The API POST /storagepools/*pool*/storagevolumes requires the disk size in bytes and GB is used on UI. So do the proper convertion to bytes before sending the request to server. Signed-off-by: Aline Manera <alinefm(a)linux.vnet.ibm.com&gt; ---  ui/js/src/kimchi.guest_storage_add.main.js | 4 ++--  1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/ui/js/src/kimchi.guest_storage_add.main.js b/ui/js/src/kimchi.guest_storage_add.main.js index 29fccab..27f8f84 100644 --- a/ui/js/src/kimchi.guest_storage_add.main.js +++ b/ui/js/src/kimchi.guest_storage_add.main.js @@ -377,8 +377,8 @@ kimchi.guest_storage_add_main = function() {                      vol:  settings['vol'],                      pool: settings['pool']                  }; -                var sizeInMB = parseInt(settings['capacity']) * 1024; -                settings['capacity'] = sizeInMB; +                var sizeInBytes = parseInt(settings['capacity']) * 1024 * 1024 * 1024; +                settings['capacity'] = sizeInBytes;                  //These need to be deleted so they don't get passed to backend                  delete settings['path'];                  delete settings['newpool'];