VMware host disk latency reports on the average amount of time to process a read or write command issued by the guest operating system to the virtual machine.
Definition
High VMware host disk latency values indicate that storage for Oracle VMware and SQL Server VMware database applications may be overloaded or slow. Such high values justify further investigation to ensure proper system performance.
VMware host disk latency issues result from:
- Disk Write Latency = Kernel Write Latency + Device Write Latency
- Disk Read Latency = Kernel Read Latency + Device Read Latency
Expected disk latencies are dependent on the nature of the storage workload (e.g. read/write mix, randomness, and I/O size) and the storage subsystems' capabilities.
For more information pertaining to VMware host disk latency issues see:
Confio IgniteVM
Confio IgniteVM helps identify the impact of host disk latency 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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