http://192.168.180.206:8001/ 2026-05-12T23:33:47+00:00 http://192.168.180.206:8001/ http://192.168.180.206:8001/_media/wiki:dokuwiki.svg text/html 2023-03-13T09:44:00+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:btrfs:btrfs_check?rev=1678700640&do=diff btrfs check checksum error at logical BTRFS warning (device sdb4): checksum error at logical 271624814592 on dev /dev/sdb4, physical 270551072768, root 677114, inode 739, offset 14508666880, length 4096, links 1 (path: Windows_10/Snapshots/{8b68a2dd-457e-496f-96df-cf24806dfe2d}.vdi) text/html 2019-04-12T05:26:13+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:btrfs:btrfs-convert?rev=1555046773&do=diff Ext2 Conversion btrfs-convert is not well tested and recommended. Especially for Kernels > 4.0. Personaly it generates errors on BTRFS which will appear after some time. Better way is to use additional temporary disc to move data to newly created BTRFS. text/html 2025-08-22T15:17:10+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:btrfs:compression?rev=1755875830&do=diff BTRFS compression <https://btrfs.readthedocs.io/en/latest/Compression.html> Compression: * ZLIB -- slower, higher compression ratio (uses zlib level 3 setting) * LZO -- faster compression and decompression than zlib, worse compression ratio, designed to be fast * ZSTD -- (since v4.14) compression comparable to zlib with higher compression/decompression speeds and different ratio levels text/html 2021-03-02T08:45:48+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:btrfs:dedup?rev=1614674748&do=diff BTRFS deduplication Deduplication External tool to find duplicated extens available <https://github.com/markfasheh/duperemove> Simply do 'make' and 'make install' Following binaries will be installed: * btrfs-extent-same * csum-test * duperemove * hashstats * show-shared-extents text/html 2025-03-23T14:50:43+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:btrfs:encrypted?rev=1742741443&do=diff encrypted Consider fill with random data <https://niziak.spox.org/wiki/linux:fs:luks#fill_with_random_data> cryptsetup luksFormat --cipher aes-xts-plain64 --key-size 512 --hash sha512 --sector-size 4096 --verify-passphrase --use-random /dev/nvme0n1p4 blkid /dev/nvme0n1p4 Consider luks header backup home2 UUID=aad5d877-2bc5-460b-8441-32b89c0462e6 none luks,noearly,noauto,loud,discard text/html 2024-12-01T08:59:43+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:btrfs:hints?rev=1733043583&do=diff ! BTRFS Hints Attention * 2021-03: Keep at least 10GB free space ! * 2021-03: Never ever let BTRFS to be out of space. Balande data chunks regulary to always make space for growing metadatas (snapshots) * 2021-03: Do not use quota groups (it is not stable) text/html 2021-10-21T10:57:35+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:btrfs:issues?rev=1634813855&do=diff BTRFS Issues convert to single with failed drive sudo btrfs balance start -dconvert=single -mconvert=single /media Remove drive: sudo btrfs device remove 2 After conversion BTRFS is unmountable. It complains that devices are still missing, even with text/html 2025-01-03T06:52:20+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:btrfs:maintenance?rev=1735887140&do=diff BTRFS Maintenance scripts btrfsmaintenance apt install btrfsmaintenance BTRFS_TRIM_PERIOD="weekly" systemctl restart btrfsmaintenance-refresh #systemctl enable btrfs-scrub.timer btrfs-trim.timer #systemctl start btrfs-trim.service #systemctl start btrfs-scrub.service text/html 2025-03-24T07:32:30+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:btrfs:multidisk?rev=1742801550&do=diff BTRFS on multiple devices <https://serverfault.com/questions/814546/how-to-obtain-read-speeds-of-two-disks-using-mdadm-btrfs-raid1-or-zfs-mirror> Encryption layout BTRFS on crypted devices btrfs raid1 crypt crypt sda1 sdb1 * (-) Encryption has to be performed twice (no problem for modern CPUs) * (+) Bit-flips can be detected immediately and corrected by BTRFS text/html 2024-11-21T16:32:37+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:btrfs:send?rev=1732206757&do=diff send / receive grub-install --target=x86_64-efi --efi-directory=/target/@rootfs/boot/efi --boot-directory=/target/@rootfs/boot --bootloader-id=debian --recheck --no-floppy update-grub mount --rbind /dev /target/@rootfs/dev mount --rbind /proc /target/@rootfs/proc mount text/html 2025-09-13T19:25:11+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:btrfs:snapshots?rev=1757791511&do=diff Snapshots snapper apt-get install snapper snapper-gui Create snapper configuration for subvolumes (specified by mount point): snapper -c root create-config / snapper -c home create-config /home snapper -c opt create-config /opt The default settings will keep 10 hourly, 10 daily, 10 monthly and 10 yearly snapshot. Snapper automatically installs systemd's timers to work on periodic intervals. text/html 2024-11-22T09:39:36+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:btrfs:ssd_san?rev=1732268376&do=diff SSD or SAN !!!!!! DONT Convert duplicated system data, metadata and data to single copy only: btrfs device usage / btrfs balance start -sconvert=single -mconvert=single -dconvert=single / -f # OR if data is already in single mode btrfs balance start -sconvert=single -mconvert=single / -f btrfs device usage / text/html 2024-07-11T18:07:39+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:btrfs:subvolumes?rev=1720721259&do=diff BTRFS subvolumes btrfs subvolume create /BTRFS/sub1 btrfs subvolume create /BTRFS/sub2 btrfs subvolume create /BTRFS/sub3 btrfs subvolume list /BTRFS ID 256 gen 234 top level 5 path sub1 ID 257 gen 227 top level 5 path sub2 ID 258 gen 228 top level 5 path sub3 text/html 2021-02-18T18:54:13+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:btrfs:swap_on_btrfs?rev=1613674453&do=diff SWAP on Btrfs SWAP on BTRFS is supported since Kernel 5.0.7. SWAP cannot be located on snapshoted volume. The best is to create seperate volume for swap file. Get top level ID of BTRFS: btrfs sub list / ID 256 gen 394 top level 5 path @ ID 258 gen 401 top level 5 path @home ...