RHEV VM disk export and backup with best performance without east-west traffic

As per RedHat it is safest backup method for VM image  to reuse it elsewhere:
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Choose one RHEV host with minimum VMs on it and place your VM with exports (NFS) data store on it. Also, make this host an SPM host and now run below steps:
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1) Select a VM (Offline) and click on export

2) Check  Collapse snapshots to have only one VM disk. Wait to see confirmation dialogue!

3) exported VM can be accessed at NFS share as real disk image in images folder :)

All the best!

Virsh read commands to manage RHEV H - credentials

[root@dedroclp01 ~]# cat /etc/pki/vdsm/keys/libvirt_password
shibboleth

[root@dedroclp01 ~]# virsh list --all
Please enter your authentication name: vdsm@rhevh
Please enter your password:
 Id    Name                           State

rhevm network persistence issue

Today I observed a strange issue due to host non operational

>Tried service vdsmd restart but there was another issue with rhevm network which went down and was not coming up:

I had to recreate /etc/sysconfig/network-scripts/ifcfg-rhevm (it was trying dhcp for ip addressing) from another host.

Also I had to re create  bond0 at /var/lib/vdsm/persistence/netconf/bond and rhevm at /var/lib/vdsm/persistence/netconf/nets

--=====

[root@dedrhosp4 bin]# cd /var/lib/vdsm/persistence/netconf
[root@dedrhosp4 netconf]# pwd
/var/lib/vdsm/persistence/netconf
[root@dedrhosp4 netconf]# ll
total 8
drwxr-xr-x. 2 root root 4096 Jul 30 22:07 bonds
drwxr-xr-x. 2 root root 4096 Jul 30 22:07 nets
[root@dedrhosp4 netconf]# ll -R
.:
total 8
drwxr-xr-x. 2 root root 4096 Jul 30 22:07 bonds
drwxr-xr-x. 2 root root 4096 Jul 30 22:07 nets

./bonds:
total 24
-rw-r--r--. 1 root root 58 Jul 30 22:07 bond0
-rw-r--r--. 1 root root 58 Jun 10 15:17 bond1
-rw-r--r--. 1 root root 58 Jun 10 15:17 bond2
-rw-r--r--. 1 root root 58 Jun 10 15:17 bond3
-rw-r--r--. 1 root root 58 Jun 10 15:17 bond4
-rw-r--r--. 1 root root 60 Jun 10 15:17 bond5

./nets:
total 68
-rw-r--r--. 1 root root 121 Jun 10 15:17 intnet_655
-rw-r--r--. 1 root root 106 Jun 10 15:17 neutron
-rw-r--r--. 1 root root 224 Jul 30 22:07 rhevm
-rw-r--r--. 1 root root 120 Jun 10 15:17 vlan_25
-rw-r--r--. 1 root root 203 Jun 10 15:17 vlan_651
-rw-r--r--. 1 root root 121 Jun 10 15:17 vlan_656
-rw-r--r--. 1 root root 121 Jun 10 15:17 vlan_657
-rw-r--r--. 1 root root 121 Jun 10 15:17 vlan_700
-rw-r--r--. 1 root root 121 Jun 10 15:17 vlan_701
-rw-r--r--. 1 root root 121 Jun 10 15:17 vlan_712
-rw-r--r--. 1 root root 121 Jun 10 15:17 vlan_714
-rw-r--r--. 1 root root 121 Jun 10 15:17 vlan_715
-rw-r--r--. 1 root root 121 Jun 10 15:17 vlan_800
-rw-r--r--. 1 root root 121 Jun 10 15:17 vlan_801
-rw-r--r--. 1 root root 121 Jun 10 15:17 vlan_802
-rw-r--r--. 1 root root 121 Jun 10 15:17 vlan_803
-rw-r--r--. 1 root root 121 Jun 10 15:17 vlan_804

Host Non-operational issue - Storage domain monitoring thread slows down

Implemented following change to resolve/avoid this issue:

1)      Check the current configuration on RHEV Manager using after switching to root:

engine-config -g MaxStorageVdsTimeoutCheckSec

2)      Change the current configuration (change value to 75):

rhevm-config -s MaxStorageVdsTimeoutCheckSec=75

Now 2^nd parameter  “vdsHeartbeatInSeconds”

3)      Check the current configuration:

engine-config -g vdsHeartbeatInSeconds

4)      Change the current configuration (change value to 20) if it’s not set to 20 already:

rhevm-config -s vdsHeartbeatInSeconds=20

5)      Restart the ovirt-engine service after this.

               /etc/init.d/ovirt-engine restart

Check the changed configurations:

engine-config -g MaxStorageVdsTimeoutCheckSec

engine-config -g vdsHeartbeatInSeconds

Data storage domain (FC storage) has some issue. it is getting unavailable to different RHEV hosts randomly.

We can fix this issue by setting following steps on RHEV manager:
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#grep vdsHeartbeatInSeconds.type /etc/ovirt-engine/engine-config/engine-config.properties

#cp /etc/ovirt-engine/engine-config/engine-config.properties /etc/ovirt-engine/engine-config/engine-config.properties.backup

#echo vdsHeartbeatInSeconds.type=Integer >> /etc/ovirt-engine/engine-config/engine-config.properties

#engine-config -s vdsHeartbeatInSeconds=20

#service ovirt-engine restart

#service jbossas restart

#engine-config  -l vdsHeartbeatInSeconds

#engine-config  --help

#engine-config -g vdsHeartbeatInSeconds

IPA user unable to login - rare issue

/tmp permission could be an issue, check and change!

error deadlock detected in postgresql - RHEVM down

/tmp permissions can result in "error deadlock detected in postgresql"

make sure that /tmp has appropriate permissions.

Update RHEVM!