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How to Enable Discontiguous Block Group Feature (discontig-bg) on OCFS2 1.4 (Doc ID 1382196.1)

Last updated on APRIL 21, 2020

Applies to:

Linux OS - Version Oracle Linux 5.3 and later
Oracle Cloud Infrastructure - Version N/A and later
Linux x86-64
Linux x86


Most file systems pre-allocate space for inodes during format. OCFS2 dynamically allocates this space when required.

However, this dynamic allocation has been problematic when the free space is very fragmented, because the file system requires the inode and extent allocators to grow in contiguous fixed-size chunks.

The discontiguous block group feature (discontig-bg) takes care of this problem by allowing the allocators to grow in smaller, variable-sized chunks.

This note describes how to enable this feature on OCFS2 1.4.


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