Red Hat Bugzilla – Bug 110092
iostat and /proc/stat stopped reporting disk io stats
Last modified: 2007-11-30 17:06:53 EST
From Bugzilla Helper: User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.4) Gecko/20030624 Netscape/7.1 (ax) Description of problem: HP/Compaq 5i Raid controller via cciss driver Under kernel e.25 iostat without any options and /proc/stat reports disk io activities. Kernel e.27 breaks this behavios, returning no disk devices via /proc/stat and forces you to use iostat -x <device name>. This breaks many reporting/monitoring tools. Version-Release number of selected component (if applicable): kernel e.27 smp/enterprise How reproducible: Always Steps to Reproduce: 1. cat /proc/stat | grep disk_io 2. iostat Actual Results: dbdw ulf /home/ulf > cat /proc/stat | grep disk_io disk_io: dbdw ulf /home/ulf > iostat Linux 2.4.9-e.27smp (dbdw.autc.com) 11/14/2003 avg-cpu: %user %nice %sys %idle 1.28 0.16 0.37 98.18 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn Expected Results: dbrac-01 ulf /home/ulf > cat /proc/stat | grep disk_io disk_io: (8,0):(8649272,4334321,109951450,4314951,25881846) (8,1):(149933448,89639727,1904556409,60293721,1421939631) (8,2):(16078475,9639371,234015576,6439104,58390020) (8,3):(115229339,63207878,1272929176,52021461,1264552234) (8,4):(12212193,3219863,192982128,8992330,744823446) (8,5):(8,8,16,0,0) (8,6):(35454538,17527387,365243778,17927151,365297260) dbrac-01 ulf /home/ulf > iostat Linux 2.4.9-e.25enterprise (dbrac-01) 11/14/2003 avg-cpu: %user %nice %sys %idle 8.43 0.62 2.72 88.23 Device: tps Blk_read/s Blk_wrtn/s Blk_read Blk_wrtn dev8-0 4.60 58.50 13.77 109951558 25881873 dev8-1 79.77 1013.32 756.55 1904556581 1421939688 dev8-2 8.55 124.51 31.07 234015748 58390057 dev8-3 61.31 677.27 672.81 1272929348 1264552271 dev8-4 6.50 102.68 396.29 192982128 744823542 dev8-5 0.00 0.00 0.00 16 0 dev8-6 18.86 194.33 194.36 365244046 365297388 Additional info: cciss driver is 2.4.45 in both kernels.
Talking to jp at Redhat, the above output of the e.25 kernel system is only showing the fibre channel attached storage, not the cciss device. /proc/stat is not showing anything as its define to stop at major number 99 and cciss uses higher major numbers, in this case 104.
I am having the same problem on a Compaq/HP DL 380 with cciss drivers on kernels e12, e16, e25 and e35. No data returned from iostat -d. An iostat -x will return other data that I am not needing. This appears on 7.3 as well. Versions of sysstat tested include 4.0.1, 4.0.3, 4.0.7 and 5.0.1. The disk_io: line in /proc/stat is blank if that makes any difference. Donnie Webb
This is a dup of bug 109799 *** This bug has been marked as a duplicate of 109799 ***
Changed to 'CLOSED' state since 'RESOLVED' has been deprecated.