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--- linux:fs:btrfs:maintenance [2020/07/21 07:03] – niziak
+++ linux:fs:btrfs:maintenance [2025/01/03 07:52] (current) – niziak
@@ Line 1: / Line 1: @@
 ====== BTRFS Maintenance scripts ======
+===== btrfsmaintenance =====
+<code bash>
+apt install btrfsmaintenance
+</code>
+<file sh /etc/default/btrfsmaintenance>
+BTRFS_TRIM_PERIOD="weekly"
+</file>
+<code bash>
+systemctl restart btrfsmaintenance-refresh
+#systemctl enable btrfs-scrub.timer btrfs-trim.timer
+#systemctl start btrfs-trim.service
+#systemctl start btrfs-scrub.service
+</code>
+===== Defragment =====
+From [[https://helmundwalter.de/blog/btrfs-finding-and-fixing-highly-fragmented-files/|BTRFS fragmentation can hurt the performance of your System]]
+Find the most fragmented files on your System:
+<code bash>
+find / -xdev -type f| xargs filefrag 2>/dev/null | sed 's/^\(.*\): \([0-9]\+\) extent.*/\2 \1/' | awk -F ' ' '$1 > 500' | sort -n -r | head -30
+</code>
+You should review this list. If there is something with 10000+ extends, it is a candidate to be flagged as nodatacow. In my case, I have discovered that the fail2ban sqlite database was using 170k extends which is a lot!
+<code bash>
+find / -xdev -type f| xargs filefrag 2>/dev/null | sed 's/^\(.*\): \([0-9]\+\) extent.*/\2 \1/' | awk -F ' ' '$1 > 500' | cut -f ' ' -f2 2>/dev/null | xargs -r btrfs -v fi defrag -f -czstd
+</code>
+===== Headline =====
 <file bash /usr/local/bin/btrfsQuota.sh>