Analyza vykonu Storage za pomoci VMware utilitky vscsiStats

esxtop is a great tool for performance analysis of all types. However, with only latency and throughput statistics, esxtop will not provide the full picture of the storage profile. Furthermore, esxtop only provides latency numbers for Fibre Channel and iSCSI storage. Latency analysis of NFS traffic is not possible with esxtop.

Since ESX 3.5, VMware has provided a tool specifically for profiling storage: vscsiStats. vscsiStats collects and reports counters on storage activity. Its data is collected at the virtual SCSI device level in the kernel. This means that results are reported per VMDK (or RDM) irrespective of the underlying storage protocol. The following data are reported in histogram form:

* IO size
* Seek distance
* Outstanding IOs
* Latency (in microseconds)
* More!



Zdroj:
Using vscsiStats for Storage Performance Analysis http://communities.vmware.com/docs/DOC-10095