Ok –

These are the symlinks in place:

1. /var/run/vdsm/storage/<hosted_storage_id>/<path_to_conf_image>
2. /var/run/vdsm/storage/<hosted_storage_id>/<path_to_metadata_image>
3. /var/run/vdsm/storage/<hosted_storage_id>/<path_to_lockspace_image>
4. /var/run/vdsm/storage/<hosted_storage_id>/<path_to_vmdisk_id_image>  -  this one exist only on the current Host
5. /var/run/vdsm/storage/<hosted_storage_id>/<one more_link_I_have_no_clue what_it_is_for>

Migration issue – seem to be solved at part 3:

Part1:

• Try to migrate HE from Host1 to Host3 – migration fails
• Analysis showed that Host3 was missing the symlink num4 – which should be created during migration
• I created symlink num4 and that migration works but HE on donor host has status “down_unexpected” instead of “down”

Part2:

• Next thing I noticed was that symlink num1 was missing on both Hosts
• Added symlink num1 to both Hosts and reran the migration
• Migration done successfully from Host1 to Host3 and HE on donor host had status “down”

Part3:

• Migrating back from Host3 to Host1
• Noticed that at beginning of migration the symlink num4 gets created on destination Host (Host1 in this case)
• This time the symlink num4 on destination was not deleted and migration went through

Part4:

• Repeated migration from Host1 to Host3
• All went as expected.

New HE Host deploy issue:

• Current conclusion is that the new HE Host deploy was failing as the symlink num1 was not existing on running Hosts ( 1 and 3) so it was reported as missing/non-existent
• Since the link is now added and it persists – I will try to deploy new HA Host

I will keep you posted.

-----

kind regards/met vriendelijke groeten

Marko Vrgotic
Sr. System Engineer @ System Administration

ActiveVideo

o: +31 (35) 6774131

m: +31 (65) 5734174

e: m.vrgotic@activevideo.com
w: www.activevideo.com

ActiveVideo Networks BV. Mediacentrum 3745 Joop van den Endeplein 1.1217 WJ Hilversum, The Netherlands. The information contained in this message may be legally privileged and confidential. It is intended to be read only by the individual or entity to whom it is addressed or by their designee. If the reader of this message is not the intended recipient, you are on notice that any distribution of this message, in any form, is strictly prohibited.  If you have received this message in error, please immediately notify the sender and/or ActiveVideo Networks, LLC by telephone at +1 408.931.9200 and delete or destroy any copy of this message.

From: Marko Vrgotic <M.Vrgotic@activevideo.com>
Date: Tuesday, 4 May 2021 at 13:47
To: Strahil Nikolov <hunter86_bg@yahoo.com>, Yedidyah Bar David <didi@redhat.com>
Cc: users@ovirt.org <users@ovirt.org>
Subject: Re: [ovirt-users] Re: Unable to migrate Engine to another HE Host

Hi Strahil,

Creating link towards conf_image on shared storage, did help in regards to HE migrating with donor not ending up with down_expected but simply down.

Regarding “Can you paste the contents of the ha daemons' config where the shared storage should be defined?”, are you referring to /etc/ovirt-hosted-engine-ha/agent.conf, var/lib/ovirt-hosted-engine-ha/broker.conf and ha.conf ?

If not, please give me specific files, so I can provide configs.

-----

kind regards/met vriendelijke groeten

Marko Vrgotic
Sr. System Engineer @ System Administration

ActiveVideo

o: +31 (35) 6774131

m: +31 (65) 5734174

e: m.vrgotic@activevideo.com
w: www.activevideo.com

ActiveVideo Networks BV. Mediacentrum 3745 Joop van den Endeplein 1.1217 WJ Hilversum, The Netherlands. The information contained in this message may be legally privileged and confidential. It is intended to be read only by the individual or entity to whom it is addressed or by their designee. If the reader of this message is not the intended recipient, you are on notice that any distribution of this message, in any form, is strictly prohibited.  If you have received this message in error, please immediately notify the sender and/or ActiveVideo Networks, LLC by telephone at +1 408.931.9200 and delete or destroy any copy of this message.

From: Strahil Nikolov <hunter86_bg@yahoo.com>
Date: Tuesday, 4 May 2021 at 09:21
To: Marko Vrgotic <M.Vrgotic@activevideo.com>, Yedidyah Bar David <didi@redhat.com>
Cc: users@ovirt.org <users@ovirt.org>
Subject: Re: [ovirt-users] Re: Unable to migrate Engine to another HE Host

***CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you recognize the sender!!!***

It's quite interesting why the link is not created when it should ...

Can you paste the contents of the ha daemons' config where the shared storage should be defined?

You can create the link if needed, but it won't solve the problem.

Best Regards,

Strahil Nikolov