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[Qemu-discuss] Question about incremental backup on raw disk

From: Zhan Adlun
Subject: [Qemu-discuss] Question about incremental backup on raw disk
Date: Sun, 19 May 2019 14:07:23 +0000

     I use dirty bitmap to backup  raw disks. I export a full raw disk on the 
first backup , then i export a qcow2 disk on the second incremental 
backup.During the backup,the vm is running with several files writing to 
disk(like 'cat /dev/urandom > file').  Then i mege the qcow2 disk to the raw 
disk, it works and all the datas are ok. I donot know it's by chance or not 
because a raw disk doesnot support COW feature. So could any tell me whether 
is's ok to use dirty bitmap to do incremental backup? Thanks.

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