VMware 4817V62 Administration Guide - Page 334

vSphere Basic System Administration Table C-3. Disk Data Counters (Continued) Counter Label Description Entity VHR C queueReadLatency Queue Read Latency queueWriteLatency Queue Write Latency read Disk Read Rate Average amount of time taken during the collection interval per SCSI read command in the VMKernel queue. n Stats Type: absolute n Unit: millisecond n Rollup Type: average n Collection Level: 2 n VC/ESX: Yes/Yes ο•ο ο Average amount time taken during the collection interval per SCSI write command in the VMKernel queue. n Stats Type: absolute n Unit: millisecond n Rollup Type: average n Collection Level: 2 n VC/ESX: Yes/Yes ο•ο ο VM Rate at which data is read from each ••ο ο virtual disk on the virtual machine. Host Rate at which data is read from each LUN on the host. read rate = # blocksRead per second × blockSize totalLatency totalReadLatency Disk Command Latency Disk Read Latency n Stats Type: rate n Unit: kiloBytesPerSecond n Rollup Type: average n Collection Level: 2 n VC/ESX: Yes/Yes Average amount of time taken during the collection interval to process a SCSI command issued by the Guest OS to the virtual machine. The sum of kernelLatency and deviceLatency. n Stats Type: absolute n Unit: millisecond n Collection Level: 2 n Rollup Type: average n VC/ESX: Yes/Yes ••ο ο Average amount of time taken during the collection interval to process a SCSI read command issued from the Guest OS to the virtual machine. The sum of kernelReadLatency and deviceReadLatency. n Stats Type: absolute n Unit: millisecond n Collection Level: 2 n Rollup Type: average n VC/ESX: Yes/Yes ο•ο ο 334 VMware, Inc.