I have some older units that are running only trusted VMs.

I'm looking to reduce as much as possible all speed impacting mitigations.

I found a stack exchange article with some info on setting kernel cmd line stuff, but I don't know what the correct way would be to apply it to XCP-ng 8.x systems.

https://unix.stackexchange.com/questions/554908/disable-spectre-and-meltdown-mitigations

What do I edit where? What commands to apply?

@olivierlambert

It's worth the attempt.

Maybe I can get it running standalone and work from there. I'm accessing everything remotely, no people there in the office.

@olivierlambert
The master is system xen2, the broken system is xen1

Can this be done without erasing the iscsi/drbd configs?

@olivierlambert

xe vm-list is-control-domain=true
uuid ( RO)           : 80506235-8ae0-4075-88d3-3c2f605d9b58
     name-label ( RW): Control domain on host: xen2
    power-state ( RO): running


uuid ( RO)           : c8e359da-2964-451d-af40-802cabbdf889
     name-label ( RW): Control domain on host: xen1
    power-state ( RO): halted


uuid ( RO)           : 059124f9-a845-498d-bbea-db8ac1b5ac70
     name-label ( RW): Control domain on host: xen3
    power-state ( RO): running

@olivierlambert

xe vm-list

uuid ( RO)           : c8e359da-2964-451d-af40-802cabbdf889
     name-label ( RW): Control domain on host: xen1
    power-state ( RO): halted

I have a botched update where we have a host that is getting the following error:

xapi: [debug||0 ||dbsync] dbsync caught an exception: INTERNAL_ERROR: [ Db_exn.Uniqueness_constraint_violation("VM", "uuid", "c8e359da-2964-451d-af40-802cabbdf889") ]

• yum update shows everything is up-to-date.
• There are no local SRs.
• Attempting to eject the host from the pool fails.
• The network interface configurations are whacked. Reset, and can't get bonds back up correctly either.

The host is configured to run DRBD for a Lizard-HA configured iSCSI SAN setup. (Which is not starting up).

Suggestions?

-Mike

Any updates in regards to getting nested Hyper-V working for WSL2?