I am putting this message once again, since there is no reply... I am using debian 2.1 on Dell server equipped with 4 scsi hdd. Since the machine is running Oracle I try to distribuate load on all the drives. Under Sun the vmstat command shows some statistics about different drives activities, not only a total amount of reads - writes. Does anybody know about a tool that can help me monitor how my drives are working. thanx Jarek Lewinski