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Aug 08, 2014 · $ sudo btrfs device delete missing /srv/tank $ sudo btrfs filesystem show Label: 'tank' uuid: 472ee2b3-4dc3-4fc1-80bc-5ba967069ceb Total devices 5 FS bytes used 1.08TB devid 3 size 1.82TB used 555.03GB path /dev/sdi devid 4 size 1.82TB used 555.03GB path /dev/sdj devid 5 size 465.76GB used 0.00 path /dev/sdk devid 2 size 1.82TB used 555.03GB ... # btrfs subvolume delete /mnt/ext2_saved At this point it is not possible to do a rollback. The filesystem is usable but may be MAKEFILEDATAMORECONTIGUOUSAn optional but recommended step is to run defragmentation on the entire filesystem. will attempt to make file extents more contiguous. # btrfs filesystem defrag -v -r -f -t 32M /mnt/btrfs Install Docker and BTRFS. yum install -y docker-engine btrfs-progs btrfs-progs-devel Configure BTRFS. By default the containers are created under the "/var/lib/docker", so you really need to house this on a separate disk or in a separate partition, preferably using BTRFS as the file system. I have a second LUN with a device named "/dev/sdb". Jan 07, 2019 · Page 2 of 4. 60 Comments. For the basic SQLite benchmark, to no surprise Btrfs with its default CoW behavior led to by far the slowest performance on all three drives. The fastest for the SATA/USB tests was XFS followed quickly by EXT4 and then F2FS. In the case of the Intel 900p SSD, the XFS results were too fast to accurately measure while EXT4 and F2FS took just two seconds to complete while Btrfs took six seconds. Nov 04, 2020 · BTRFS is a Linux filesystem that has been adopted as the default filesystem in some popular versions of Linux. It is based on copy-on-write, allowing for efficient snapshots and clones. It uses B ... 1) How can I remove an old/uninstalled device from the kids profile, there is no Remove option anywhere? 2) I also noticed that devices show up with their default Android name in the Locator/GPS section, even when they were renamed with a more friendly name (Kid1 Phone)? The Btrfs filesystem has many advanced features, including subvolumes, pooling, snapshots, and copy-on-write. In this video, learn about these features as well as best practices. Copy the contents of the remaining device mounted degraded,ro into the new Btrfs filetreee on the new device. Unmount the remaining device, and btrfs device add -f it to the new device, and convert the profile of the new filetree back to raid1. The raid5 profile allows 1 or more member devices. With 1 or 2 member devices there is an implicit ... * New Bazaar snapshot. - Add btrfs probing support, currently only in the single-device case (closes: #540786). - Fix grub-emu build on mips/powerpc/sparc. - Add safety check to make sure that /boot/grub/locale exists before trying to probe it (closes: #567211). Btrfs has self-healing features and have the capability of spanning multiple volumes. In Btrfs we can shrink, grow the file-system, add or remove block device in online mode. It also provides subvolumes, Subvolumes are not a separate block devices, we can create snapshots and restore the snapshot for those subvolumes.The device management works on a mounted filesystem. Devices can be added, removed or replaced, by commands provided by btrfs device and btrfs replace. The profiles can be also changed, provided there's enough workspace to do the conversion, using the btrfs balance command and namely the filter convert.Btrfs block management relies on grouping of blocks into block groups, with each group composed of one or more device extent. The device extents of a block group may belong to different devices (e.g. In the case of a RAID volume). The btrfs filesystem also has TRIM/Discard support for SSD storage devices. The TRIM feature can detect and mark data extents that are no longer used. Once the extends are marked, the btrfs filesystem can wipe them automatically so that the other files can use these data extents. The Discard feature will remove all the data extends of the SSD.