Hi, there, I use the vmstat command and got the following information: linux:/proc # vmstat procs -----------memory---------- ---swap-- -----io---- --system-- ----cpu---- r b swpd free buff cache si so bi bo in cs us sy id wa 4 0 0 6496 53620 319828 0 0 373 96 1124 1677 17 4 70 9 I am not very clear about the "IO" section. What does bi and bo mean? Could someone explain it for me? Or where can I find the explaination of thoes things? Thanks Raymond _________________________________________________________________ Powerful Parental Controls Let your child discover the best the Internet has to offer. http://join.msn.com/?pgmarket=en-ca&page=byoa/prem&xAPID=1994&DI=1034&SU=http://hotmail.com/enca&HL=Market_MSNIS_Taglines Start enjoying all the benefits of MSN® Premium right now and get the first two months FREE*.