 的设备节点 >
	以移除多路径映射。例如，如果删除与 /dev/dm-1
	相关的设备，则必须运行 multipath – f
	/dev/dm-1 从 DM 映射表删除 /dev/dm-1。如果
	已停止 / 重新启动多路径守护程序，则应运行
	multipath – F 清除所有失效的映射。

阵列未执行预期的故障恢复。有时底层驱动程序不能自动检测随阵列回归的设备。运行 rescan_dm_devs 重新扫描主机服务器 SCSI 总线，并在多路径层重新集合设备。

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配置：Linux 的 Device Mapper 多路径

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.

故障排除

为什么 multipath – ll

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MD3620F, MD3600f specifications