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Subject [GitHub] [cloudstack] andrijapanicsb commented on issue #3720: VM stopped/crashing while Migration with Maintenance Mode (KVM)
Date Tue, 26 Nov 2019 23:24:13 GMT
andrijapanicsb commented on issue #3720: VM stopped/crashing while Migration with Maintenance
Mode (KVM)
URL: https://github.com/apache/cloudstack/issues/3720#issuecomment-558860214
 
 
   I believe the biggest problem I saw was VM crashing due to qemu bugs/issue (i.e. recently
saw this one “qemu-kvm general protection error in libtcmalloc.so.4.4.5”) – can’t
speak for other issues, since I don’t recall having them with ACS 4.5/4.8 with Ubuntu 14.04
(qemu 2.0 initially, later upgraded to 2.5)
   
   If not mistaken, there is indeed a behavior that if there is no enough capacities in the
cluster (test with a single KVM host in the cluster), the VMs will be stopped – and that
is a thing to change in my opinion. Maintenance should fail and host should be in ErrorInMaintenance
mode.
   If you want to do maintenance of that host, put the storage into the maintenance mode and
you are good to go. Even better, make an additional parameter like “forceMaintenance”
which will indeed stop VMs in order to reach Maintenance mode. Othewise will simply be in
ErrorInMaintenance.
   
   I really don’ recall having issues with 5 VMs/agent threads – and I’ve been doing
a lot of maintenance with couple of hunders of VMs 2-3 years ago (ACS 4.8). This one should
be reproduced first.
   
   Regards,
   Andrija Panic
   
   
   
   
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