proxmox-mirrors/pve-docs
1
0
Fork 0
mirror of https://git.proxmox.com/git/pve-docs synced 2026-02-01 21:26:49 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

Add section 'Compression in ZFS'

Browse Source 
Signed-off-by: Fabian Ebner <f.ebner@proxmox.com>
This commit is contained in:
Fabian Ebner 2020-01-16 13:15:44 +01:00 committed by Thomas Lamprecht
parent b03b8bb6c3
commit e06707f2d1
1 changed files with 30 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

31
local-zfs.adoc
View File

@ -180,7 +180,7 @@ underlying disk.
zpool create -f -o ashift=12 <pool> <device>
To activate compression
To activate compression (see section <<zfs_compression,Compression in ZFS>>):
zfs set compression=lz4 <pool>
@ -433,6 +433,35 @@ change-key` commands and the `Encryption` section from `man zfs` for more
details and advanced usage.
[[zfs_compression]]
Compression in ZFS
~~~~~~~~~~~~~~~~~~
When compression is enabled on a dataset, ZFS tries to compress all *new*
blocks before writing them and decompresses them on reading. Already
existing data will not be compressed retroactively.
You can enable compression with:
----
# zfs set compression=<algorithm> <dataset>
----
We recommend using the `lz4` algorithm, because it adds very little CPU
overhead. Other algorithms like `lzjb` and `gzip-N`, where `N` is an
integer from `1` (fastest) to `9` (best compression ratio), are also
available. Depending on the algorithm and how compressible the data is,
having compression enabled can even increase I/O performance.
You can disable compression at any time with:
----
# zfs set compression=off <dataset>
----
Again, only new blocks will be affected by this change.
ZFS Special Device
~~~~~~~~~~~~~~~~~~