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https://issues.apache.org/jira/browse/CLOUDSTACK-9604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15869618#comment-15869618
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ASF GitHub Bot commented on CLOUDSTACK-9604:
--------------------------------------------

Github user borisstoyanov commented on the issue:

    https://github.com/apache/cloudstack/pull/1813
  
    @blueorangutan test centos7 xenserver-65sp1


> 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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