thanks very much for your reply, could you please tell us: 1. if develop this “copy-on-write functionality”, how many lines of codes maybe needed？
2. if this tool is done, how many performance may be improved? best regards ________________________________ 陈甲 Chenjia M：+86-13301235534<tel:+86-13301235534> E：[email protected]<mailto:[email protected]> 产品与解决方案-安全基础平台开发部 Products & Solutions-Security Base Platform Development Dept 发件人： George Dunlap 收件人： Chenjia (C)<[email protected]<mailto:[email protected]>> 抄送： xen-devel<[email protected]<mailto:[email protected]>>;wangxu (R)<[email protected]<mailto:[email protected]>>;Shentao (Terry)<[email protected]<mailto:[email protected]>>;zhaobingjian<[email protected]<mailto:[email protected]>> 主题： Re: [Xen-devel] Is there a faster way to restore Virtual machine status in Xen? 时间： 2018-07-03 16:24:48 On Thu, Jun 14, 2018 at 2:26 AM, Chenjia (C) <[email protected]> wrote: > Dear XEN expert： > > We meet some problem in our project: In our previous project, we > use KVM, and we do some job like this: > > > > We create KVM snapshot by “virsh snapshot-create $DomainName $SnapshotXml”, > then do following job: > > While(1) > > { > > Run “virsh snapshot-revert $DomainName $Snapshot --running --force” > > Do some job in 30 secends > > } > > > > > > Now our project is move to Xen, so we need to do same thing like > in KVM, but we found that there is no “Snapshot” in xen , so we change the > job like this in xen: > > While(1) > > { > > Run “xl destroy win7_checkpointFile” > > Run “xl restore win7_checkpointFile” > > Do some job in 30 secends > > } > > > > We found that” xl destroy “and “xl restore” spend 10 times > longer than “virsh snapshot-revert”, it is unacceptable in our project > > > > So our question is that: Is there a faster way to restore > Virtual machine status in Xen? Internally Xen has the copy-on-write functionality needed to implement faster snapshots; but we don't have the tooling yet. If you're keen enough you could implement it -- but if you don't have the time / effort to do that I'm afraid you're out of luck. -George
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