Hi Yaniv,

thank you for your answer! I haven't known, that there is already such a monitoring tool on ovirt.

We will sure give it a try, but we have already in our environment a monitoring tool, that's why I wanted to add those values, too.

How does collectd get this data from libvirt, when the corresponding cgroup values are empty?

BR Florian

---

Von: "Yaniv Kaul" <ykaul@redhat.com>
An: "Florian Schmid" <fschmid@ubimet.com>
CC: "users" <users@ovirt.org>
Gesendet: Dienstag, 27. Juni 2017 09:08:51
Betreff: Re: [ovirt-users] Empty cgroup files on centos 7.3 host

On Mon, Jun 26, 2017 at 11:03 PM, Florian Schmid <fschmid@ubimet.com> wrote:

Hi,

I wanted to monitor disk IO and R/W on all of our oVirt centos 7.3 hypervisor hosts, but it looks like that all those files are empty.

We have a very nice integration with Elastic based monitoring and logging - why not use it.

On the host, we use collectd for monitoring.

See http://www.ovirt.org/develop/release-management/features/engine/metrics-store/

Y.

 

For example:
ls -al /sys/fs/cgroup/blkio/machine.slice/machine-qemu\\x2d14\\x2dHostedEngine.scope/
insgesamt 0
drwxr-xr-x.  2 root root 0 30. Mai 10:09 .
drwxr-xr-x. 16 root root 0 26. Jun 09:25 ..
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_merged
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_merged_recursive
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_queued
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_queued_recursive
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_service_bytes
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_service_bytes_recursive
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_serviced
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_serviced_recursive
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_service_time
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_service_time_recursive
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_wait_time
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.io_wait_time_recursive
-rw-r--r--.  1 root root 0 30. Mai 10:09 blkio.leaf_weight
-rw-r--r--.  1 root root 0 30. Mai 10:09 blkio.leaf_weight_device
--w-------.  1 root root 0 30. Mai 10:09 blkio.reset_stats
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.sectors
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.sectors_recursive
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.throttle.io_service_bytes
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.throttle.io_serviced
-rw-r--r--.  1 root root 0 30. Mai 10:09 blkio.throttle.read_bps_device
-rw-r--r--.  1 root root 0 30. Mai 10:09 blkio.throttle.read_iops_device
-rw-r--r--.  1 root root 0 30. Mai 10:09 blkio.throttle.write_bps_device
-rw-r--r--.  1 root root 0 30. Mai 10:09 blkio.throttle.write_iops_device
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.time
-r--r--r--.  1 root root 0 30. Mai 10:09 blkio.time_recursive
-rw-r--r--.  1 root root 0 30. Mai 10:09 blkio.weight
-rw-r--r--.  1 root root 0 30. Mai 10:09 blkio.weight_device
-rw-r--r--.  1 root root 0 30. Mai 10:09 cgroup.clone_children
--w--w--w-.  1 root root 0 30. Mai 10:09 cgroup.event_control
-rw-r--r--.  1 root root 0 30. Mai 10:09 cgroup.procs
-rw-r--r--.  1 root root 0 30. Mai 10:09 notify_on_release
-rw-r--r--.  1 root root 0 30. Mai 10:09 tasks


I thought, I can get my needed values from there, but all files are empty.

Looking at this post: http://lists.ovirt.org/pipermail/users/2017-January/079011.html
this should work.

Is this normal on centos 7.3 with oVirt installed? How can I get those values, without monitoring all VMs directly?

oVirt Version we use:
4.1.1.8-1.el7.centos

BR Florian
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