Below is the reply from the Cisco engineer:
This is a side affect of the fix for CSCin68259 which was done in IDU 8.0 and DEs are looking into the problem now. You will get this error image verification when the image you are uploading is a tar image and the current image has CMS copied to flash.
SWIM verifies if the minimum flash size requirement of the image selected during the recommendation screen is met or not. This minimum flash size requirement is obtained from Cisco.com if the selected image is from Cisco.com. In this case, since we get 4MB as the min flash size requirement for 12.0(5)WC9a but flash device size is only 3.6MB, verification fails.
If you upload a bin image, you will get the message about overwriting the current image and you can continue the job. In case of bin file, SWIM is able to decide whether image can fit in the flash. In case of tar file, SWIM does not know the exploded size of the tar file, so SWIM has no way of knowing whether the image+CMS files will fit on flash or not. It has to use the filesize on Cisco.com and this is larger than your available space on flash.
Here is a temporary workaround:
- Download the image from Cisco.com into SWIM library and manually edit the min flash size requirement to <4MB.
Bug CSCin68259 was filed for the following scenario:
If the size of target image (X) is more than sum of size of running image (Y) and current free space (Z) i.e. --> X > (Y+Z). Prior to the fix, user was able to schedule the job and upgrade fails during the distribution. So as per the fix, verification will fail if X > Y + Z. Fix has been done for the scenario that prior/previous image upgrade was done via a bin distribution and user is trying to upgrade either:
(1) A bin image to tar image (Eventually a tar image is also extracted into a "bin image + other files" on the device's flash in a folder resembling the tar image name); or
(2) A bin image to bin image.
So SWIM is looking at tar filesize in case of (1) or (2). In this scenario, SWIM does not delete any file/directory other than the running bin image if space is less. "html" directory and/or other files is/are also not considered for deletion. So SWIM is not taking into calculation the space occupied by "html" directory or any other file/directory which is present on flash (apart from running bin image).
Here the size of tar image to be distributed (2924544) is greater than sum of free space (690176) and size of currently running bin image (1803944). Even if verification did not fail, the SWIM job would have eventually failed. So the only viable workaround is to download the image from Cisco.com into SWIM library and manually edit the minimum flash size requirements to less than 4MB.
