IOSTAT(8) BSD System Manager's Manual IOSTAT(8) NNAAMMEE iioossttaatt - report I/O statistics SSYYNNOOPPSSIISS iioossttaatt [--cc _c_o_u_n_t] [--MM _c_o_r_e] [--NN _s_y_s_t_e_m] [--ww _w_a_i_t] [_d_r_i_v_e_s] DDEESSCCRRIIPPTTIIOONN IIoossttaatt displays kernel I/O statistics on terminal, disk and cpu opera- tions. The options are as follows: --cc Repeat the display _c_o_u_n_t times. The first display is for the time since a reboot and each subsequent report is for the time period since the last display. If no _w_a_i_t interval is specified, the de- fault is 1 second. --MM Extract values associated with the name list from the specified core instead of the default ``_/_d_e_v_/_k_m_e_m''. --NN Extract the name list from the specified system instead of the de- fault ``_/_v_m_u_n_i_x''. --ww Pause _w_a_i_t seconds between each display. If no repeat _c_o_u_n_t is specified, the default is infinity. IIoossttaatt displays its information in the following format: tty tin characters read from terminals tout characters written to terminals disks Disk operations (this field is system dependent). The header of the field is the disk name and unit number. If more than four disk drives are configured in the system, iioossttaatt displays only the first four drives. To force iioossttaatt to display specific drives, their names may be supplied on the command line. sps sectors transferred per second tps transfers per second msps milliseconds per average seek (including implied seeks and rotational latency) cpu us % of cpu time in user mode ni % of cpu time in user mode running niced processes sy % of cpu time in system mode id % of cpu time in idle mode FFIILLEESS /vmunix Default kernel namelist. /dev/kmem Default memory file. SSEEEE AALLSSOO fstat(1), netstat(1), nfsstat(1), ps(1), systat(1), vmstat(1), pstat(8) The sections starting with ``Interpreting system activity'' in _I_n_s_t_a_l_l_i_n_g _a_n_d _O_p_e_r_a_t_i_n_g _4_._3_B_S_D. 4th Berkeley Distribution June 6, 1993 1