[JIRA] (OVIRT-1763) Increase entropy for hosts

[Evgheni Dereveanchin (oVirt JIRA)]

    [ https://ovirt-jira.atlassian.net/browse/OVIRT-1763?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=35344#comment-35344 ] 

Evgheni Dereveanchin commented on OVIRT-1763:
---------------------------------------------

And I think the difference in speed is caused by this part:

1) successful build 3834 taking 5 minutes to install packages - running in RAM:
02:49:59 [upgrade-from-release-suit] +++ df --output=avail /dev/shm
02:49:59 [upgrade-from-release-suit] +++ sed 1d
02:49:59 [upgrade-from-release-suit] ++ avail_shm=24589620
02:49:59 [upgrade-from-release-suit] ++ [[ 24589620 -ge 15000000 ]]
02:49:59 [upgrade-from-release-suit] ++ mkdir -p /dev/shm/ost
02:49:59 [upgrade-from-release-suit] ++ echo /dev/shm/ost/deployment-upgrade-from-release-suite-master
02:49:59 [upgrade-from-release-suit] + run_path=/dev/shm/ost/deployment-upgrade-from-release-suite-master

2) timed out build 3795 taking 15 minutes to install packages - running on disk:
15:29:24 [upgrade-from-release-suit] ++ local avail_shm
15:29:24 [upgrade-from-release-suit] +++ df --output=avail /dev/shm
15:29:24 [upgrade-from-release-suit] +++ sed 1d
15:29:24 [upgrade-from-release-suit] ++ avail_shm=14540900
15:29:24 [upgrade-from-release-suit] ++ [[ 14540900 -ge 15000000 ]]
15:29:24 [upgrade-from-release-suit] ++ echo /home/jenkins/workspace/ovirt-master_change-queue-tester/ovirt-system-tests/deployment-upgrade-from-release-suite-master
15:29:24 [upgrade-from-release-suit] + run_path=/home/jenkins/workspace/ovirt-master_change-queue-tester/ovirt-system-tests/deployment-upgrade-from-release-suite-master

Logging into the node where build 3795 was running I see 24GB free on the RAM drive when no jobs are running. Not really sure if anything should be on the RAM drive by the time that check is made, based on this we can take action and either clean it up, change the check or increase the timeout. [~bkorren at redhat.com], do you know any details about RAM drive specifics for OST?

> Increase entropy for hosts
> --------------------------
>
>                 Key: OVIRT-1763
>                 URL: https://ovirt-jira.atlassian.net/browse/OVIRT-1763
>             Project: oVirt - virtualization made easy
>          Issue Type: Bug
>            Reporter: Dafna Ron
>            Assignee: infra
>
> we had a failure in ost that was really hard to debug: http://jenkins.ovirt.org/job/ovirt-master_change-queue-tester/3795/
> There are no failures in the logs and the test itself was terminated by a timeout.
> It took the vms a long time to download packages and install and didi seems to think that this is due to limited entropy on the physical host. 
> we need to review this issue and increase the entropy on the hosts. 



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