Get full access to PostgreSQL High Availability Cookbook - Second Edition and 60K+ other titles, with a free 10-day trial of O'Reilly.

There are also live events, courses curated by job role, and more.

Start your free trial

How to do it...

Assuming pg1 is our current primary node and /dev/VG_POSTGRES/LV_DATA is the device we formatted with XFS, follow these steps there as the root user:

Examine the current fragmentation status with this command:

        xfs_db -f -c frag /dev/VG_POSTGRES/LV_DATA

Defragment the filesystem with xfs_fsr:

        xfs_fsr -t 600 /dev/VG_POSTGRES/LV_DATA

View the real-time fragmentation status afterwards:

        xfs_db -f -c frag -r /dev/VG_POSTGRES/LV_DATA

Get PostgreSQL High Availability Cookbook - Second Edition now with the O’Reilly learning platform.

O’Reilly members experience books, live events, courses curated by job role, and more from O’Reilly and nearly 200 top publishers.

Start your free trial

Don’t leave empty-handed

Get Mark Richards’s Software Architecture Patterns ebook to better understand how to design components—and how they should interact.

It’s yours, free.

Get it now

Check it out now on O’Reilly

Dive in for free with a 10-day trial of the O’Reilly learning platform—then explore all the other resources our members count on to build skills and solve problems every day.

Start your free trial Become a member now