Maynor, There is a document from VMware called "vSphere Command-Line Interfrace Installation and Refernce Guide" from vmware.com. This is a remote CLI package you can use to manage and monitor your ESX hosts. One of the commands is called resxtop and is used for performance monitoring of the host. Using resxtop you can specifically montior the storage devices attached to the host and see if there are any issues with LUN access.  The guide has instructions on how to setup the remote CLI.
in a production VM LINUX host we are having an xtrange delay accessingin a meta LUN provisioned from a CX4, what could be the reason of thisif the box seems to be ok. what step do i need to follow to identify the root causes in the datastore 1. check cables2. check gbics3. ckeck hba4. check storage cache is there any cli command to check response time of this specif LUN or METALUN. or from the esx host via cli is there any way to check datastore consistency and performancethanks mc
CX4 - vmware esx, how identify why a VM production host, has error in an 
provisioned meta LUN