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From "ASF GitHub Bot (JIRA)" <>
Subject [jira] [Commented] (CLOUDSTACK-9604) Root disk resize support for VMware and XenServer
Date Fri, 03 Mar 2017 07:44:45 GMT


ASF GitHub Bot commented on CLOUDSTACK-9604:

Github user rhtyd commented on the issue:
    @blueorangutan package

> Root disk resize support for VMware and XenServer
> -------------------------------------------------
>                 Key: CLOUDSTACK-9604
>                 URL:
>             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
> 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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