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https://issues.apache.org/jira/browse/CLOUDSTACK-9604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15948904#comment-15948904
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ASF GitHub Bot commented on CLOUDSTACK-9604:
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Github user priyankparihar commented on the issue:
https://github.com/apache/cloudstack/pull/1813
>I'm happy that you agree with my comments, as far as resizing root disk
for runnign VM, I think checking both full.clone and root.disk.controller
global settings puts us in a good position to make the option available or not.
By any chance if the user has made a change and changed the RootDiskController,
he would be notified with exception and that would ring a bell to him. I think
Cloudstack brings an abstraction when using hypervisors and it's generally good
for the product when users use more CloudStack features instead of relying on
the Hypervisor to get work done.
@serg38, @pdube and @sateesh-chodapuneedi. Should i write additional API
for extracting all these details in case of running VM or is there any
alternative to achieve this functionality ? What is your opinion ?
> Root disk resize support for VMware and XenServer
> -------------------------------------------------
>
> Key: CLOUDSTACK-9604
> URL: https://issues.apache.org/jira/browse/CLOUDSTACK-9604
> Project: CloudStack
> Issue Type: Improvement
> Security Level: Public(Anyone can view this level - this is the
> default.)
> Reporter: Priyank Parihar
> Assignee: Priyank Parihar
> Attachments: 1.png, 2.png, 3.png
>
>
> Currently the root size of an instance is locked to that of the template.
> This creates unnecessary template duplicates, prevents the creation of a
> market place, wastes time and disk space and generally makes work more
> complicated.
> Real life example - a small VPS provider might want to offer the following
> sizes (in GB):
> 10,20,40,80,160,240,320,480,620
> That's 9 offerings.
> The template selection could look like this, including real disk space used:
> Windows 2008 ~10GB
> Windows 2008+Plesk ~15GB
> Windows 2008+MSSQL ~15GB
> Windows 2012 ~10GB
> Windows 2012+Plesk ~15GB
> Windows 2012+MSSQL ~15GB
> CentOS ~1GB
> CentOS+CPanel ~3GB
> CentOS+Virtualmin ~3GB
> CentOS+Zimbra ~3GB
> CentOS+Docker ~2GB
> Debian ~1GB
> Ubuntu LTS ~1GB
> In this case the total disk space used by templates will be 828 GB, that's
> almost 1 TB. If your storage is expensive and limited SSD this can get
> painful!
> If the root resize feature is enabled we can reduce this to under 100 GB.
> Specifications and Description
> Administrators don't want to deploy duplicate OS templates of differing
> sizes just to support different storage packages. Instead, the VM deployment
> can accept a size for the root disk and adjust the template clone
> accordingly. In addition, CloudStack already supports data disk resizing for
> existing volumes, we can extend that functionality to resize existing root
> disks.
> As mentioned, we can leverage the existing design for resizing an existing
> volume. The difference with root volumes is that we can't resize via disk
> offering, therefore we need to verify that no disk offering was passed, just
> a size. The existing enforcements of new size > existing size will still
> server their purpose.
> For deployment-based resize (ROOT volume size different from template
> size), we pass the rootdisksize parameter when the existing code allocates
> the root volume. In the process, we validate that the root disk size is >
> existing template size, and non-zero. This will persist the root volume as
> the desired size regardless of whether or not the VM is started on deploy.
> Then hypervisor specific code needs to be made to pay attention to the
> VolumeObjectTO's size attribute and use that when doing the work of cloning
> from template, rather than inheriting the template's size. This can be
> implemented one hypervisor at a time, and as such there needs to be a check
> in UserVmManagerImpl to fail unsupported hypervisors with
> InvalidParameterValueException when the rootdisksize is passed.
>
> Hypervisor specific changes
> XenServer
> Resize ROOT volume is only supported for stopped VMs
> Newly created ROOT volume will be resized after clone from template
> VMware
> Resize ROOT volume is only supported for stopped VMs.
> New size should be large then the previous size.
> Newly created ROOT volume will be resized after clone from template iff
> There is no root disk chaining.(means use Full clone)
> And Root Disk controller setting is not IDE.
> Previously created Root Volume could be resized iif
> There is no root disk chaining.
> And Root Disk controller setting is not IDE.
> Web Services APIs
> resizeVolume API call will not change, but it will accept volume UUIDs of
> root volumes in id parameter for resizing.
> deployVirtualMachine API call will allow new rootdisksize parameter to be
> passed. This parameter will be used as the disk size (in GB) when cloning
> from template.
> UI
> 1) (refer attached image 1) shows UI that resize volume option is added for
> ROOT disks.
> 2) (refer attached image 2) when user calls the resize volume on ROOT volume.
> Here only size option is shown. For DATADISK disk offerings are shown.
> 3) (refer attached image 3) when user deploys VM. New option for Root disk
> size is added.
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