Re: Problems configuring iscsi domain on ovirt 4.4.4.7-1.el8 / centos 8
by David Johnson
Ok. The nfs share with the vdsm group is working. But the intent is to
switch to iSCSI. The little bit of documentation about iSCSI mentions
nothing about vdsm or group 36. That gives me something to work with at
least.
Any ideas about how to clean up the mess left by the first attempt? I'm not
finding the records for botched domain creation in the engine database, but
the GUI shows them and complains that the iSCSI device is registered twice.
On Wed, Feb 16, 2022, 2:06 AM Strahil Nikolov <hunter86_bg(a)yahoo.com> wrote:
> To be honest, I just asked from curiosity.
> In NFS it's mandatory to use group 36, but this is the linux group.
>
> I guess in TrueNAS it's something else, as I never configured group in
> targetcli.
>
> The flow is usually:
> - Target server listens on multiple IPs
> - Client makes discovery on a single ip
> - client logs in (lsscsi is the simplest approach to verify it)
> - Client discovers and logs on other IPs that the target server uses
> - Multipath aggregates the links
>
> As Multipath has a timeout of 20s while iscsi client uses 120s by default,
> I usually change the client to use 15s timeout.
>
> When a path (for eample 1 switch is dead) is down, multipath will try
> another link to reach the target server.
>
> It's nice there is a vdsm tool to configure those .
>
> WARNING: Never set clients with the same IQN (defined in a file in
> /etc/iscsi...somethig -> see with rpm -ql iscsi-utils)
>
> Best Regards,
> Strahil Nikolov
>
> On Wed, Feb 16, 2022 at 9:18, David Johnson
> <djohnson(a)maxistechnology.com> wrote:
> I used group 1 because nothing said what group to use, and googling "ovirt
> iSCSI setup" returned nothing useful so I picked a number. If there is
> someplace that actually gives detailed instructions I'm going to bookmark
> it when I get the link.
>
> Yes, there is a storage network. There was a miscommunication and the
> person attempting to create the connection didn't read instructions, so
> they keyed in the main network ip, leaving a small mess for me to clean up.
> The old truenas with nfs share is on the storage network and functioning
> cleanly, and ovirt is able to see the iSCSI share on the storage network ip
> address.
>
> Thank you.
>
> On Tue, Feb 15, 2022, 11:45 PM Strahil Nikolov <hunter86_bg(a)yahoo.com>
> wrote:
>
> Did you configure a storage network on oVirt ?
>
> About the size, why you use group '1' and not group '36' ?
>
> Best Regards,
> Strahil Nikolov
>
> On Tue, Feb 15, 2022 at 20:47, David Johnson
> <djohnson(a)maxistechnology.com> wrote:
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2 years, 2 months
Problems configuring iscsi domain on ovirt 4.4.4.7-1.el8 / centos 8
by David Johnson
Since the general recommendation seems to be to use iSCSI over NFS wth
ovirt, I expect that I am missing something very obvious.
Question: How do I complete the iSCSI storage domain configuration?
Hardware configuration:
- cluster controller - physical system
- compute nodes - 2
- Current file store: NFS on TrueNAS
- To-be file store: iSCSI on TrueNAS
Problem reproduction:
1. We decided that the problems with NFS (regularly blocking and causing
VM's to go into paused instead of IOWait mode) outweighed the benefit of
ease of management, so we are preparing to move to iSCSI back end on
TrueNAS.
2. We created an iSCSI share on the to-be TrueNAS system and granted
access to a "ovirtuser" and group "1", with 30+ TB available storage.
3. We started to add the iscsi share to the ovirt data center using the
GUI, under "Storage > Storage Domains" click the "New Domain" button.
*Problem 1: *Ovirt immediately found the iSCSI share (yay), but says it has
0 GB and will not allow us to add it to the data center, or edit or remove
it, so it is in a limbo state.
*Problem 2: *Ovirt shows it on the wrong network (miscommunication). It is
finding it on the general network instead of the isolated data network. The
TrueNAS will be removed from the general network as soon as
configuration is complete.
