High virtual disks latency and low virtual disk performance when all virtual machines reside on the same NFS datastore

Products

• VMware vSphere ESXi

Issue/Introduction

Symptoms:

• When virtual machines run on the same host and use the same NFS datastore and the IOPS limit is set on at least one virtual machine, you experience high virtual disks latency and low virtual disk performance.
• Even when a different IOPS limit is specified for different virtual machines, IOPS limit on all virtual machines is set to the lowest value assigned to a virtual machine in the NFS datastore.
• You do not experience the virtual disks latency and low virtual disk performance issues when virtual machines:
  • Reside on the VMFS datastore
  • Run on the same ESXi host, but are placed on the NFS datastore in which none of the virtual machines have an IOPS limit set
  • Run on the same ESXi host, but are placed on different NFS datastores that do not share the client connection
  • Run on different ESXi hosts, but are placed on the same NFS datastore

Environment

VMware vSphere ESXi 5.1
VMware vSphere ESXi 5.5
VMware vSphere ESXi 5.0

Resolution

This issue is resolved in:

• ESXi 5. Patch 8. Fore more information, see VMware ESXi 5.0, Patch Release ESXi500-201405001 (2075521). To download the patch, see Download Patches.
• ESXi 5.1 Patch 4. For more information, see VMware ESXi 5.1, Patch ESXi510-201404401-BG: Updates esx-base (2070667). To download the patch, see Download Patches.
• ESXi 5.5 Update 2. For more information see vSphere ESXi 5.5 Update 2 Release Notes. To download the patch, see Download Patches.

Additional Information

すべての仮想マシンが同一のNFS データストア上にある場合、仮想ディスクの待ち時間が増加しパフォーマンスが低下する
VMware ESXi 5.1, Patch ESXi510-201404401-BG: Updates esx-base