http://192.168.180.206:8001/ 2026-05-12T23:30:39+00:00 http://192.168.180.206:8001/ http://192.168.180.206:8001/_media/wiki:dokuwiki.svg text/html 2023-12-05T15:03:26+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:auto_snapshots?rev=1701788606&do=diff ZFS snapshots zfs list -t snapshot get space used by snapshots zfs list -o space destroy snapshots Destroy all snapshots contains 2022: zfs list -H -t snapshot -o name | grep 2022 | xargs -n1 zfs destroy Tools zfs-auto-snapshot Automatically create, rotate, and destroy periodic ZFS snapshots. text/html 2026-02-11T09:29:11+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:compression?rev=1770802151&do=diff ZFS compresison zfs get compression zfs get compression /rpool zfs get compressratio zfs get compressratio /rpool zfs get compression,compressratio,used,logicalused,referenced,logicalreferenced rpool/data/subvol-118-disk-0 switch to ZSTD From OpenZFS 2.0.0 there is support for ZSTD: text/html 2025-04-09T10:09:51+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:copies?rev=1744193391&do=diff copies=2 For one HDD it is possible to write each data twice. It can protect from: * bitrot * bad sector zfs set copies=2 hddpool Storing Multiple Copies of ZFS User Data text/html 2026-03-11T06:22:24+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:create?rev=1773210144&do=diff ZFS create <https://wiki.archlinux.org/title/ZFS> zfs create hddpool /dev/disk/by-id/ata-... zfs set aclinherit=passthrough hddpool zfs set acltype=posixacl hddpool zfs set xattr=sa hddpool zfs set canmount=off hddpool zfs create hddpool/backup zfs set relatime=on hddpool/backup zfs set mountpoint=/mnt/backup hddpool/backup zfs create -o canmount=noauto -o mountpoint=/mnt/backup hddpool/backup text/html 2021-07-05T10:58:51+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:dedup?rev=1625482731&do=diff ZFS Dedupliciation For deduplication, it is recommended to have L2ARC cache size of 2-5GB per 1TB of disk. * For every TB of pool data, you should expect 5 GB of dedup table data, assuming an average block size of 64K. * This means you should plan for at least 20GB of system RAM per TB of pool data, if you want to keep the dedup table in RAM, plus any extra memory for other metadata, plus an extra text/html 2025-08-03T05:39:20+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:draid?rev=1754199560&do=diff dRAID declustered RAID From ZFS RAID Level Considerations In a ZFS dRAID (declustered RAID) the hot spare drive(s) participate in the RAID. Their spare capacity is reserved and used for rebuilding when one drive fails. This provides, depending on the configuration, faster rebuilding compared to a RAIDZ in case of drive failure. More information can be found in the official OpenZFS documentation. [1] Note: dRAID is intended for more than 10-15 disks in a dRAID. A RAIDZ setup should be bett… text/html 2021-11-18T06:57:41+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:encryption?rev=1637218661&do=diff ZFS Encryption OpenZFS can compress single dataset. All childs will share the same encryption settings. zfs create -o encryption=on -o keylocation=prompt -o keyformat=passphrase rpool/data_enc Unlock: zfs load-key -r rpool/data_enc text/html 2021-03-16T07:00:20+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:monitoring?rev=1615878020&do=diff ZFS monitoring Munin plugins <https://gallery.munin-monitoring.org/keywords/zfs/> * zfs_list * Author: Adam Michel (elfurbe@furbism.com) * It generated lots of charts. One per dataset. It shows: * used by dataset * used by snapshots * used by children * used by ref reservation text/html 2025-04-06T19:08:23+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:mountpoints?rev=1743966503&do=diff Mountpoints change mountpoint zfs set mountpoint=none backupool zfs set mountpoint=none backupool/BACKUP zfs set mountpoint=/BACKUP backupool/BACKUP # disable auto mount zfs set canmount=noauto /pool/dataset allow user to mount datasets sudo zfs allow -u USER mount,mountpoint pool/path/to/prj text/html 