Hello,
Thank you for reply.
I confirmed the performance chart at the host where the VM(work_GJL) is residing on.There are stats available.
I did some test,the issue has occured when the VM is on a NFS.If I migrate the VM to the local disk of the ESXi host then the [Disk Read and Write] is available.
My ESXi version is 5.1.0 Build 838463,vCenter Server version is 5.1.0 Build 880146.
Thanks.