15.00 - Sector Alignment - Teradata Database

Teradata Database Design

Teradata Database
User Guide

Sector Alignment

The Teradata File System supports devices that use either a native 512 byte sector size or a native 4KB sector size.

The new 4KB disk drives can be separated into 2 classes: those that support I/O on non‑4KB aligned disk boundaries and those that do not support non‑4KB aligned I/O. When operating on system with 4KB drives, Teradata Database only performs I/Os on blocks that are full 4KB aligned (in size and length), regardless of the class of the drive.

Teradata Database only supports a homogenous alignment configuration throughout the entire system. On a given system, data on all storage devices is aligned or unaligned, and cannot be both. This also applies across cliques.