linux에 연결된 HDD의 IO 상태보기

/proc/diskstats 파일은 linux kernel 2.6 부터 지원하는 것으로
hdd의 파일 입출력 속도를 볼 수 있다.

음.. FC6에서는 해보니, 1초 간격으로 갱신되는것 같은데

$ cat /proc/diskstats    1    0 ram0 0 0 0 0 0 0 0 0 0 0 0    1    1 ram1 0 0 0 0 0 0 0 0 0 0 0    1    2 ram2 0 0 0 0 0 0 0 0 0 0 0    1    3 ram3 0 0 0 0 0 0 0 0 0 0 0    1    4 ram4 0 0 0 0 0 0 0 0 0 0 0    1    5 ram5 0 0 0 0 0 0 0 0 0 0 0    1    6 ram6 0 0 0 0 0 0 0 0 0 0 0    1    7 ram7 0 0 0 0 0 0 0 0 0 0 0    1    8 ram8 0 0 0 0 0 0 0 0 0 0 0    1    9 ram9 0 0 0 0 0 0 0 0 0 0 0    1   10 ram10 0 0 0 0 0 0 0 0 0 0 0    1   11 ram11 0 0 0 0 0 0 0 0 0 0 0    1   12 ram12 0 0 0 0 0 0 0 0 0 0 0    1   13 ram13 0 0 0 0 0 0 0 0 0 0 0    1   14 ram14 0 0 0 0 0 0 0 0 0 0 0    1   15 ram15 0 0 0 0 0 0 0 0 0 0 0    3    0 hda 108013 40509 5794964 3417656 108015 779595 7103102 61420792 0 2737052 64843120    3    1 hda1 1076 2158 19 38    3    2 hda2 147415 5792382 887883 7103064  253    0 dm-0 147169 0 5791122 5857704 887853 0 7102824 1796618756 0 2736044 1802476620  253    1 dm-1 70 0 560 1432 30 0 240 38624 0 6188 40056    2    0 fd0 0 0 0 0 0 0 0 0 0 0 0    9    0 md0 0 0 0 0 0 0 0 0 0 0 0

이런식으로 숫자만 잔뜩 나온다.

/proc/diskstats, giving some information (including device numbers) for each of the logical disk devices [링크 : http://en.wikipedia.org/wiki/Procfs]

sysstat 패키지의 iostat 유틸리티 [링크 : http://elenoa.tistory.com/52]

3.2 /proc/diskstat => disk utilization, throughput (only 2.6 kernels) [링크 : http://duo830210.tistory.com/45]

Field  1 -- # of reads completed     This is the total number of reads completed successfully. Field  2 -- # of reads merged, field 6 -- # of writes merged     Reads and writes which are adjacent to each other may be merged for     efficiency.  Thus two 4K reads may become one 8K read before it is     ultimately handed to the disk, and so it will be counted (and queued)     as only one I/O.  This field lets you know how often this was done. Field  3 -- # of sectors read     This is the total number of sectors read successfully. Field  4 -- # of milliseconds spent reading     This is the total number of milliseconds spent by all reads (as     measured from __make_request() to end_that_request_last()). Field  5 -- # of writes completed     This is the total number of writes completed successfully. Field  7 -- # of sectors written     This is the total number of sectors written successfully. Field  8 -- # of milliseconds spent writing     This is the total number of milliseconds spent by all writes (as     measured from __make_request() to end_that_request_last()). Field  9 -- # of I/Os currently in progress     The only field that should go to zero. Incremented as requests are     given to appropriate struct request_queue and decremented as they finish. Field 10 -- # of milliseconds spent doing I/Os     This field is increases so long as field 9 is nonzero. Field 11 -- weighted # of milliseconds spent doing I/Os     This field is incremented at each I/O start, I/O completion, I/O     merge, or read of these stats by the number of I/Os in progress     (field 9) times the number of milliseconds spent doing I/O since the     last update of this field.  This can provide an easy measure of both     I/O completion time and the backlog that may be accumulating. [링크 : http://www.mjmwired.net/kernel/Documentation/iostats.txt]