Bug 1593912

Description of problem
======================

IOPS chart from At Glance section of Host Dashboard reports different values
compared to all other IOPS charts (it reports no data).

It's the only IOPS chart which separates write and read operations.

When the data are reported, read and write data seems to be swapped with each
other.

Version-Release number of selected component
============================================

tendrl-monitoring-integration-1.6.3-5.el7rhgs.noarch

[root@mbukatov-usm1-server ~]# rpm -qa | grep tendrl | sort
tendrl-ansible-1.6.3-5.el7rhgs.noarch
tendrl-api-1.6.3-3.el7rhgs.noarch
tendrl-api-httpd-1.6.3-3.el7rhgs.noarch
tendrl-commons-1.6.3-7.el7rhgs.noarch
tendrl-grafana-plugins-1.6.3-5.el7rhgs.noarch
tendrl-grafana-selinux-1.5.4-2.el7rhgs.noarch
tendrl-monitoring-integration-1.6.3-5.el7rhgs.noarch
tendrl-node-agent-1.6.3-7.el7rhgs.noarch
tendrl-notifier-1.6.3-4.el7rhgs.noarch
tendrl-selinux-1.5.4-2.el7rhgs.noarch
tendrl-ui-1.6.3-4.el7rhgs.noarch

[root@mbukatov-usm1-gl1 ~]#  rpm -qa | grep tendrl | sort
tendrl-collectd-selinux-1.5.4-2.el7rhgs.noarch
tendrl-commons-1.6.3-7.el7rhgs.noarch
tendrl-gluster-integration-1.6.3-5.el7rhgs.noarch
tendrl-node-agent-1.6.3-7.el7rhgs.noarch
tendrl-selinux-1.5.4-2.el7rhgs.noarch

How reproducible
================

100%

Steps to Reproduce
==================

1. prepare gluster trusted storage pool with at least one volume
2. install  WA using tendrl-ansible
3. mount the volume on dedicated client machine
4. on the client, copy large tarball in the volume while observing
   IOPS chart from At Glance section of Host Dashboard (on host
   with bricks hosting the file being copied into the volume)

note:

 * use a large file, which would use most of the brick space
 * this will generate write only IO (number of read operations should be
   much smaller compared to number of writes during copying like this)

Actual results
==============

In few 1st cases, this chart reports no data at all, while I can see IOPS
on other IOPS charts.

In some case, I see the data (not sure what make it appear compared to previous
tries, but the write IOs were reported as reads).

Expected results
================

IOPS are reported in a similar way to other IOPS charts, so that:

 * when I see IOPS in cluster level, affected host only IOPS should be visible
   in IOPS chart from At Glance section of Host Dashboard as well
 * write IO should be reported as write and not vice versa

Additional info
===============

I'm not sure why in this case, the read and writes are reported in 2 sepate
data lines while all the other IOPS chars reports total IOPS only.

See screenshot #1, where:

 * 1st copying of the file is visible in Brick Capacity utilization chart, but
   not in the IOPS chart
 * 2nd copying of the file is visible somehow, but reported as read IO (the
   green line)