Red Hat Bugzilla – Bug 1185057
[RFE] update/backport the w_await and r_await statistics in iostat (added in sysstat 9.1.2)
Last modified: 2016-05-10 16:31:26 EDT
Description of problem: Later versions of iostat have two additional columns which will give you the ‘await’ time for read and write separately, splitting them out, r_await and w_await. Version-Release number of selected component (if applicable): sysstat-9.0.4-27.el6.x86_64 How reproducible: 100% Steps to Reproduce: 1. iostat -x Actual results: [root@rhel6 ~]# iostat -x Linux 2.6.32-431.29.2.el6.x86_64 (rhel6.example.com) 01/22/2015 _x86_64_ (1 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 0.16 0.00 0.08 0.09 0.00 99.68 Device: rrqm/s wrqm/s r/s w/s rsec/s wsec/s avgrq-sz avgqu-sz await svctm %util vda 0.59 7.22 1.11 0.33 93.18 59.90 105.67 0.01 6.98 0.70 0.10 dm-0 0.00 0.00 1.55 7.49 92.07 59.88 16.80 0.85 94.47 0.11 0.10 dm-1 0.00 0.00 0.04 0.00 0.31 0.02 8.00 0.00 0.46 0.22 0.00 Expected results: [root@rhel7 cron.d]# iostat -x Linux 3.10.0-123.13.2.el7.x86_64 (rhel7.example.com) 01/22/2015 _x86_64_ (1 CPU) avg-cpu: %user %nice %system %iowait %steal %idle 7.45 0.00 0.72 0.14 0.00 91.69 Device: rrqm/s wrqm/s r/s w/s rkB/s wkB/s avgrq-sz avgqu-sz await r_await w_await svctm %util vda 0.08 0.21 6.67 11.58 297.77 525.00 90.20 0.02 1.17 0.65 1.47 0.62 1.13 dm-0 0.00 0.00 6.72 11.79 297.30 524.82 88.86 0.03 1.36 0.77 1.69 0.64 1.18 dm-1 0.00 0.00 0.49 1.11 11.84 11.49 29.24 0.01 3.31 1.53 4.09 1.05 0.17 Additional info: r_await and w_await were introduced in the 9.1.2 development branch. In order to get that we'd need to either cherry pick the commit or upgrade to at least a 10.0.X branch Then again RHEL7 is shipping a development branch, so maybe we can ship 9.1.2+ for rhel6
Created attachment 989751 [details] sysstat-9.0.4-rw-await.patch
Hello, I've attached patch which backports this feature to the RHEL-6, and I've proposed this bug for RHEL-6.8 as sysstat is not updated in 6.7. Unfortunately, this late in the cycle, I can't make any promises that sysstat will be updated in RHEL-6. If this feature is important for you, please talk to the PM. Thanks, peter
Since the problem described in this bug report should be resolved in a recent advisory, it has been closed with a resolution of ERRATA. For information on the advisory, and where to find the updated files, follow the link below. If the solution does not work for you, open a new bug report. https://rhn.redhat.com/errata/RHBA-2016-0790.html