2021-05-14T14:06:52+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:move_to_zfs?rev=1621001212&do=diff Move root to ZFS Based on Debian Buster Root on ZFS Additional references: * <https://www.tomica.net/blog/2019/02/moving-ubuntu-to-root-on-zfs/> * <https://blog.heckel.io/2016/12/31/move-existing-linux-install-zfs-root/> * ZFS - Debian Wiki Prepare system apt install --yes zfs-initramfs zfs-dkms Prepare new disk DISK=/dev/disk/by-id/scsi-SATA_disk1 sgdisk --zap-all $DISK sgdisk -a8 -n1:24K:+1000K -t1:EF02 $DISK # grub bios sgdisk -n2:1M:+256M -t2:EF00 $DISK # EFI sgdisk … text/html 2026-03-20T06:24:07+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:pool_features?rev=1773987847&do=diff zpool features zpool-features.7 * blake3 - This feature enables the use of the BLAKE3 hash algorithm for checksum and dedup * block_cloning - Block cloning allows to create multiple references to a single block. To use cp --reflink and other commands needing bclone support. text/html 2023-05-02T10:53:55+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:raidz?rev=1683024835&do=diff RAIDZ * RAIDZ-1 A variation on RAID-5, single parity. Requires at least 3 disks. * RAIDZ-2 A variation on RAID-5, double parity. Requires at least 4 disks. * RAIDZ-3 A variation on RAID-5, triple parity. Requires at least 5 disks. Space efficiency Adding more HDDs text/html 2023-01-30T08:10:15+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:replace?rev=1675066215&do=diff ZFS disc replace faulty special device Consider hddpool with special device as mirrors on 2 SSD partitions: NAME SIZE ALLOC FREE CKPOINT EXPANDSZ FRAG CAP DEDUP HEALTH ALTROOT hddpool 1.83T 294G 1.55T - - 22% 15% 1.00x DEGRADED - mirror-0 1.81T 291G 1.53T - - 22% 15.7% - ONLINE ata-TOSHIBA_HDW… text/html 2024-02-16T06:49:17+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:shrink?rev=1708066157&do=diff ZFS: resize zpool extend pool Get device name used in pool: zpool status nvmpool # resize /dev/nvme0n1p3 parted /dev/nvme0n1 resizepart 3 End ? [X.XGB]? quit zpool online -e nvmpool nvme0n1p3 ZFS: shrink zpool Shrinking of zpool is not possible, but trick with 2nd device (or even file) works: text/html 2021-10-12T08:30:28+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:swap?rev=1634027428&do=diff swap on ZFS zfs create -V 8G -b $(getconf PAGESIZE) -o compression=zle \ -o logbias=throughput -o sync=always \ -o primarycache=metadata -o secondarycache=none \ -o com.sun:auto-snapshot=false rpool/swap mkswap -f /dev/zvol/rpool/swap text/html 2026-04-14T19:43:03+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:tuning?rev=1776195783&do=diff ZFS performance tuning tips Copy-paste snippet: zfs set recordsize=1M rpool zfs set recordsize=16M hddpool zfs set recordsize=1M nvmpool zfs set compression=zstd rpool zfs set compression=zstd hddpool zfs set compression=zstd nvmpool Note: zstd means text/html 2025-01-07T10:34:45+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:zpool_rename?rev=1736246085&do=diff zpool rename Not possible directly, but: zpool export nvmpool zpool import nvmpool oldnvmpool -N -R /oldnvmpool text/html 2025-08-12T15:34:32+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:zpool_upgrade_features?rev=1755012872&do=diff zpool upgrade features ZFS 2.3.3: * redaction_list_spill * raidz_expansion * fast_dedup (still 1.25GiB RAM per 1TiB) * longname * large_microzap text/html 2021-04-18T13:26:49+00:00 Anonymous (anonymous@undisclosed.example.com) http://192.168.180.206:8001/linux:fs:zfs:zpool_upgrade?rev=1618752409&do=diff zpool upgrade Do not blindly upgrade boot volume when grub is used. Grub support limited set of zpool features! Or use systemd-boot and EFI partition. ~# zpool status nvmpool status: Some supported features are not enabled on the pool. The pool can still be used, but some features are unavailable. action: Enable all features using 'zpool upgrade'. Once this is done, the pool may no longer be accessible by software that does not support the features. See zpool-features(5) for details.