Date: Wed, 4 Apr 2018 12:21:51 +0500 From: "Eugene M. Zheganin" <eugene@zhegan.in> To: freebsd-stable@FreeBSD.org Subject: another question about zfs compression numbers Message-ID: <52b1c557-bdb5-3b9f-1ce1-32f698ae982c@zhegan.in>
next in thread | raw e-mail | index | archive | help
Hello,
I'm just trying to understand these numbers:
file size is 232G, it's actual size on the lz4-compressed dataset is
18G, so then why is the compressratio only 1.86x ? And why logicalused
is 34.2G ? On one hand, 34.2G exactlyfits to the 1.86x compresstaio, but
still I don't get it. dataset is on raidz, 3 spans across 5 disk vdevs,
with total of 15 disks if it matters:
# du -h
18G .
# ls -lh
total 19316318
-rw-r----- 1 root wheel 232G 4 апр. 11:29 mp_userCoordsHistory.ibd
# zfs get all data/test
NAME PROPERTY VALUE SOURCE
data/test type filesystem -
data/test creation ср апр. 4 10:31 2018 -
data/test used 18,4G -
data/test available 9,95T -
data/test referenced 18,4G -
data/test compressratio 1.86x -
data/test mounted yes -
data/test quota none default
data/test reservation none default
data/test recordsize 128K default
data/test mountpoint /data/test default
data/test sharenfs off default
data/test checksum on default
data/test compression lz4 local
data/test atime on default
data/test devices on default
data/test exec on default
data/test setuid on default
data/test readonly off default
data/test jailed off default
data/test snapdir hidden default
data/test aclmode discard default
data/test aclinherit restricted default
data/test canmount on default
data/test xattr off temporary
data/test copies 1 default
data/test version 5 -
data/test utf8only off -
data/test normalization none -
data/test casesensitivity sensitive -
data/test vscan off default
data/test nbmand off default
data/test sharesmb off default
data/test refquota none default
data/test refreservation none default
data/test primarycache all default
data/test secondarycache all default
data/test usedbysnapshots 0 -
data/test usedbydataset 18,4G -
data/test usedbychildren 0 -
data/test usedbyrefreservation 0 -
data/test logbias latency default
data/test dedup on inherited from data
data/test mlslabel -
data/test sync standard default
data/test refcompressratio 1.86x -
data/test written 18,4G -
data/test logicalused 34,2G -
data/test logicalreferenced 34,2G -
data/test volmode default default
data/test filesystem_limit none default
data/test snapshot_limit none default
data/test filesystem_count none default
data/test snapshot_count none default
data/test redundant_metadata all default
# zpool status
pool: data
state: ONLINE
scan: scrub repaired 0 in 28h24m with 0 errors on Thu Feb 15 13:26:36
2018
config:
NAME STATE READ WRITE CKSUM
data ONLINE 0 0 0
raidz1-0 ONLINE 0 0 0
da2 ONLINE 0 0 0
da3 ONLINE 0 0 0
da4 ONLINE 0 0 0
da5 ONLINE 0 0 0
da6 ONLINE 0 0 0
raidz1-1 ONLINE 0 0 0
da7 ONLINE 0 0 0
da8 ONLINE 0 0 0
da9 ONLINE 0 0 0
da10 ONLINE 0 0 0
da11 ONLINE 0 0 0
raidz1-2 ONLINE 0 0 0
da12 ONLINE 0 0 0
da13 ONLINE 0 0 0
da14 ONLINE 0 0 0
da15 ONLINE 0 0 0
da16 ONLINE 0 0 0
Want to link to this message? Use this URL: <https://mail-archive.FreeBSD.org/cgi/mid.cgi?52b1c557-bdb5-3b9f-1ce1-32f698ae982c>