declare @t table(serv varchar(500), hdd varchar(20), mem int, rem_mem int)
insert @t
  select 'server 1', 'Disk 1', 2000, 500 union all select 'server 1', 'Disk 2', 4000, 100 union all select 'server 2', 'Disk 1', 1000, 900
select *, --rem_mem*100/mem,
case 
  when rem_mem*100/mem < 11 then '0-10'
  when rem_mem*100/mem between 11 and 30 then '11-30'
  else '31-100'
end [Фильтр в MS Reporting]
from @t