Note: This bug is displayed in read-only format because
the product is no longer active in Red Hat Bugzilla.
RHEL Engineering is moving the tracking of its product development work on RHEL 6 through RHEL 9 to Red Hat Jira (issues.redhat.com). If you're a Red Hat customer, please continue to file support cases via the Red Hat customer portal. If you're not, please head to the "RHEL project" in Red Hat Jira and file new tickets here. Individual Bugzilla bugs in the statuses "NEW", "ASSIGNED", and "POST" are being migrated throughout September 2023. Bugs of Red Hat partners with an assigned Engineering Partner Manager (EPM) are migrated in late September as per pre-agreed dates. Bugs against components "kernel", "kernel-rt", and "kpatch" are only migrated if still in "NEW" or "ASSIGNED". If you cannot log in to RH Jira, please consult article #7032570. That failing, please send an e-mail to the RH Jira admins at rh-issues@redhat.com to troubleshoot your issue as a user management inquiry. The email creates a ServiceNow ticket with Red Hat. Individual Bugzilla bugs that are migrated will be moved to status "CLOSED", resolution "MIGRATED", and set with "MigratedToJIRA" in "Keywords". The link to the successor Jira issue will be found under "Links", have a little "two-footprint" icon next to it, and direct you to the "RHEL project" in Red Hat Jira (issue links are of type "https://issues.redhat.com/browse/RHEL-XXXX", where "X" is a digit). This same link will be available in a blue banner at the top of the page informing you that that bug has been migrated.
"iostat" now supports separate statistics for `r_await` and `w_await`
The "iostat" tool now supports separate statistics for `r_await` (average time for read requests issued to the device to be served) and `w_await` (average time for write requests issued to the device to be served) in the Device Utilization Report. Use the "-x" option to obtain a report which includes this information.
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
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