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--- start:noholesbtrfs [2022/06/30 13:25] – created peter
+++ start:noholesbtrfs [2023/09/14 20:48] (current) – peter
@@ Line 1: / Line 1: @@
+DATE CHECKED THIS PAGE WAS VALID: 14/09/2023
 If you created your BTRFS filesystem a little while ago you might not have no_holes support which is simply an improvement that can be added and reduces the size metadata consumes on the disk. You can check if your filesystem has it in 2 ways:
@@ Line 11: / Line 13: @@
 {{:images:noholesbtrfs.png|}}
+As you can note, NO_HOLES is listed under incompat_flags.
+Another method is to check via the UUID in this way:
+<code>
+ls /sys/fs/btrfs/383732b1-5e87-4b68-a15a-f044bc559877/features/
+</code>
+{{:images:noholesbtrfs2.png|}}
+As we can see no_holes is also listed here.
+To add no_holes support the disk must be UNMOUNTED. This might mean you have to boot off a live CD like an ubuntu live ISO from a USB stick.
+Once you have unmounted the filesystem you can easily add no_holes support with the -n flag as such:
+<code>
+sudo btrfstune -n /dev/nvme0n1p2
+</code>
+Note, as that disk housed my root partition I had to use a live CD in order to run the command successfully then reboot back into my system afterwards.
+This completes how to add the no_hole improvement to a filesystem made prior to v5.15 when it became the default.

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