Periodic tasks incurs IO performance penalty with LVM imagebackend
Affects | Status | Importance | Assigned to | Milestone | |
---|---|---|---|---|---|
OpenStack Compute (nova) |
Fix Released
|
Undecided
|
Qiu Yu |
Bug Description
Using LVM as image backend, periodic tasks (update_
# iostat -x 1 /dev/sda
avg-cpu: %user %nice %system %iowait %steal %idle
3.01 0.00 2.59 0.50 0.00 93.90
Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util
sda 0.00 1.00 2931.00 9.00 23982.00 88.00 8.19 0.11 0.04 0.04 10.70
# dstat -tcd --top-io --top-cpu
----system---- ----total-
date/time |usr sys idl wai hiq siq| read writ| i/o process | cpu process
20-02 17:24:32| 3 3 94 0 0 0| 0 0 |SCREEN 2717k 8182B|nova-compute 0.2
20-02 17:24:33| 5 4 91 1 0 0| 11M 32k|nova-comput 15M 7661B|libvirtd 0.6
20-02 17:24:34| 9 4 87 0 0 0|4322k 4096B|nova-
20-02 17:24:35| 10 3 88 0 0 0| 0 0 |libvirtd 12k 225k|libvirtd 8.3
20-02 17:24:36| 10 4 86 0 0 0| 0 0 |nova-comput 269k 15k|libvirtd 8.4
20-02 17:24:37| 8 3 88 0 0 0|3997k 8192B|nova-
20-02 17:24:38| 3 3 94 0 0 0|3997k 4096B|nova-
Changed in nova: | |
assignee: | nobody → unicell (unicell) |
Changed in nova: | |
milestone: | none → grizzly-3 |
status: | Fix Committed → Fix Released |
Changed in nova: | |
milestone: | grizzly-3 → 2013.1 |
Fix proposed to branch: master /review. openstack. org/22432
Review: https:/