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IDProjectCategoryView StatusLast Update
0016791CentOS-8lvm2public2019-12-02 15:11
Reporterfirehill 
PrioritynormalSeveritymajorReproducibilityalways
Status newResolutionopen 
Product Version8.0.1905 
Target VersionFixed in Version 
Summary0016791: Poor LVM snapshot read performance
DescriptionLVM snapshot read performance is significantly degraded on CentOS 8 compared to CentOS 7.7.

For example on CentOS 8 a dd of a snapshot to /dev/null reports 39.8MB/s vs 145MB/s on CentOS 7.7. In contrast a dd of the origin gives 105MB/s on CentOS 8 and 99.5MB/s on CentOS 7.7.
Steps To Reproducelvcreate -s -l 10%FREE -n lvss /dev/vg/lv

dd if=/dev/vg/lvss of=/dev/null bs=262144
Tagslvm2 snapshot lvm

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Issue History

Date Modified Username Field Change
2019-12-02 15:11 firehill New Issue
2019-12-02 15:11 firehill Tag Attached: lvm2 snapshot lvm