14

Testing btrfs compress option

view full story
linux-howto

https://bbs.archlinux.org – When using the compress mount option, there's usually a message in dmesg with btrfs recognizing that compression is enabled.I guess one way to confirm compression is enabled is to do something likedd if=/dev/zero of=file bs=1M count=1024 btrfs fi sync /btrfsmountpoint du -h file then check the file size.Also, I think it should be lzo and not Lzo. I'm not sure if it's case sensitive. And AFAIK lzo is now default compression algorithm in btrfs, so =lzo shouldn't be needed. Furthermore, if your HDD is REALLY abysmal as you say, you can try using zlib instead of lzo as it has h (HowTos)

Songlist's picture
Submitted by Songlist on 04/02/2012 – Made popular on 04/02/2012

Stories similar to Testing btrfs compress option

I would like to make use of Btrfs' transparent compression on an external drive.

Which tool is best for formatting the drive? Disk Utility or GParted? How do I activate the compression? During formatting or when I mount the drive? I guess at mount time. I'm using usbmount to automatically mount newly attached devices, because nobody is logged in on the desktop.

hi,

i installed ubuntu 11.10 after spending some time with Arch and Gentoo (DIY distro sounds good but theres always something to overlook/forget)

anyways

i have BTRFS / and /home partitions (ext2 /boot) and just added compress=lzo to my fstab to see if there was a noticeable performance gain (after a few updates all the files should have been modified and therefor compressed right?)

so my opt

A Beginner's Guide To btrfs 25 weeks 2 days ago

A Beginner's Guide To btrfs

This guide shows how to work with the btrfs file system on Linux. It covers creating and mounting btrfs file systems, resizing btrfs file systems online, adding and removing devices, changing RAID levels, creating subvolumes and snapshots, using compression and other things.

Quote:

The advanced Butter/Better/B-tree Filesystem, Btrfs, is still labeled as experimental in the Btrfs Wiki and on Oracle's Btrfs page though the Oracle page looks outdated.

Linux Mint 10 is the first version of Linux Mint with built-in support for the B-tree File System (btrfs). Btrfs is one of the newest file systems in the Linux kernel. It is a copy on write file system with the following features: snapshotting and writtable snapshots, object-level mirroring and stripping, file system compression, multi-device [...]

My root filesystem is btrfs, on device sdc1, subvolume "@root", which is also the default subvolume:

Code: :~$ mount -l /dev/sdc1 on / type btrfs (rw,compress) -snip-

:~$ sudo btrfs subvolume list -a / ID 256 gen 18200 top level 5 path <FS_TREE>/@root -snip-

:~$ sudo btrfs subvolume get-default / ID 256 gen 18202 top level 5 path <FS_TREE>/@root

:~$ ca

Fedora 15, the latest stable release of the Red Hat-sponsored Linux distribution, is the first Fedora release to have btrfs, the B-tree File System (also called Butter F S), as a file system option during the installation process. On earlier versions, you would have had to pass the btrfs option to Anaconda at boot time [...]

The idea of subvolumes defeats the purpose of separate partitions, those are soo 2001.Format it with GPT, create a subvol for / so you can do easy snapshotting and fallback.Don't put /var into a separate subvol as it contains your pacman db.But definately one for /home.And compress=lzo for all of them, the compression is smart and will not bother trying to compress things that can't be c

I have access to a server via SSH, I download files from it over SFTP or HTTP. I want to pull down a 4.4GB .mkv file but I have limited bandwidth.

I have used zip, gzip and p7zip, but the file is always 4.4GBs after the compression process. After fiddling with some of the CLI args I managed on one attempt to get the file down to 4.3GBs.