In IBM Connections there are 4 predefined policies regarding the size limits for personal files, Communities, …

You simply can get those values entering the following commands in wsadmin:

wsadmin>execfile(“filesAdmin.py”)
Files Administration initialized.

wsadmin>FilesPolicyService.browse(sortOption=”maximumSize”, sortAscending=”false”, pageNumber=1, itemsPerPage=50)

Here´s the result:

{maximumSize=524288000, title=!Default for Personal Files, id=00000000-0000-0000-0000-000000000000},
{maximumSize=524288000, title=!Default for Community Wikis, id=00000000-0000-0000-0000-000000000003},
{maximumSize=524288000, title=!Default for Non-Community Wikis, id=00000000-0000-0000-0000-000000000002},
{maximumSize=524288000, title=!Default for Community Files, id=00000000-0000-0000-0000-000000000001},
{maximumSize=20971520, title=!Default for Guest Users, id=00000000-0000-0000-0000-000000000004}]

If you want to change the default size for the personal files for all users you simply can adjust the setting in the “Default for Personal Files” by entering the following command:

FilesPolicyService.editPersonalDefault(21474836480L)
 >> This would extend the limit from 500MB to 20GB
 >> If you set the value above 2GB, you have to append “L” to the new size limit

Some examples and the documentation can be found here:
http://www-01.ibm.com/support/knowledgecenter/SSYGQH_5.0.0/admin/admin/t_admin_files_policies.dita?lang=de