[ovirt-users] Re: i/o wait and slow system

[info--- via Users]

Thank you.
ping -M do -s 8972 another-gluster-node is working.
The rest I'll check on the weekend.
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[ovirt-users] Re: i/o wait and slow system

[info--- via Users]

Thank you. They are all Thin. I have something to do at the weekend and change 
them to Preallocated. Looks like stopping the VM. Downloading and uploading the 
disk to change the format.
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[ovirt-users] HCI Cluster Configuration

[Clint Boggio]

Ovirt 4.3.9
HCI Gluster 3 Dell 730XD
Managed Engine

When I finished the "hosted engine deploy" I failed to add the gluster
storage according to the documentation and i'd like to get that back on
track.

1. I ticked the check box in the cluster configuration to "enable gluster
service", all of my current gluster storage domains went "red triangle" on
me and the hosts also went "red triangle" so I quickly changed it back and
all went back to normal.

Do I need to check that box to make the "Use Managed Gluster Volume" check
box and drop down menu show my HCI gluster volumes that exist on the three
nodes ?

Do I need to put the storage domain(s) in maintenance mode to change them
from unmanaged to managed ?

Will the system honor the VM(s) that live in my "engine" and "vmstore"
gluster volumes which are currently in use in the system if/when I change
them from unmanaged to managed,or will the system wipe them and hose my
managed engine and VMs ?


Thank you for your help !
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[ovirt-users] Re: ovirt-imageio : can't upload / download

[Michael Jones]

On 19/08/2020 14:48, Michael Jones wrote:
>
>
> On 19/08/2020 12:12, Michael Jones wrote:
>> On 19/08/2020 10:41, Nir Soffer wrote:
 There is no warning the method was deprecated and will be missing 
 functionality.

 The steps detailed on the alt install page are for the all-in-one running 
 engine-setup.

 It's also worth noting this works fine in;

 Version 4.3.1.1-1.el7

 but not in;

 Version 4.4.1.10-1.el8

 (el8 has the change in imageio daemons)

 The alternate install method is still useful to have, but i think a red 
 warning about all-in-one on el8 on that page would be good.

 Kind Regards,
 Michael Jones
>>> Micheal, can you file a bug for this?
>>>
>>> If you have a good use case for all-in-one deployment (not using
>>> hosted engine), please explain
>>> it in the bug.
>>>
>>> Personally I think simple all-in-one deployment without the complexity
>>> of hosted engine is better,
>>> and we should keep it, but for this we need to teach engine to handle
>>> the case when the proxy
>>> and the daemon are the same server.
>>>
>>> In this case engine will not try to setup a proxy ticket, and image
>>> transfer would work directly
>>> with the host daemon.
>>>
>>> I'm not very optimistic that we will support this again, since this
>>> feature is not needed for RHV
>>> customers, but for oVirt this makes sense.
>>>
>>> Nir
>>>
>> Yes, I can file a bug,
>>
>> The main usage / setup's I have are;
>>
>> on-prem installs:
>>
>> - hosted engine
>> - gluster
>> - high availiblity
>> - internal ip address
>> - easy great...
>>
>> dedicated host provider for example OVH single machine:
>>
>> - alternate install
>> - all-in-one
>>
>> The main reason for the separation is that using the cockpit install
>> / hosted engine install causes problems with ip allocations;
>>
>> cockpit method requires 1x ip for host, and 1x ip for engine vm, and
>> both ip must be in the same subnet...
>>
>> applying internal ip would cut off access, and to make it even
>> harder, getting public ip blocks didn't work as the box main ip
>> wouldn't be in the same subnet, adding nic alias ip doesn't work
>> either (fail on install due to failing to setup ovirtmgmt network).
>>
>> atm, i'll struggle with changing the machine's main ip to be one of
>> the same subnet with the engine one... (currently causes host to be
>> taken offline due to hosting provider, health checks)
>>
>> provided i can change the host primary ip to be one of the OVH
>> failover ip allocated in a block... i will be able to install using
>> the cockpit.
>>
>> and after the install i can setup internal ip with the network tag.
>>
>> Kind Regards,
>>
>> Mike
>>
> despite managing to get OVH to disable monitoring (ping to the main
> ip, and rebooting host) and getting the host in the same ip range as
> the engine vm...
>
> ie:
>
> host ip: 158.x.x.13/32 = not used anymore
>
> new subnet: 54.x.x.x/28
>
> and reserving;
> host = 54.x.x.16
> engine = 54.x.x.17
>
> [ ERROR ] The Engine VM (54.x.x.17/28) and the default gateway
> (158.x.x.254) will not be in the same IP subnet.
>
> the hosted engine installer crashes due to the gw being in a different
> subnet, so all three;
>
> - host
> - engine
> - gateway
>
> must be in the same subnet...
>
> this rules out an install on ovh dedicated server.
>
> unless... I can install the all-in-one again (this bit works), and
> then install the engine vm in an existing all-in-one setup...
>
> essentially the cockpit installation is not compatible with this infra
> setup.
>
After going through the documentation again, I understand the best way
to approach this would be to have a remote manager, ie;

