Description of problem:
Storage test failed on Boxboro-EX RHEL6 x86_64.
<output>
Running ./storage.py:
--------------------------------------------
*** Testing raw I/O performance on dm-1
Traceback (most recent call last):
  File "./storage.py", line 476, in <module>
    returnValue = test.do(sys.argv)
  File "/usr/share/v7/lib/v7/test.py", line 260, in do
    return self.run()
  File "./storage.py", line 449, in run
    returnValue = self.testRawIO(storageDevice,testdev,minBs,maxBs)
  File "./storage.py", line 370, in testRawIO
    if self.dtTest(minBs,maxBs,rawTestFile,size,otherOptions):
  File "./storage.py", line 111, in dtTest
    size = string._int(devSize)
ValueError: invalid literal for int() with base 10: ''
...finished running ./storage.py, exit code=1
</output>


Version-Release number of selected component (if applicable):
[root@intel-s3e36-01 tmp]# v7 version
V7 version 1.2, release 14


How reproducible:
Always

Steps to Reproduce:
1.Install v7-1.2-14.
2.v7 run --test storage