This report shows the number of VM disk bus reset commands issued. This typically occurs when storage demand is excessively high, or when storage is not properly configured to handle the I/O load. Disk bus resets are a primary cause of VMware performance issues. Storage devices should be configured properly to avoid significant performance issues.
Definition
When VM disk bus resets are in effect, the disk subsystem times out and commands are aborted and retried. This happens when the HBA device is overloaded, or its queue depth is exhausted.
Monitoring wait times across both physical and virtual environments is the best way to determine where VMware performance issues are creating bottlenecks.
Note: This metric is not available if the virtual machine is using an NFS (network file system) datastore.
Confio IgniteVM
Confio IgniteVM helps identify the impact of VM disk bus resets for sites running Oracle on VMware, SQL Server on VMware, and other virtual databases. IgniteVM helps DBAs maintain performance and availability on virtual servers. IgniteVM is the only virtualization-aware database monitoring solution.
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