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VMware 5.0 Disk I/O performance – Thick Provision Lazy Zeroed vs Thick Provision Eager Zeroed vs Thin Provision

August 25, 2011 8 comments

Hello dear reader,

As you know VMware has announced some time ago the vsphere 5  and finally it can be downloaded by anyone 🙂

Based on this i decided to test the performance of the 3 types of disks supported by VMware :

Basically the VM had 2 virtual disks assigned for the benchmark :

  • Thick Provision Lazy Zeroed
  • Thick Provision Eager Zeroed
  • Thin Provision

Test setup :

One VM has been configured with 2 vcpu’s, 2 GB ram and 4 disks, all using the LSI SAS SCSI Controller :

  • Disk 01 is the Windows “disk”  (c:\ drive)
  • Disk 02 it’s a Thick Provision Lazy Zeroed disk
  • Disk 03 it’s a Thick Provision Eager Zeroed disk
  • Disk 04 it’s a Thin Provision disk

The VM had 1 Gigabit link without any sort of redundancy, link aggregation, no MPIO , no jumbo frames to an ISCSI storage. The purpose of this exercise is to see the performance differences between the 3 types of disks and not to see the performance of the ISCSI storage .

Anyway….let’s go for the results

Results : ( results parsed at http://vmktree.org/iometer/ )

  •     I/O of a Thick Provision Lazy Zeroed disk
Test name Latency Avg iops Avg MBps cpu load
Max Throughput-100%Read 0.00 3491 109 3%
RealLife-60%Rand-65%Read 12.87 4490 25 11%
Max Throughput-50%Read 101.44 6190 193 15%
Random-8k-70%Read 13.96 5681 44 17%
  • I/O of a Thick Provision Eager Zeroed disk
Test name Latency Avg iops Avg MBps cpu load
Max Throughput-100%Read 0.00 3511 109 1%
RealLife-60%Rand-65%Read 12.78 4460 34 30%
Max Throughput-50%Read 102.88 6261 195 2%
Random-8k-70%Read 14.19 5770 45 34%
  • I/O of a Thin Provision disk
Test name Latency Avg iops Avg MBps cpu load
Max Throughput-100%Read 0.00 3530 110 0%
RealLife-60%Rand-65%Read 13.06 4566 35 30%
Max Throughput-50%Read 102.36 6243 195 2%
Random-8k-70%Read 14.17 5767 45 36%

Conclusion :

It seems like VMware has quite similar performance across different types of disks (at least with the used benchmark profile for this test) and for me the Thin Provision disk would probably be the chosen one due to the fact of being…Thin .

During the next days/weeks i will try to get some more tests, against different storage devices and using ISCSI and NFS .

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vSphere 5.0 Download available

August 25, 2011 Leave a comment

Well well well…it looks like vSphere 5.0 is , finally, available for download.

Check it out at www.vmware.com and have fun !