Thanks Harikrishna! If I understand this correctly, this will only reset the disk only when the VM is rebooted via the CloudStack API. I was able to confirm that the disk was indeed reset if I send the reboot API call.
What confused me based on what is written in the documentation is that the VM disk would not reset in the following cases: 1. The user powers down the VM (via the shutdown/poweroff commands in the OS) and at a later time turns the VM back on using the CloudStack 'start virtualmachine' API command. 2. The user powers down the VM via the 'stop virtualmachine' CloudStack API call and at a later time turns the VM back on using the CloudStack 'start virtualmachine' API command. 3. The user reboots the VM (via the reboot command) Is it a bug that the disk doesn't get reset in the first 2 cases? That is, shouldn't the 'start virtualmachine' command trigger the disk to reset on a volatile VM? Thank-you, -Leo > On 03/17/2024 9:53 PM MDT Harikrishna Patnala > <harikrishna.patn...@shapeblue.com> wrote: > > > Previous link may not open for you, please check this snippet > > https://github.com/apache/cloudstack/blob/2df68021761adbd93eecda20114894c8f2edb8bd/server/src/main/java/com/cloud/vm/UserVmManagerImpl.java#L3239-L3248 > > > > From: Harikrishna Patnala <harikrishna.patn...@shapeblue.com> > Date: Monday, 18 March 2024 at 9:19 AM > To: users@cloudstack.apache.org <users@cloudstack.apache.org> > Subject: Re: Volatile VM disks? > Hi Leo, > > Here is the code snippet which handles the volume reset on reboot VM. > https://github.com/shapeblue/cloudstack/blob/2df68021761adbd93eecda20114894c8f2edb8bd/server/src/main/java/com/cloud/vm/UserVmManagerImpl.java#L3239-L3248 > > May I know how did you test the volume reset, please try reboot after having > some data in the volume which is created after the volume creation. From UI > if you look at the volume name and details there won’t be any change, it’s > the data which gets reset inside the volume. > > Thanks, > Harikrishna > > From: Leo Leung <l...@steamr.com> > Date: Saturday, 16 March 2024 at 2:50 AM > To: users@cloudstack.apache.org <users@cloudstack.apache.org> > Subject: Volatile VM disks? > Hello everyone, > > I am trying to use the 'volatile VM' feature. According to the documentation, > it should "have their root disks reset upon reboot". > > I created a new compute offering with 'volatile' enabled and then deployed a > VM on a KVM node using a template image. The VM root disk is not resetting on > shutdown/reboot. I looked through the CloudStack source code but don't see > anything obvious as to what would make the disks reset on shutdown/reboot. > > Is there something else I need to do to make this work? Is this a feature > only on specific hypervisors? > > Thank-you, > -Leo
