CHAP is an optional feature and is not required to use iSCSI. However, if you do not configure CHAP authentication, any host server connected to the same IP network as the storage array can read from and write to the storage array.

NOTE: When using CHAP authentication, you should configure it on both the storage array (using MDSM) and the host server (using the iSCSI initiator) before preparing virtual disks to receive data. If you prepare disks to receive data before you configure CHAP authentication, you lose visibility to the disks once CHAP

is configured.

CHAP Definitions

To summarize the differences between target CHAP and mutual CHAP authentication, see Table A-3.

Table A-3. CHAP Types Defined

CHAP Type

Description

 

 

Target CHAP

Sets up accounts that iSCSI initiators use to connect to the

 

target storage array. The target storage array then authenticates

 

the iSCSI initiator.

Mutual CHAP

Applied in addition to target CHAP, mutual CHAP sets up an

 

account that a target storage array uses to connect to an iSCSI

 

initiator. The iSCSI initiator then authenticates the target.

 

 

Step 5: Configure CHAP Authentication on the Storage Array (Optional)

If you are configuring CHAP authentication of any kind (either target-only or target and mutual), you must complete this step and "Step 5: Configure CHAP Authentication on the Storage Array (Optional)" on page 64.

If you are not configuring any type of CHAP, skip these steps and go to "Step 7: Connect to the Target Storage Array From the Host Server" on page 70.

NOTE: If you choose to configure mutual CHAP authentication, you must first configure target CHAP.

In terms of iSCSI configuration, the term target always refers to the storage array.

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Appendix—Manual Configuration of iSCSI

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Dell MD3220i, MD3200i manual Configure Chap Authentication on the Storage Array Optional, Chap Definitions

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.