In HUAWEI OceanStor V3,HyperSnap of a LUN uses the Copy On Write method to keep track of changes blocks

The statement is correct. HUAWEI OceanStor V3's HyperSnap feature for LUNs operates on the Copy-on-Write (COW) principle. When a snapshot of a source LUN is created, a point-in-time image is established. If an application server subsequently sends a write request to a data block on that source LUN for the first time since the snapshot was taken, the storage system first copies the original, unmodified data block to a designated snapshot storage area (often called the COW data space or snapshot pool). Only after this original data is preserved is the new data written to the source LUN. This ensures that the snapshot can always reconstruct the exact state of the LUN at the moment the snapshot was created by referencing the original data blocks saved in the COW space.

This is a "TRUE or FALSE" question. The "False" option is incorrect because the fundamental working principle of the HyperSnap feature in the OceanStor V3 series is explicitly documented by Huawei as being based on the Copy-on-Write (COW) mechanism. While other snapshot technologies like Redirect-on-Write (ROW) exist, they are not the method used by the traditional HyperSnap feature in this specific product series.

1. Huawei OceanStor V3 Series V300R006 Snapshot Feature Guide for Block 05.

Section: 1.3 Working Principle

Content: This document explicitly details the snapshot creation and data write process. It states

"When an application server writes data to a source LUN for the first time after a snapshot is created

the storage system copies the original data from the source LUN to a COW data space before writing the new data to the source LUN. This is the copy-on-first-write (COFW) technique." COFW is a specific implementation of the general Copy-on-Write (COW) principle.

2. Huawei OceanStor V3/V5/18000 Series V300R003 Basic Storage Service Guide 02.

Section: 4.1.2 Working Principle

Content: This guide provides a clear and direct confirmation: "When an application server writes data to the source LUN

the storage system uses Copy-on-Write (COW) to save the original data to the COW data space. The snapshot LUN then points to the original data in the COW data space." This directly validates the statement in the question.