What are your disk space savings when using btrfs with compression?
I have a 200 GB btrfs filesystem which uses compress=zlib, only stores
text files (logs), mostly multi-gigabyte files.
It's a "single" filesystem, so "df" output matches "btrfs fi df":
# df -h
Filesystem Size Used Avail Use% Mounted on
(...)
/dev/xvdb 200G 124G 76G 62% /var/log/remote
# du -sh /var/log/remote/
153G /var/log/remote/
From these numbers (124 GB used where data size is 153 GB), it appears
that we save around 20% with zlib compression enabled.
Is 20% reasonable saving for zlib? Typically text compresses much better
with that algorithm, although I understand that we have several
limitations when applying that on a filesystem level.
Tomasz Chmielewski
http://wpkg.org
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