i'am having IBM server with Redhat 5 ElsmP connected to the IBM Storage over iSCSI (in sdb ) can someone explain this output from iostat command avg-cpu: %user %nice %system %iowait %steal %idle 12.79 0.01 4.53 72.22 0.00 10.45 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn sda 95.63 48.88 240.95 485589164 2393706728 sdb 29.20 350.49 402.08 3481983365 3994494696 move large file to sdb very slowly,it seem normaly?