NOTE: To ensure data integrity protection, reboot a Linux host server attached to an MD3200i Series storage array using the procedure given below.

Linux Host Server Reboot Best Practices

Its is recommended that you follow the procedures shown below when rebooting your Linux host server using Device Mapper multipathing with an MD3200i Series storage array.

1Unmount all Device Mapper multipath device nodes mounted on the server

#umount <mounted_multipath_device_node>

2Stop the Device Mapper multipath service

#/etc/init.d/multipathd stop

3Flush the Device Mapper multipath maps list to remove any old or modified mappings

#multipath –F

NOTE: The boot operating system drive may have an entry with the Device Mapper multipathing table. This is not affected by the multipath –Fcommand. However, using #multipath –llshould not show any multipathing devices with model “MD3200i” or “MD3200i”.

4Log out of all iSCSI sessions from the host server to the storage array

# iscsiadm –m node --logout

Important Information About Special Partitions

When using Device Mapper with the MD3200i Series array, all physical disks are assigned a disk device node. This includes a special device type used for in-band management of the MD3200i Series array, known as the Access Disk or Universal Xport device.

CAUTION: Certain commands, such as lsscsi, displays one or more instances of Universal Xport devices. These device nodes must never be accessed, mounted, or used in any way. Doing so could cause loss of communication to the storage array and possibly cause serious damage to the storage array, potential making data stored on the array inaccessible.

Configuration: Device Mapper Multipath for Linux

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MD3200i, MD3220i specifications

The Dell MD3220i and MD3200i are part of Dell's extensive line of modular storage solutions, designed to support organizations in optimizing their data management and scalability requirements. These models offer reliable performance and flexible features, making them suitable for various workloads including virtualization, cloud storage, and disaster recovery.

One of the standout features of the MD3220i and MD3200i is their support for iSCSI storage networking. By utilizing the Internet Small Computer Systems Interface (iSCSI) protocol, these systems provide organizations with a cost-effective way to connect their storage over existing network infrastructure, enabling efficient data transfers and management.

Both models are equipped with dual controllers that ensure high availability and failover capabilities, which are crucial for meeting uptime requirements in mission-critical environments. The dual controllers also facilitate load balancing and increase overall system performance, as they allow multiple paths to the storage, enhancing I/O performance.

Scalability is another key characteristic of the MD3220i and MD3200i. These storage arrays can be expanded to meet growing storage demands, supporting up to 240TB of raw capacity with up to 16 additional expansion enclosures. This flexibility allows organizations to start with a smaller configuration and grow their storage capabilities without a complete overhaul of the existing infrastructure.

The units also support multiple disk types, including traditional spinning disks, solid-state drives (SSDs), and a combination of both. This versatility enables users to tailor storage configurations to their specific performance and budgetary needs. Furthermore, the systems feature advanced data management technologies such as snapshots and remote replication, providing essential tools for data protection.

With their ease of management, the MD3220i and MD3200i are designed for straightforward configuration and operation. The intuitive management interfaces allow IT professionals to monitor performance, configure storage, and manage data effectively, ensuring businesses can maintain optimal system availability.

In summary, the Dell MD3220i and MD3200i are robust, scalable, and versatile storage solutions that cater to diverse organizational needs. Their integrated technologies, such as iSCSI support, dual controller architecture, and advanced data management features, make them an ideal choice for modern data centers looking to enhance storage capabilities while ensuring reliability and performance.
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