On 03/21/2016 04:18 AM, Maxim Nestratov wrote: > Hi all, > > It's been already quite a long time since qemu implemented QMP > "drive-backup" command to create block devices backups. Even more, since > qemu 2.4 there is a possibility to create incremental backups. Though it > is possible to backup all attached to a domain disk drives by combining > them into a single QMP transaction command, this way of creating them, > not to mention managing, remains inconvenient for an end user of > libvirt. Moreover, creating a single drive backup via QMP interface > isn't handy either. That said, it looks reasonable to introduce a *new > backup API* based on QMP "drive-backup" facilities. > > Though we can start from a single simple function, allowing to create a > disk backup by means of QMP "drive-backup" command, I'd like to discuss > here the level of management libvirt could provide for backup > operations. To begin with, here is the preliminary list of possible > functions that I think make sense for libvirt API. > > virDomainCreateBackup - which creates a backup full/incremental of > all/selected disks, I'm also wondering if it would be better to just add a new flag to our existing virDomainBlockCopy() that specifies backup semantics (the current default creates the block copy at the point in time that the job is _ended_; whereas drive-backup creates the block copy at the oin in time where the job is _started_), rather than needing new API. > virListBackups - which lists all backups created for a particular > domain/target, > virRestoreBackup - which restores all/selected disks from a backup, > virDeleteBackup - which deletes all/selected disks from a backup. And here, I think that the existing virDomainSnapshot* API may already fit this need, if we could more closely couple the act of creating snapshots/backups with the act of disk backups. -- Eric Blake eblake redhat com +1-919-301-3266 Libvirt virtualization library http://libvirt.org
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