Can you please share the ESX and SDK version which are you using to retrieve the metrics?
I am able to retrieve the disk metric, totalLatency, on a ESX 4.0. Below are the disk metrics which are retrieved when we invoke queryPerf on HostSystem object:
1 - disk.usage.none Aggregate storage performance statistics. For hosts, this can be represented on a per virtual machine basis as a stacked graph.
2 - disk.usage.average Aggregate storage performance statistics. For hosts, this can be represented on a per virtual machine basis as a stacked graph.
3 - disk.usage.minimum Aggregate storage performance statistics. For hosts, this can be represented on a per virtual machine basis as a stacked graph.
4 - disk.usage.maximum Aggregate storage performance statistics. For hosts, this can be represented on a per virtual machine basis as a stacked graph.
5 - disk.numberRead.summation Number of disk reads in the period
6 - disk.numberWrite.summation Number of disk writes in the period
7 - disk.read.average Rate of reading data from the disk
8 - disk.write.average Rate of writing data to the disk
9 - disk.totalLatency.average The average amount of time a command takes from the perspective of a guest operating system. This average is the sum of the kernel command latency and the physical device command latency.
10 - disk.maxTotalLatency.latest The highest total latency value of all disks on the host.
11 - disk.commandsAborted.summation Number of disk commands stopped in the period
12 - disk.busResets.summation Number of bus resets in the period
13 - disk.used.latest Storage space actually used by a virtual machine or a datastore
14 - disk.provisioned.latest Storage size up to which a virtual machine or files on a datastore can grow
15 - disk.capacity.latest Datastore storage capacity
16 - disk.unshared.latest Storage space not shared by a virtual machine with others
17 - disk.deltaused.latest Storage overhead of a virtual machine or a datastore due to delta disk backings
18 - disk.commands.summation Number of disk commands issued in the period
19 - disk.deviceReadLatency.average The average time a read from the physical device takes.
20 - disk.kernelReadLatency.average The average time spent in VMkernel per read
21 - disk.totalReadLatency.average The average amount of time a read takes from the perspective of a guest operating system. This average is the sum of kernel read latency and physical device read latency.
22 - disk.queueReadLatency.average The average time spent in the VMkernel queue per read.
23 - disk.deviceWriteLatency.average The average time a write from the physical device takes.
24 - disk.kernelWriteLatency.average The average time spent in VMkernel per write.
25 - disk.totalWriteLatency.average The average amount of time a write takes from the perspective of a guest operating system. This average is the sum of the kernel write latency and the physical device write latency.
26 - disk.queueWriteLatency.average The average time spent in the VMkernel queue per write.
27 - disk.deviceLatency.average The average time a command from the physical device takes.
28 - disk.kernelLatency.average The average time spent in VMkernel per command.
29 - disk.queueLatency.average The average time spent in the VMkernel queue per command.
