HCS-Pre-sales H19-308_V4.0 Exam Questions and Answers PDF

The statement is false. DAS, or Direct-Attached Storage, is not a centralized shared storage architecture. It is storage that connects directly to a single server or host without passing through a dedicated storage network. Because of this direct connection, the storage resources are normally controlled by the attached server and are not naturally shared by multiple servers. A centralized shared storage system is more accurately represented by SAN or NAS. SAN provides shared block-level storage to multiple hosts through FC, iSCSI, or similar storage networks, while NAS provides shared file-level storage through protocols such as NFS or SMB/CIFS. DAS is simple and low-cost for small deployments, but it has limitations in scalability, sharing, and centralized management. Therefore, DAS should not be described as centralized shared storage.

Huawei OceanStor Dorado supports Non-disruptive Upgrade (NDU), which allows the storage system’s software (firmware) to be upgraded while services are running. In a traditional storage environment, an upgrade might require a system reboot or cause a failover that interrupts I/O for several seconds or minutes. However, Dorado ' s NDU leverages the multi-controller architecture and advanced caching mechanisms.

During an NDU, the system upgrades controllers one by one or in batches. While one controller is being upgraded and rebooted, its workloads are transparently taken over by other active controllers in the same cluster. Because the host-side multipathing software handles the path failover and the storage system maintains cache mirroring, the application servers experience zero downtime and negligible performance impact. This feature is essential for mission-critical environments that require 24/7 availability and cannot afford scheduled maintenance windows for routine software updates.

The SMB (Server Message Block) protocol, which is primarily used for Windows-based file sharing, relies on a centralized authentication and authorization mechanism to manage permissions in an enterprise environment. In Huawei OceanStor NAS documentation, Active Directory (AD) is the primary domain controller system supported for the SMB protocol.

When a Huawei storage system joins an Active Directory domain, it can authenticate users and groups defined in the AD, allowing for seamless integration with Windows environments. While LDAP (Option A) and NIS (Option B) are supported by Huawei NAS for the NFS protocol (typically used in Linux/Unix environments), the SMB protocol is inherently designed to work with the Kerberos and NTLM authentication provided by Microsoft’s Active Directory. This ensures that NTFS-style ACLs (Access Control Lists) can be properly mapped and enforced across the network.