self hosted engine (on-prem) > host/2nd DC/Cluster (remote/ovh)

standalone manager (on-prem) > host/2nd DC/Cluster (remote/ovh)

That way resolves the ip issues (only need host ip, just don't install
the manager on the remote server)

outstanding... i need to workout the security implications of this.

shame all-in-one is gone, but the above does work, and even means the
remote host can again use local storage.

I'll raise the bug report now i've finished testing, as I think stand
alone, all-in-one, dedicated hosts are affordable and open ovirt to a
wider user base (keeping hardware requirements minimal).

Thanks again,

Mike


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[ovirt-users] Re: Help remove snapshot

[Magnus Isaksson]

Thank you for all help, that did the trick.

Cheers
 Magnus

From: Eli Mesika 
Sent: 19 August 2020 19:37
To: Shani Leviim 
Cc: Magnus Isaksson ; users 
Subject: Re: [ovirt-users] Re: Help remove snapshot



On Mon, Aug 17, 2020 at 2:48 PM Shani Leviim 
mailto:slev...@redhat.com>> wrote:
Hi Magnus,
Sounds like you triggered this one 
https://bugzilla.redhat.com/show_bug.cgi?id=1555116.
The error message you've got was meant to avoid removing a snapshot from a 
broken chain.

On the Active VM snapshot -> Disks, is there any disk with Illegal status?

Deleting the whole snapshot can be done from the DB:
delete from snapshots where snapshot_id = '.';

please avoid deleting stuff from DB directly ,  you should use teh right SP for 
doing the job since in many time database consistency is handled by the SP code 
and doing it directly will leave inconsistent data which may cause problems

on this case you should use :

SELECT DeleteSnapshot(<'snapshot-id'>);


Although it's recommended to understand the root cause for that one.

Can you please share your engine.log?

Regards,
Shani Leviim


On Mon, Aug 17, 2020 at 1:37 PM Magnus Isaksson 
mailto:mag...@vmar.se>> wrote:
Hi!

I would need some help removing a snapshot that looks like this.
How do i remove it manually or fix snapshot definition?
-
Error while executing action:

TUN_SALDC01:

  *   The requested snapshot has an invalid parent, either fix the snapshot 
definition or remove it manually to complete the process.

-
And when i look at the disk on tha tnapshot it show as this:
[cid:173fc1ab77ba1f1f0b11]

And general info:
[cid:173fc1ab77ca20008322]
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[ovirt-users] Re: oVirt SHE smart-automated backup

[Strahil Nikolov via Users]

Actually,
you don't need  to find where the SHE is.
Once you setup the host in maintenance, all VMs including the SHE will be 
evacuated out of there.

Best Regards,
Strahil Nikolov

На 20 август 2020 г. 10:50:14 GMT+03:00, "Vrgotic, Marko" 
 написа:
>Dear oVirt,
>
>For a while now I have been running backup of oVirt engine via ansible.
>And that works just fine.
>However, its still recommended, in SHE HA environment, especially for
>Restore purpose to have one of HA nodes in Maintenance mode, clean from
>Virtual load.
>
>Has anyone so far been able to automate oVirt engine backup in
>following or similar way:
>
>  1.  Register on which HA node is SHE atm
>2.  Pick the other HA node to go into maintenance mode – in order to
>have one of HA nodes without virtual load
>  3.  Verify it’s in maintenance mode
>  4.  Execute engine-backup
>  5.  Remove the maintenance mode of the node from step 2
>
>Even if you are half way through, I would be happy to get involved and
>contribute.
>
>Kindly awaiting your reply.
>
>
>-
>kind regards/met vriendelijke groeten
>
>Marko Vrgotic
>Sr. System Engineer @ System Administration
>
>ActiveVideo
>e: m.vrgo...@activevideo.com
>w: www.activevideo.com
>
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[ovirt-users] Re: i/o wait and slow system

[Strahil Nikolov via Users]

Are you using fully allocated VM disks ?

