On 4/25/19 8:59 AM, Wolf wrote: > Hi! > > I was reading the Wiki about 'Live Disk Backup with Active Blockcommit, > https://wiki.libvirt.org/page/Live-disk-backup-with-active-blockcommit > and see that example shown seems to be using two different names for the same > file. > > First showing the current block device in use: > $ virsh domblklist vm1 > Target Source > ------------------------------------------------ > vda /export/images/base.qcow2 > > Then copying the same file for backup: > $ cp /export/images/base.img /export/images/copy.img > > => Is there are reason why the block device first is called 'base.qcow2' and > then 'base.img'?
Nope. Fixed to favor .img throughout, to emphasize that the base image can be ANY format, not just qcow2. > > > I also saw another name that seems to be wrong based on the context. > It doesn't have the same implication as my earlier example, as the name of > the overlay file is not written in the command itself, but still: > ------ > $ virsh snapshot-create-as --domain vm1 guest-state1 \ > --diskspec vda,file=/export/images/overlay1.qcow2 \ > --disk-only --atomic > > Then: > $ virsh domblklist vm1 > Target Source > ------------------------------------------------ > vda /export/images/overlay.qcow2 > > Now that the backup is finished, perform active blockcommit by live mergning > contents of 'overlay1' into base . . . ." > ------ > > => Here it seems like the overlay file first is called ''overlay1.qcow2" and > the ' virsh domblklist vm1' command shows that it is actually called: > 'overlay.qcow2' > And then back to ''overlay1 in the following text: 'mergning contents of > 'overlay1' into base' > (Where 'mergning' is spelled wrong, but that doesn't affect the logic). Also fixed, here preferring overlay1.qcow2 since it is possible to create a chain of more than one overlay. > > > => Do I understand all this correctly? Yes, thanks for spotting the issues and reporting them. -- Eric Blake, Principal Software Engineer Red Hat, Inc. +1-919-301-3226 Virtualization: qemu.org | libvirt.org
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