DELL PowerStore 1000T and S4112 – Jumbo Frames (MTU) performance impact with VMware vSphere 7

DELL PowerStore 1000T and S4112 – Jumbo Frames (MTU) performance impact with VMware vSphere 7

its few days that i have some new stuff in our lab so i decided to perform some performance impact of Jumbo Frames on the SAN 10 GbE network. For the test i used the ATTO Disk BenchMark 4.01.0f1

The lab setup: 

  • Fujitsu Primergy RX2540 M4 with 2x Intel(R) X722 for 10GbE SFP+
    • VMware ESXi, 7.0.3, 19193900
  • 2x DELL S4112 
    • firmware 10.5.2.3 
    • VLT enabled on the 40 GbE
    • Portchannel on the uplinks to SAN 
  • DELL PowerStore 1000T
    • 2.1.1.1 (Release, Build 1690550, 2022-05-16 22:01:28, Retail)
    • 6 x 1.9 TB NVMe SSD 
  • Virtual Machine 
    • Guest OS – Windows Server 2022 
    • 8 vCPU
    • 12 GB RAM 
    • 100 GB Thick Disk on the LSI Logic SAS controller

 

The diagram of lab setup: 

 

PowerStore cabling diagram

Default MTU size 1500 

  • Latency: 0,28 ms
  • IOPS: 9177 IO/s
  • Bandwidth: 1027.7 MB/s 

 

 

Changed MTU to 9000 

  • Changed MTU in the Cluster MTU in the PowerStore to 9000
  • Changed Network Storage MTU in the PowerStore to 9000
  • Changed MTU to 9216 on the S4112 switches
    • vlan
    • port-channels
    • interfaces
  • Changed MTU on the VMkernel port to 9000
  • Changed MTU on the vSwitch to 9000 

The Performance after change MTU 

  • Latency: 0,30 ms
  • IOPS: 9973 IO/s
  • Bandwidth: 1105.1 MB/s 

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