На 20 август 2020 г. 0:53:40 GMT+03:00, info--- via Users  
написа:
>Additional Info: I've running Nextcloud on a VM.
>- to sync (download) 1 file to the client with 300 MB is fast
>- to sync (download) 300 files to the client with in total 1 MB is very
>slow
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[ovirt-users] Re: i/o wait and slow system

[Strahil Nikolov via Users]

На 19 август 2020 г. 22:39:22 GMT+03:00, info--- via Users  
написа:
>Thank you for the quick reply.
>
>- I/O scheduler hosts -> changed
>echo noop > /sys/block/sdb/queue/scheduler
>echo noop > /sys/block/sdc/queue/scheduler

On reboot it will be reverted. Test this way and if you notice improvement use 
udev rules.  Keep  in mind that multipath devices also have a scheduler.


>- CPU states -> can you explain this a bit more?

On Intel CPUs you can use these kernel parameters (check them online as I type 
them by memory) 
processor.max_cstate=1 intel_idle.max_cstate=0 

>cat /dev/cpu_dma_latency
>F
>hexdump -C /dev/cpu_dma_latency
>  46 00 00 00   |F...|
>0004
>
>- Tuned  profile -> can you explain this a bit more?

Download  
ftp://ftp.redhat.com/redhat/linux/enterprise/7Server/en/RHS/SRPMS/redhat-storage-server-3.5.0.0-6.el7rhgs.src.rpm
  and extract the srpm.
Inside  it you will find 2 dirs: 'rhgs-random-io' &'rhgs-sequential-io'.
Open the tuned.conf files inside them and check the 'dirty' sysctl tunings. One 
 is for random I/O (usually the Vm workload is random I/O)  and another  for 
sequential.
You can set the 'dirty' settings in your sysctl.conf or your custom tuned 
profile.

>- MTU was already set to 9000 -> can you explain a bit more

Have  you tested  via :
ping -M do -s 8972 another-gluster-node

>tcp-offloading and how I change the settings?

You can google  it. Usually ethtool is your best friend.

>ethtool -k enp1s0f0 | grep offload
>tcp-segmentation-offload: on
>udp-fragmentation-offload: off [fixed]
>generic-segmentation-offload: on
>generic-receive-offload: on
>large-receive-offload: off [fixed]
>rx-vlan-offload: on
>tx-vlan-offload: on
>l2-fwd-offload: off [fixed]
>hw-tc-offload: off
>rx-udp_tunnel-port-offload: on
>
>- I/O scheduler VM had already none
>cat /sys/block/vda/queue/scheduler
>none

Consider using udev here too.

>- oVirt 4.4 -> thanks. Was not aware that the new version is final. I
>will check and upgrade.

Upgrades are not so easy as you need to:
A) Upgrade OS to EL8
B) Upgrade ovirt

Test in advance before proceeding on prod !

>- Use High Performance VMs -> I got following message -> So I need to
>do changes also on the VM?
>The following recommended settings for running the High Performance
>type with the optimal configuration were not detected. Please consider
>manually changing of the following before applying:
>CPU PINNING: 
>VIRTUAL NUMA AND NUMA PINNING: 
>HUGE PAGES: 
>KERNEL SAME PAGE MERGING (KSM): 
>
>- libgfapi -> I will execute on the engine following command and then
>it will change all VMs after reboot?
>engine-config -s LibgfApiSupported=true --cver4.2

VM reboot won't reread the VM config. You will need an 'off' and 'on' action 
for each VM. I'm not sure about the command. I haven't used  libgfapi for eons.


