off topic: iostat -x in linux

oracledbaŁ¬

        dba friends, do you know how to measure the io capacity usage(%busy) in linux server, like solaris:

                               extended device statistics
device    r/s  w/s   kr/s   kw/s wait actv  svc_t  %w  %b 
sd6       0.0  0.0    0.0    0.0  0.0  0.0    0.0   0   0 
sd9       0.0  0.0    0.0    0.0  0.0  0.0    0.0   0   0 
sd10      0.0  0.0    0.0    0.0  0.0  0.0    0.0   0   0 
ssd2      0.0 10.0    0.0   22.0  0.0  0.0    1.8   0   2 
ssd3      0.0  0.0    0.0    0.0  0.0  0.0    0.0   0   0 
ssd4     51.0  0.0  408.0    0.0  0.0  0.5   10.1   0  41 
ssd5      0.0  0.0    0.0    0.0  0.0  0.0    0.0   0   0 
nfs1      0.0  0.0    0.0    0.0  0.0  0.0    0.0   0   0 

         In linux, it seems difficult, I have tried linux iostat and sysstat-iostat, non of them seems to work properly with util column in iostat report. Though no activity on the server at all, iostat always report utilization of the partitions 100% Why?     I also searched google and found the same question asked by others, but nobody replied.

        Anyone have the same experience? How did you measure the load on the io subsystem in your linux server then? IO wait is still 0%, but io capacity usage is 100%. Confusing...

avg-cpu: %user %nice %sys %iowait %idle 3.00 0.00 0.00 0.00 97.00

Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
/dev/sda 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 42941682.96 0.00 0.00 100.00
/dev/sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 42949662.96 0.00 0.00 100.00
/dev/sda2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 10.00 0.00 0.00 100.00
/dev/sda3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 42949652.96 0.00 0.00 100.00
/dev/sda5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
/dev/sda6 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
/dev/sda7 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 42948232.96 0.00 0.00 100.00

avg-cpu: %user %nice %sys %iowait %idle 2.00 0.00 0.50 0.00 97.50

Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util
/dev/sda 0.00 2.00 1.00 4.00 8.00 48.00 4.00 24.00 11.20 42941683.06 2.00 200.00 100.00
/dev/sda1 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 42949662.96 0.00 0.00 100.00
/dev/sda2 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 10.00 0.00 0.00 100.00
/dev/sda3 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 42949652.96 0.00 0.00 100.00
/dev/sda5 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
/dev/sda6 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00 0.00
/dev/sda7 0.00 2.00 1.00 4.00 8.00 48.00 4.00 24.00 11.20 42948233.06 2.00 200.00 100.00
        

Regards
zhu chao
msn:chao_ping_at_163.com
www.happyit.net
www.cnoug.org(China Oracle User Group)

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