Description of problem: iostat always reports 100% disk util Version-Release number of selected component (if applicable): 5.0.5-9.fc How reproducible: always Steps to Reproduce: 1. run iostat 2. 3. Actual results: all disks show 100% disk utilization Expected results: disks show actual utilization Additional info: This problem started with the 2.6.16-x series of kernels. I did not have this problem with previous FC4 kernels, so maybe it gets reassigned to kernel managers.
I try to reproduce your problem with kernel 2.6.16-1.2096_FC5smp but I was unsuccesfull. Please could you reproduce this problem with the latest version of sysstat (sysstat-6.0.2-1.i386.rpm)? Which version of kernel do you use?
The kernel I'm using is the latest version for FC4, 2.6.16-1.2096_FC4. The sysstat I'm using is the latest version of sysstat available for FC4. Arch is x86_64. I can't install the FC5 package on FC4 because of library dependencies. Is there an updated version for FC4 somewhere?
Could you please try to reproduce your problem with the test version of sysstat which is on http://people.redhat.com/varekova/sysstat-5.0.5-10.fc.test.x86_64.rpm and attached its output here.
Created attachment 129053 [details] Output from 5.0.5-10.fc.test Requested output.
This seems to be kernel problem - sysstat count the right values from input data produced by kernel (/proc/diskstats).
I've seen RHEL3 bug reports about the same, however that's a 2.4 kernel. Look at this: sda and sdb show bogus avqqu-sz (361909.31). They're SATA, but hdd is OK (IDE DVD-writer) [rolf@home01 ~]$ iostat -x 1 Linux 2.6.16-1.2115_FC4 (home01.home.vertis.nl) 06/24/2006 avg-cpu: %user %nice %sys %iowait %idle 3.15 0.03 0.85 0.76 95.22 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util hdd 2.15 0.00 0.06 0.00 8.81 0.00 4.40 0.00 158.42 0.00 29.58 21.89 0.12 sda 0.15 8.11 1.10 2.50 44.68 84.96 22.34 42.48 36.00 3.42 25.03 277.68 99.99 sdb 0.15 8.11 1.11 2.50 45.98 84.96 22.99 42.48 36.24 3.41 24.36 276.74 99.99 md0 0.00 0.00 2.07 8.11 69.46 64.87 34.73 32.44 13.20 0.00 0.00 0.00 0.00 md1 0.00 0.00 0.44 1.68 21.20 13.45 10.60 6.73 16.30 0.00 0.00 0.00 0.00 dm-0 0.00 0.00 2.51 9.73 90.62 77.81 45.31 38.90 13.77 3.90 318.45 0.91 1.12 dm-1 0.00 0.00 0.00 0.06 0.03 0.51 0.02 0.26 8.00 0.02 260.50 0.28 0.00 avg-cpu: %user %nice %sys %iowait %idle 1.00 0.00 1.00 98.00 0.00 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s rkB/s wkB/s avgrq-sz avgqu-sz await svctm %util hdd 142.00 0.00 48.00 0.00 760.00 0.00 380.00 0.00 15.83 0.84 16.92 17.50 84.00 sda 2.00 0.00 17.00 4.00 440.00 32.00 220.00 16.00 22.48 361909.31 22.67 47.81 100.40 sdb 2.00 0.00 36.00 4.00 512.00 32.00 256.00 16.00 13.60 361909.32 12.00 25.10 100.40 md0 0.00 0.00 56.00 0.00 944.00 0.00 472.00 0.00 16.86 0.00 0.00 0.00 0.00 md1 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 dm-0 0.00 0.00 56.00 0.00 944.00 0.00 472.00 0.00 16.86 0.39 7.00 3.71 20.80 dm-1 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 [rolf@home01 ~]$
I withdraw the last comment: kernel-2.6.17-1.2139_FC4 solves the matter.