>- changed values (from your other threat):
>gluster volume set vmstore performance.read-ahead on
>gluster volume set vmstore performance.stat-prefetch on
>gluster volume set vmstore performance.write-behind-window-size 64MB
>gluster volume set vmstore performance.flush-behind on
>
>- already configured:
>performance.client-io-threads: on

It's easier to use:
gluster volume set VOLUME  group virt

WARNING: This will enable sharding and SHARDING cannot be disabled in an easy 
way. NEVER EVER DISABLE SHARDING.

You can check the 'virt' group of settings on your gluster nodes in 
/var/lib/glusterd/group.



>Best Regards
>Dirk
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[ovirt-users] [ANN] oVirt 4.4.2 Fourth Release Candidate is now available for testing

[Lev Veyde]

oVirt 4.4.2 Fourth Release Candidate is now available for testing

The oVirt Project is pleased to announce the availability of oVirt 4.4.2
Fourth Release Candidate for testing, as of August 20th, 2020.

This update is the second in a series of stabilization updates to the 4.4
series.
Important notes before you try it

Please note this is a pre-release build.

The oVirt Project makes no guarantees as to its suitability or usefulness.

This pre-release must not be used in production.
Installation instructions

For installation instructions and additional information please refer to:

https://ovirt.org/documentation/

This release is available now on x86_64 architecture for:

* Red Hat Enterprise Linux 8.2 or newer

* CentOS Linux (or similar) 8.2 or newer

This release supports Hypervisor Hosts on x86_64 and ppc64le architectures
for:

* Red Hat Enterprise Linux 8.2 or newer

* CentOS Linux (or similar) 8.2 or newer

* oVirt Node 4.4 based on CentOS Linux 8.2 (available for x86_64 only)

See the release notes [1] for installation instructions and a list of new
features and bugs fixed.

Notes:

- oVirt Appliance is already available for CentOS Linux 8

- oVirt Node NG is already available for CentOS Linux 8

Additional Resources:

* Read more about the oVirt 4.4.2 release highlights:
http://www.ovirt.org/release/4.4.2/

* Get more oVirt project updates on Twitter: https://twitter.com/ovirt

* Check out the latest project news on the oVirt blog:
http://www.ovirt.org/blog/


[1] http://www.ovirt.org/release/4.4.2/

[2] http://resources.ovirt.org/pub/ovirt-4.4-pre/iso/

-- 

Lev Veyde

Senior Software Engineer, RHCE | RHCVA | MCITP

Red Hat Israel



l...@redhat.com | lve...@redhat.com

TRIED. TESTED. TRUSTED. 
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[ovirt-users] Re: Max running ansible-playbook

[Arik Hadas]

On Tue, Aug 18, 2020 at 10:49 AM Tommaso - Shellrent via Users <
users@ovirt.org> wrote:

> No one have this kind of problem?
>
> We use OVA export to make some backup, but the whole task takes a lot of
> time because only one ansible-playbook
> "/usr/share/ovirt-engine/playbooks/ovirt-ova-export.yml" run at the same
> time.
>

How do you trigger the export operations?
Do you select multiple VMs/templates in the webadmin and call export to OVA?


> Il 13/08/2020 10:14, Tommaso - Shellrent via Users ha scritto:
>
> Hi to all.
>
> on our angine we always see max 1 ansible-playbook running on the same
> time.
>
> How can we ingrease this value?
>
>
> Regards.
> --
> --
> [image: Shellrent - Il primo hosting italiano Security First]
> *Tommaso De Marchi*
> *COO - Chief Operating Officer*
> Shellrent Srl
> Via dell'Edilizia, 19 - 36100 Vicenza
> Tel. 0444321155 <+390444321155> | Fax 04441492177
>
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[ovirt-users] Re: Is oVirt suited for supporting long-lived VMs than OpenStack?

[Gianluca Cecchi]

Il Gio 20 Ago 2020, 10:08 Luca 'remix_tj' Lorenzetto <
lorenzetto.l...@gmail.com> ha scritto:

> On Thu, Aug 20, 2020 at 10:02 AM yam yam  wrote:
> >
> > thanks, Luca
> >
> > As you said, I thought they have different use cases like pets vs cattle.
> > but as OpenStack supports many features(like live migration, snapshot,
> vm HA, ...), it "I guess" seems to encompass what oVirt can do.
> >
> > so is there any specific use case oVirt only covers??
>
> Hello,
>
> i know no one. But oVirt il 10x easier to manage because has a simpler
> setup (fewer components).
>
> Luca
>
> --
>

In general, but also as you are comparing oVirt and OpenStack, that are the
upstream projects for two Red Hat products, this link can help to begin to
dig into traditional virtualization vs cloud computing:

https://www.redhat.com/en/topics/cloud-computing/cloud-vs-virtualization

Hih,
Gianluca
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[ovirt-users] Re: Is oVirt suited for supporting long-lived VMs than OpenStack?

