palashgandhi opened a new pull request #1372: Fix Azure compute driver to allow 
adding maximum number of disks when LUN is unspecified
URL: https://github.com/apache/libcloud/pull/1372
 
 
   ## Fix Azure compute driver to allow adding maximum number of disks when LUN 
is unspecified
   
   ### Description
   
   When the LUN is unspecified in the `attach_volume` method, it finds the 
lowest available number to attach the volume to. The maximum number of data 
disks on an Azure VM is 64, which means LUNs can range from 0 to 63.
   
   The current logic to figure out the LUN iterates from 0 to 62: `for lun in 
range(0, 63)`. When you try to add the Nth device where N = maximum number of 
data disks allowed for that instance size, this code raises `LibcloudError("No 
LUN available to attach new disk.")`.
   
   This PR fixes this to ensure the last LUN is usable.
   
   ### Status
   
   - done, ready for review
   
   ### Checklist (tick everything that applies)
   
   - [x] [Code 
linting](http://libcloud.readthedocs.org/en/latest/development.html#code-style-guide)
 (required, can be done after the PR checks)
   - [x] Documentation
   - [] [Tests](http://libcloud.readthedocs.org/en/latest/testing.html)
   - [x] 
[ICLA](http://libcloud.readthedocs.org/en/latest/development.html#contributing-bigger-changes)
 (required for bigger changes)
   

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