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Gregor Kopka b954e36e51 Zpool iostat: remove latency/queue scaling 
Bandwidth and iops are average per second while *_wait are averages
per request for latency or, for queue depths, an instantaneous
measurement at the end of an interval (according to man zpool).

When calculating the first two it makes sense to do
x/interval_duration (x being the increase in total bytes or number of
requests over the duration of the interval, interval_duration in
seconds) to 'scale' from amount/interval_duration to amount/second.

But applying the same math for the latter (*_wait latencies/queue) is
wrong as there is no interval_duration component in the values (these
are time/requests to get to average_time/request or already an
absulute number).

This bug leads to the only correct continuous *_wait figures for both
latencies and queue depths from 'zpool iostat -l/q' being with
duration=1 as then the wrong math cancels itself (x/1 is a nop).

This removes temporal scaling from latency and queue depth figures.

Reviewed-by: Tony Hutter <hutter2@llnl.gov>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Gregor Kopka <gregor@kopka.net>
Closes #7945 
Closes #7694
2018-09-25 16:29:16 -07:00
.github Add new wiki page to CONTRIBUTING 2018-09-18 08:58:15 -07:00
cmd Zpool iostat: remove latency/queue scaling 2018-09-25 16:29:16 -07:00
config Fix statfs(2) for 32-bit user space 2018-09-24 17:11:25 -07:00
contrib pyzfs: add missing libzfs_core functions 2018-08-20 10:11:52 -07:00
etc Minor documentation, logging, and testing typos 2018-06-07 09:38:39 -07:00
include Fix statfs(2) for 32-bit user space 2018-09-24 17:11:25 -07:00
lib Pool allocation classes 2018-09-05 18:33:36 -07:00
man Fix reference to zpool-features(5) 2018-09-21 09:41:08 -07:00
module Fix statfs(2) for 32-bit user space 2018-09-24 17:11:25 -07:00
rpm Remove %changelog from spec file 2018-08-26 12:59:33 -07:00
scripts Direct IO support 2018-08-27 10:04:21 -07:00
tests Revert "Fix flake 8 style warnings" 2018-09-24 17:20:42 -07:00
udev Add kernel module auto-loading 2018-03-13 10:45:55 -07:00
.gitignore Ignore *.o.ur-safe build artifacts 2018-05-13 18:59:02 -07:00
.gitmodules Add zimport.sh compatibility test script 2014-02-21 12:10:31 -08:00
.travis.yml Add .travis.yml 2017-11-13 09:18:18 -08:00
AUTHORS Update build system and packaging 2018-05-29 16:00:33 -07:00
autogen.sh Cause autogen.sh to fail if autoreconf fails 2018-07-06 09:27:37 -07:00
configure.ac Pool allocation classes 2018-09-05 18:33:36 -07:00
copy-builtin copy-builtin: SPL must be in Kbuild first 2018-06-15 15:16:29 -07:00
COPYRIGHT Update build system and packaging 2018-05-29 16:00:33 -07:00
LICENSE Update build system and packaging 2018-05-29 16:00:33 -07:00
Makefile.am Add NEWS file 2018-09-18 12:03:47 -07:00
META Tag 0.8.0-rc1 2018-09-07 09:35:09 -07:00
NEWS Add NEWS file 2018-09-18 12:03:47 -07:00
NOTICE Update build system and packaging 2018-05-29 16:00:33 -07:00
README.md Explicitly state supported Linux versions 2018-05-30 20:11:19 -07:00
TEST Update build system and packaging 2018-05-29 16:00:33 -07:00
zfs.release.in Move zfs.release generation to configure step 2012-07-12 12:22:51 -07:00

README.md

img

ZFS on Linux is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community.

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Official Resources

Installation

Full documentation for installing ZoL on your favorite Linux distribution can be found at our site.

Contribute & Develop

We have a separate document with contribution guidelines.

Release

ZFS on Linux is released under a CDDL license.
For more details see the NOTICE, LICENSE and COPYRIGHT files; UCRL-CODE-235197

Supported Kernels

  • The META file contains the officially recognized supported kernel versions.