'nova delete' causes of slowness by zeroing of instance logical volumes
Issue
- While using lvm for libvirt_images_type, it shows some slowness for deleting instances
- nova.conf has the below for the image type
libvirt_images_type=lvm
- During 'nova delete' operation, it shows lots of 'dd' processes and that takes lots of time to fill the LVM with zero
# ps aux | grep /bin/dd
root 62982 1.8 0.0 106212 1680 ? D 19:01 0:01 /bin/dd bs=1048576 if=/dev/zero of=/dev/novainstances/instance-000000de_disk seek=0 count=20480 oflag=direct
root 62991 1.9 0.0 106212 1680 ? D 19:01 0:01 /bin/dd bs=1048576 if=/dev/zero of=/dev/novainstances/instance-000000e1_disk seek=0 count=20480 oflag=direct
root 62998 1.8 0.0 106212 1680 ? D 19:01 0:01 /bin/dd bs=1048576 if=/dev/zero of=/dev/novainstances/instance-000000d2_disk seek=0 count=20480 oflag=direct
...
Environment
- Red Hat OpenStack 4
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