A user can experience an error in Strategy Web as shown below:

The Web Server encountered an unknown runtime error. Error in report results
CDSSServerMessage::SaveToFile: failed to write to file /Cache/Inbox/localhost/XXX.sql, exception caught: Failed to write 29604 bytes to file '29604'. (Server message 305419896) RCHashTable::backup, open file //Cache/Caches/Serverdef_ProjectGUID/CacheLKUP11.idx failed Failed to write 276 bytes to file '276'.[//Cache/Caches/Serverdef_ProjectGUID/CacheLKUP11.idx (Server message 305419896) No space left on device (Linux Standard C Library error 28)
The folder has reached its allocated limit of hard drive space.
Clear out some of the space in the folder or allocate more space.