Actually, this is well described in the config option's documentation.
As of today:

    cfg.StrOpt('user_storage_quota', default='0',
               help=_("Set a system wide quota for every user. This value is "
                      "the total capacity that a user can use across "
                      "all storage systems. A value of 0 means unlimited."
                      "Optional unit can be specified for the value. Accepted "
                      "units are B, KB, MB, GB and TB representing "
                      "Bytes, KiloBytes, MegaBytes, GigaBytes and TeraBytes "
                      "respectively. If no unit is specified then Bytes is "
                      "assumed. Note that there should not be any space "
                      "between value and unit and units are case sensitive.")),

** Changed in: glance
   Importance: Undecided => Low

** Changed in: glance
       Status: New => Invalid

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https://bugs.launchpad.net/bugs/1469738

Title:
  The operation of create image has failed with not enough free quota
  storage although sufficient space was available

Status in OpenStack Image Registry and Delivery Service (Glance):
  Invalid

Bug description:
  Description of problem:
  Creating an image has failed with error message:"Denying attempt to upload 
image because it exceeds the quota", although there was enough space for upload 
the image

  Version-Release number of selected component (if applicable):
  python-glanceclient-0.17.0-2.el7ost.noarch
  python-glance-2015.1.0-6.el7ost.noarch
  python-glance-store-0.4.0-1.el7ost.noarch
  openstack-glance-2015.1.0-6.el7ost.noarch

  How reproducible:
  100%

  Steps to Reproduce:
  With only cirros image(size=12.6MB) run those steps
  1. Edit /etc/glance/glance-api.conf set user_storage_quota =1536000
  2. openstack-service restart glance
  3. Try to upload an image less than 1536000MB

  Actual results:
  Failed with 'Denying attempt to upload image because it exceeds the quota'

  Expected results:
  Creating an image should succeed 

  Additional info:
  It is similar to bug id=1043929
  Glance logs

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