The vSphere Client lists an alert stating, "Insufficient HA failover resources" or "Insufficient resources to satisfy vSphere HA failover level on cluster <Cluster_name> in <Datacenter_name>"
Article ID: 399680
Updated On:
Products
Issue/Introduction
When we put the host in Maintenance Mode DRS is not migrating any Vm's. Seeing Error "Insufficient resources to satisfy Vsphere HA Failover"
From log trace it's Evident that there are no sufficient resources to migrate VM's
From VPXD Logs
YYYY-MM-DD info vpxd[2237290] [Originator@6876 sub=drmLogger opID=agw-0490925-f0] MinPoweredOnCap UCRule, requiredCpu: 55674 requiredMem: 1640325
YYYY-MM-DD info vpxd[2237290] [Originator@6876 sub=drmLogger opID=agw-0490925-f0] MinPoweredOnCapacity check failed, requiredCpuCap : 55674,requiredMemCap : 1640325 neededCpuCap : -44818, neededMemCap : 154237\
** As soon as host is put in maintenance mode, DRS fails to migrate VMs
YYYY-MM-DD vpxd[2235782]: Event [204996694] [1-1] [vim.event.NoMaintenanceModeDrsRecommendationForVM] [info] [Unable to automatically migrate VM_Name]
YYYY-MM-DD vpxd[2235782]: Event [204996695] [1-1] [vim.event.NoMaintenanceModeDrsRecommendationForVM] [info] [Unable to automatically migrate VM_Name]
Environment
- vSphere 7.x
- vSphere 8.x
Cause
Since the Cluster available memory capacity (1486021) is less than the total required memory required (1640308) the Enter Maintenance Mode operation is failing for the cluster and hence we were unable to Migrate Vm's
Resolution
In order to avoid a scenario where a cluster has insufficient resources to satisfy vSphere HA, review Utilization and reserve memory if required.
Host NUM_VMS NUM_VCPUS MEM_MB CPU_ENT MEM_ENT CPU_MIN MEM_MIN CPU_MIN_CONFIG MEM_MIN_CONFIG MEM_DEMAND CPU_ACTIVE_40 CPU_Util Mem_Util CPU_CAPACITY MEM_CAPACITY(MB) AVAIL_MEM(MB) AVAIL_CPU(MHz)
=============================
host-X 19 68 364544 28770 347901 0 343121 0 342715 376230 28292 56.31% 50.64% 50246 743023 400180 50246
host-X 17 82 445440 19719 422479 20880 408037 20880 407654 449320 25777 51.30% 60.47% 50246 742998 335216 29366
host-X 16 73 470016 17996 385672 0 399897 0 399553 453000 25816 51.28% 60.94% 50346 743367 343686 50346
Total VMs memory reservation: 342715 + 407654 + 399553 = 1149922
Cluster available memory capacity: 743023 + 742998 = 1486021
Total required memory 1149922 + 490386 = 1640308
Cluster available memory capacity: 1486021
Additional Information
Some of the best practices are as follows to Optimize resources in the Cluster:
1. Reserve memory less than ~67% of total memory.
2. Reserve memory for critical workloads, for no critical workloads, better to reduce reservation or remove reservation.
3. If we cannot reduce the reservation, then increase the capacity by adding new hosts.
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