[Luca 'remix_tj' Lorenzetto]

On Thu, Aug 20, 2020 at 10:02 AM yam yam  wrote:
>
> thanks, Luca
>
> As you said, I thought they have different use cases like pets vs cattle.
> but as OpenStack supports many features(like live migration, snapshot, vm HA, 
> ...), it "I guess" seems to encompass what oVirt can do.
>
> so is there any specific use case oVirt only covers??

Hello,

i know no one. But oVirt il 10x easier to manage because has a simpler
setup (fewer components).

Luca

-- 
"E' assurdo impiegare gli uomini di intelligenza eccellente per fare
calcoli che potrebbero essere affidati a chiunque se si usassero delle
macchine"
Gottfried Wilhelm von Leibnitz, Filosofo e Matematico (1646-1716)

"Internet è la più grande biblioteca del mondo.
Ma il problema è che i libri sono tutti sparsi sul pavimento"
John Allen Paulos, Matematico (1945-vivente)

Luca 'remix_tj' Lorenzetto, http://www.remixtj.net , 
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[ovirt-users] Re: Is oVirt suited for supporting long-lived VMs than OpenStack?

[yam yam]

thanks, Luca

As you said, I thought they have different use cases like pets vs cattle.
but as OpenStack supports many features(like live migration, snapshot, vm HA, 
...), it "I guess" seems to encompass what oVirt can do.

so is there any specific use case oVirt only covers??
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[ovirt-users] oVirt SHE smart-automated backup

[Vrgotic, Marko]

Dear oVirt,

For a while now I have been running backup of oVirt engine via ansible. And 
that works just fine.
However, its still recommended, in SHE HA environment, especially for Restore 
purpose to have one of HA nodes in Maintenance mode, clean from Virtual load.

Has anyone so far been able to automate oVirt engine backup in following or 
similar way:

  1.  Register on which HA node is SHE atm
  2.  Pick the other HA node to go into maintenance mode – in order to have one 
of HA nodes without virtual load
  3.  Verify it’s in maintenance mode
  4.  Execute engine-backup
  5.  Remove the maintenance mode of the node from step 2

Even if you are half way through, I would be happy to get involved and 
contribute.

Kindly awaiting your reply.


-
kind regards/met vriendelijke groeten

Marko Vrgotic
Sr. System Engineer @ System Administration

ActiveVideo
e: m.vrgo...@activevideo.com
w: www.activevideo.com

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[ovirt-users] Re: Is oVirt suited for supporting long-lived VMs than OpenStack?

[Luca 'remix_tj' Lorenzetto]

Hello

On Thu, Aug 20, 2020 at 6:41 AM yam yam  wrote:
>
> Hi guys,
>
> I'm wondering why people say oVirt is better suited for traditional workloads 
> like long-lived VMs than OpenStack.
> does oVirt have some additional features for it?

oVirt is a traditional hypervisor, for "traditional" workloads (pets,
not cattle). So it is suitable for vm deployed and running for months
to years. Support snapshots, vm live migration from host to host etc
etc.

In several cases people looking at an alternative hypervisor for
vmware lands on Openstack because it is a bigger project. After some
testing they find out is not suitable for their use case. Instead
oVirt is the right tool you're looking for if you want to have the
same kind of workload you'll run on vmware.

Luca



-- 
"E' assurdo impiegare gli uomini di intelligenza eccellente per fare
calcoli che potrebbero essere affidati a chiunque se si usassero delle
macchine"
Gottfried Wilhelm von Leibnitz, Filosofo e Matematico (1646-1716)

"Internet è la più grande biblioteca del mondo.
Ma il problema è che i libri sono tutti sparsi sul pavimento"
John Allen Paulos, Matematico (1945-vivente)

Luca 'remix_tj' Lorenzetto, http://www.remixtj.net , 
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