poor writing speed from vm machine

yp2004 · ‎02-24-2016

I ran ESXi 6.0 with two vms.

Config is:

rx300 s6, L5640x2 96GB memory, 12x 500GB RAID 10.

I tested disk performance in one of my vm, windows 2012, set 64GB, 16 cpu.

the test result is:

-----------------------------------------------------------------------

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* MB/s = 1,000,000 bytes/s [SATA/600 = 600,000,000 bytes/s]

* KB = 1000 bytes, KiB = 1024 bytes

Sequential Read (Q= 32,T= 1) : 402.394 MB/s

Sequential Write (Q= 32,T= 1) : 13.001 MB/s

Random Read 4KiB (Q= 32,T= 1) : 10.292 MB/s [ 2512.7 IOPS]

Random Write 4KiB (Q= 32,T= 1) : 1.487 MB/s [ 363.0 IOPS]

Sequential Read (T= 1) : 150.783 MB/s

Sequential Write (T= 1) : 22.230 MB/s

Random Read 4KiB (Q= 1,T= 1) : 0.737 MB/s [ 179.9 IOPS]

Random Write 4KiB (Q= 1,T= 1) : 0.332 MB/s [ 81.1 IOPS]

Test : 1024 MiB [C: 8.5% (84.9/999.7 GiB)] (x5) [Interval=5 sec]

Date : 2016/02/19 20:07:02

OS : Windows Server 2012 Datacenter (Full installation) [6.2 Build 9200] (x64)

The write speed is so poor, especially for the sequential write. It is my first VMware experience, any suggest is welcome. Thanks.

martinfnicman · ‎02-29-2016

Are the VMs on the same host?

What is the physical NIC on the host?

Are the NICs on the VMs using the VMXNET 3 adapter or E1000?

If you have 10Gb adapter you have to use VMXNET 3.

yp2004 · ‎02-29-2016

thank you for your reply. The test was only applied on one VM. I think NIC is not a problem here.

photofalk · ‎03-01-2016

Hi,

My first thought was to ask you about your Raid-Controller settings.

Have you turned on all Cache Features of your Raid-Controller?

Greetings

Falk