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减少qcow文件大小
int32位
posted @ Mar 22, 2016 04:00:02 PM
in openstack
, 2212 阅读
转载请注明：http://krystism.is-programmer.com/若有错误，请多多指正，谢谢！
转载请注明：http://krystism.is-programmer.com/若有错误，请多多指正，谢谢！
当做虚拟机备份快照时，镜像的大小一般会大于实际数据大小，you'll need to zero out all free space of the partitions contained within the guest first.
参考维基百科:https://pve.proxmox.com/wiki/Shrin_Qcow2_Disk_Files
针对linux镜像:
1. 删除无用文件
尽量删除一些无用文件
2. Zero out磁盘
dd if=/dev/zero of=/mytempfile
# that could take a some time
rm -f /mytempfile
3.减少磁盘大小
备份
mv image.qcow2 image.qcow2_backup
#1: Shrink your disk without compression (better performance, larger disk size):
qemu-img convert -O qcow2 image.qcow2_backup image.qcow2
#2: Shrink your disk with compression (smaller disk size, takes longer to shrink, performance impact on slower systems):
qemu-img convert -O qcow2 -c image.qcow2_backup image.qcow2
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