Memory Admission Control Issue for Storage IO Control

Products

• VMware vSphere ESXi

Issue/Introduction

Symptoms:

• vSphere 6.7 and Above, ESXi hosts might experience a Memory Admission Control issue for Storage IO Control.
• This condition leads to the following log spew in the /var/log/vmkernel.log file

MemSchedAdmit: 470: Admission failure in path: sioc/storageRM.13011002/uw.13011002
MemSchedAdmit: 477: uw.13011002 (68246725) extraMin/extraFromParent: 256/256, sioc (840) childEmin/eMinLimit: 14059/14080

and can cause ESXi Host unresponsiveness 


 

Environment

VMware vSphere ESXi 6.7

Resolution

This is fixed in ESXi 6.7 update 3.

Workaround:

Users can workaround the issue by restarting the SIOC service using the following commands on the affected ESXi Hosts:
 

1. Check the status of storageRM and sdrsInjector

/etc/init.d/storageRM status
/etc/init.d/sdrsInjector status

2. Stop the service

/etc/init.d/storageRM stop
/etc/init.d/sdrsInjector stop

3. Start the service

/etc/init.d/storageRM start
/etc/init.d/sdrsInjector start

 

If the issue persists even after the SIOC service is restarted, users can temporarily disable SIOC by turning off the feature from VMware Virtual Center