There is a command group 'az_vmss_disk'. This group of commands could 'manage data disks of a vmss'. The group of commands has global parameter '--debug' which means 'Increase logging verbosity to show all debug logs.'. The group of commands has global parameter '--help -h' which means 'Show this help message and exit.'. The group of commands has global parameter '--only-show-errors' which means 'Only show errors, suppressing warnings.'. The group of commands has global parameter '--output -o' which means 'Output format.'. The group of commands has global parameter '--query' which means 'JMESPath query string. See <a href="http://jmespath.org/">http://jmespath.org/</a> for more information and examples.'. The group of commands has global parameter '--subscription' which means 'Name or ID of subscription. You can configure the default subscription using `az account set -s NAME_OR_ID`.'. The group of commands has global parameter '--verbose' which means 'Increase logging verbosity. Use --debug for full debug logs.'. This group contains a child command 'az_vmss_disk_attach'.The syntax is: az vmss disk attach [--caching {none, readonly, readwrite}]
                    [--disk]
                    [--ids]
                    [--instance-id]
                    [--lun]
                    [--resource-group]
                    [--size-gb]
                    [--sku {premium_lrs, standardssd_lrs, standard_lrs, ultrassd_lrs}]
                    [--subscription]
                    [--vmss-name]. The 1th example of the child command would be to use it to 'attach managed data disks to a scale set or its instances   autogenerated', the syntax is: az vmss disk attach --disk {disk} --instance-id 0 --resource-group MyResourceGroup. The 2th example of the child command would be to use it to 'attach managed data disks of a given size to a scale set or its instances   autogenerated', the syntax is: az vmss disk attach --vmss-name MyVmss --resource-group MyResourceGroup --size-gb 50. The parameter '--caching' is optional. disk caching policy.. The parameter '--disk' is optional. existing disk name or id to attach or detach from vm instances.. The parameter '--ids' is optional. one or more resource ids (space-delimited). it should be a complete resource id containing all information of 'resource id' arguments. you should provide either --ids or other 'resource id' arguments.. The parameter '--instance-id' is optional. scale set vm instance id.. The parameter '--lun' is optional. 0-based logical unit number (lun). max value depends on the virtual machine instance size.. The parameter '--resource-group -g' is optional. name of resource group. you can configure the default group using `az configure --defaults group=<name>`.. The parameter '--size-gb -z' is optional. size in gb. max size: 4095 gb (certain preview disks can be larger).. The parameter '--sku' is optional. underlying storage sku.. The parameter '--subscription' is optional. name or id of subscription. you can configure the default subscription using `az account set -s name_or_id`.. The parameter '--vmss-name' is optional. scale set name. you can configure the default using `az configure --defaults vmss=<name>`.. 