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linux:fs:btrfs:maintenance [2020/06/02 19:34] niziak created |
linux:fs:btrfs:maintenance [2021/05/13 19:43] (current) niziak |
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| ====== BTRFS Maintenance scripts ====== | ====== BTRFS Maintenance scripts ====== | ||
| + | ===== 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> | ||
| + | #!/bin/bash | ||
| + | [[ ! -d $1 ]] && { echo Please pass mountpoint as first argument >&2 ; | ||
| + | exit 1 ; } | ||
| + | |||
| + | while read x i x g x x l x p | ||
| + | do | ||
| + | volName[i]=$p | ||
| + | done < <(btrfs subvolume list $1) | ||
| + | |||
| + | while read g r e | ||
| + | do | ||
| + | [[ -z $name ]] && echo -e "subvol\tqgroup\ttotal\tunshared" | ||
| + | group=${g##*/} | ||
| + | [[ ! -z ${volName[group]} ]] && name=${volName[group]} || name='(unknown)' | ||
| + | echo $name $g `numfmt --to=iec $r` `numfmt --to=iec $e` | ||
| + | done < <(btrfs qgroup show --raw $1 | tail -n+3) | column -t | ||
| + | </file> | ||
| Line 8: | Line 43: | ||
| To solve ''After deleting a subvolume, you must manually delete the associated qgroup.'' mentioned here: [[https://btrfs.wiki.kernel.org/index.php/Quota_support#Known_issues]] | To solve ''After deleting a subvolume, you must manually delete the associated qgroup.'' mentioned here: [[https://btrfs.wiki.kernel.org/index.php/Quota_support#Known_issues]] | ||
| - | <file bash /usr/local/bin/btrfQGroupClean.sh> | + | <file bash /usr/local/bin/btrfsQGroupClean.sh> |
| #!/bin/bash | #!/bin/bash | ||
| Line 29: | Line 64: | ||
| <file cron crontab> | <file cron crontab> | ||
| - | @daily /usr/local/bin/btrfQGroupClean.sh | + | @daily /usr/local/bin/btrfsQGroupClean.sh |
| </file> | </file> | ||