1030 - Got error 28 from storage engine

select cd.categories_description, c.categories_id, cd.categories_name, cd.categories_heading_title, c.categories_image, c.parent_id from categories c, categories_description cd where c.categories_status = '1' and c.parent_id = '310004' and c.categories_id = cd.categories_id and c.group_permission_1=1 and cd.language_id = '1' order by sort_order, cd.categories_name

[XT SQL Error]

Warning: Unknown: write failed: No space left on device (28) in Unknown on line 0 Warning: Unknown: Failed to write session data (files). Please verify that the current setting of session.save_path is correct (/var/www/clients/client1/web1/tmp) in Unknown on line 0