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Oracle Linux: How To Align Partitions on Large Hard Disk Drives (HDDs) for Optimal Performance (Doc ID 1523947.1)

Last updated on JUNE 24, 2020

Applies to:

Oracle Cloud Infrastructure - Version N/A and later
Linux OS - Version Oracle Linux 5.5 with Unbreakable Enterprise Kernel [2.6.32] to Oracle Linux 7.5 [Release OL5U5 to OL7U5]
Linux x86-64
Linux x86


Large modern Hard Disk Drives (HDDs) implement a new feature called Advanced Format Technology (AFT) / Large Sector / 4K Sector, where the sector size is 4096 bytes instead of the traditional 512 bytes.
The two primary advantages of AFT are:
- the ability to offer large/huge (>2Tb) Hard Disk Drive (HDD) sizes -the previous 512 byte/sector limits devices to <2Tb
- improved I/O performance
This document describes how to align partitions on large/huge (> 2Tb) HDDs for optimal I/O performance.


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