http://libvirt.org/formatsnapshot.html: if you specify snapshot='external', a new file will be created on the primary storage, which points to original disk. Then original disk will be read-only, we can back up this file to secondary storage.
> -----Original Message----- > From: Marcus Sorensen [mailto:shadow...@gmail.com] > Sent: Wednesday, September 26, 2012 3:29 PM > To: cloudstack-dev@incubator.apache.org > Subject: Re: [ASF40] [QA] Issue with volume Snapshot on KVM > > By external do you mean the qemu that comes with 6.3? In other words, > nothing has to be done for 6.3 other than removing/changing the check? > > On Wed, Sep 26, 2012 at 4:23 PM, Edison Su <edison...@citrix.com> wrote: > > The snapshot for KVM is not supported right now. > > In CS 3.x, we use patched qemu-kvm to take snapshot, and backup the > snapshot from qcow2 image to secondary storage. In ASF 4.x, we will not > patch qemu-kvm again. Instead, we will use external snapshot added in > 6.3. But it hasn't done yet, maybe in 4.1 release? > > > >> -----Original Message----- > >> From: Sowmya Krishnan [mailto:sowmya.krish...@citrix.com] > >> Sent: Wednesday, September 26, 2012 4:39 AM > >> To: cloudstack-dev@incubator.apache.org > >> Subject: [ASF40] [QA] Issue with volume Snapshot on KVM > >> > >> Hi, > >> > >> I am trying to take snapshot of volume on KVM (RHEL6.3) and I am > >> getting an exception that says it isn't supported: > >> > >> 2012-09-26 15:09:11,411 ERROR [cloud.api.ApiDispatcher] (Job- > Executor- > >> 16:job-27) Exception while executing CreateSnapshotCmd: > >> com.cloud.utils.exception.CloudRuntimeException: KVM Snapshot is not > >> supported on cluster: 5 > >> at > >> > com.cloud.storage.snapshot.SnapshotManagerImpl.createSnapshot(SnapshotM > >> anagerImpl.java:424) > >> at > >> > com.cloud.utils.component.ComponentLocator$InterceptorDispatcher.interc > >> ept(ComponentLocator.java:1231) > >> at > >> > com.cloud.storage.snapshot.SnapshotManagerImpl.createSnapshot(SnapshotM > >> anagerImpl.java:130) > >> at > >> > com.cloud.api.commands.CreateSnapshotCmd.execute(CreateSnapshotCmd.java > >> :155) > >> at > com.cloud.api.ApiDispatcher.dispatch(ApiDispatcher.java:138) > >> at > >> > com.cloud.async.AsyncJobManagerImpl$1.run(AsyncJobManagerImpl.java:432) > >> at > >> > java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471) > >> at > >> java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) > >> at java.util.concurrent.FutureTask.run(FutureTask.java:166) > >> at > >> > java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.ja > >> va:1110) > >> at > >> > java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.j > >> ava:603) > >> at java.lang.Thread.run(Thread.java:679) > >> > >> I am on build: Git Revision: > 995bab60385f7d663680ef6f5342056c6db3d305 > >> It's working fine on Ubuntu 12.04 and XS 6.0.2. > >> > >> Here's the DB extract of 'host' table on RHEL6.3 vs Ubuntu12.04: > >> > >> RHEL 6.3: > >> ======= > >> > >> mysql> select id, status, type, hypervisor_type, capabilities from > >> cloud.host; > >> +----+--------+--------------------+-----------------+-------------- > + > >> | id | status | type | hypervisor_type | capabilities > | > >> +----+--------+--------------------+-----------------+-------------- > + > >> | 1 | Up | Routing | KVM | hvm > | > >> | 2 | Alert | SecondaryStorage | None | NULL > | > >> | 3 | Up | SecondaryStorageVM | NULL | NULL > | > >> | 4 | Up | ConsoleProxy | NULL | NULL > | > >> | 5 | Up | Routing | KVM | hvm > | > >> +----+--------+--------------------+-----------------+-------------- > + > >> 5 rows in set (0.00 sec) > >> > >> Ubuntu 12.04: > >> =========== > >> > >> mysql> select id, status, type, hypervisor_type, capabilities from > >> cloud.host; > >> +----+--------+--------------------+-----------------+-------------- > + > >> | id | status | type | hypervisor_type | capabilities > | > >> +----+--------+--------------------+-----------------+-------------- > + > >> | 1 | Up | Routing | KVM | hvm > | > >> | 2 | Alert | SecondaryStorage | None | NULL > | > >> | 3 | Up | ConsoleProxy | NULL | NULL > | > >> | 4 | Up | SecondaryStorageVM | NULL | NULL > | > >> | 5 | Up | Routing | KVM | hvm,snapshot > | > >> | 6 | Up | Routing | KVM | hvm > | > >> +----+--------+--------------------+-----------------+-------------- > + > >> 6 rows in set (0.00 sec) > >> > >> > >> Am I missing any additional package to be installed for snapshot to > >> work on KVM? > >> > >> I have the following versions of qemu-img and qemu-kvm installed on > my > >> host: > >> > >> [root@rhel63 ~]# rpm -qa | grep qemu > >> gpxe-roms-qemu-0.9.7-6.9.el6.noarch > >> qemu-img-0.12.1.2-2.295.el6.x86_64 > >> qemu-kvm-0.12.1.2-2.295.el6.x86_64 > >> > >> Thanks, > >> Sowmya > >