Thank you
*David Johnson*
2 years, 2 months
Cluster and datacenter compatibility levels
by Colin Coe
Hi all
I'm looking for a definitive answer on what each compatibility level means.
Specifically, I'm looking for:
- new features
- deprecated features
- removed features
We're on 4.3 so I'm looking for the info above on 4.4, 4.5 and 4.6
My main motivation is to ensure we don't lose SPICE support.
We actually use RHV and I logged a case with Red Hat GSS but couldn't get
the info I was after.
Thanks
2 years, 2 months
vm seal
by Nathanaël Blanchet
Hello,
I noticed that a vm created from a "sealed" template is initially mount
on one host with libguestfs, with a virt-sysprep process, before getting
ready to be used.
This should be unuseful given that the template is already sealed. Is
there a reason to that?
--
Nathanaël Blanchet
Supervision réseau
SIRE
227 avenue Professeur-Jean-Louis-Viala
34193 MONTPELLIER CEDEX 5
Tél. 33 (0)4 67 54 84 55
Fax 33 (0)4 67 54 84 14
blanchet(a)abes.fr
2 years, 2 months
Re: Backup prozess
by marcel d'heureuse
Sure:
https://github.com/vacosta94/VirtBKP
Br
Marcel
Am 14. Februar 2022 20:29:47 MEZ schrieb Jonas Liechti <jonas(a)rabe.ch>:
>Would you mind sharing a link to this script? I would be interested in how it works.Am 14.02.2022 19:45 schrieb marcel d'heureuse <marcel(a)deheureu.se>:
>>
>> Moin,
>>
>> We have in our Environment 12 servers managed by one self hosted engine. It is ovirt 4.3.9. We are Freizeit on that Version.
>>
>> How did you make Backups? We use a github Script which generate via api a snapshot and Mount this disk into the vm where the backup Script is running. The backup Script Export this additional Hard disk to a storage and disconnect the disk and remove the snapshot.
>>
>> This works on Linux vm fine if they have Medium load. If we try this with a Windows 10 vm or Windows Server vm or a Linux vm with high load or with a very big Hard drive this will not work. Disk can't Export and snapshot will not delete.
>>
>> I have found winchin and bareos but I have not start to check this first I want to have some more possible options.
>>
>> Thanks
>>
>> Marcel
2 years, 2 months
Re: Backup prozess
by Jonas Liechti
Would you mind sharing a link to this script? I would be interested in how it works.Am 14.02.2022 19:45 schrieb marcel d'heureuse <marcel(a)deheureu.se>:
>
> Moin,
>
> We have in our Environment 12 servers managed by one self hosted engine. It is ovirt 4.3.9. We are Freizeit on that Version.
>
> How did you make Backups? We use a github Script which generate via api a snapshot and Mount this disk into the vm where the backup Script is running. The backup Script Export this additional Hard disk to a storage and disconnect the disk and remove the snapshot.
>
> This works on Linux vm fine if they have Medium load. If we try this with a Windows 10 vm or Windows Server vm or a Linux vm with high load or with a very big Hard drive this will not work. Disk can't Export and snapshot will not delete.
>
> I have found winchin and bareos but I have not start to check this first I want to have some more possible options.
>
> Thanks
>
> Marcel
2 years, 2 months
Backup prozess
by marcel d'heureuse
Moin,
We have in our Environment 12 servers managed by one self hosted engine. It is ovirt 4.3.9. We are Freizeit on that Version.
How did you make Backups? We use a github Script which generate via api a snapshot and Mount this disk into the vm where the backup Script is running. The backup Script Export this additional Hard disk to a storage and disconnect the disk and remove the snapshot.
This works on Linux vm fine if they have Medium load. If we try this with a Windows 10 vm or Windows Server vm or a Linux vm with high load or with a very big Hard drive this will not work. Disk can't Export and snapshot will not delete.
I have found winchin and bareos but I have not start to check this first I want to have some more possible options.
Thanks
Marcel
2 years, 2 months
