VMware vSphere

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  • 1.  iSCSI performance degraded

    Posted May 08, 2021 07:59 PM

    Hello All,

    Hope everyone good & safe.

    I am having old home lab i7 4th gen / 32GB / 1Gb I218 / Iomega PX4-300D (iSCSI based storage) / CISCO SG250-8 NW Switch

    I am having ESXi 6.7 running which deliver 700Mb/Sec throughput on iSCSI devices.

    Today i installed ESXi 7.0U2 and to my surprise performance is dropped to 450Mb/Sec.

    I switched back to ESXi 6.7 performance was good back to 700Mb/Sec.

    Is there any changes or tuning need to be done at ESXi 7.X hypervisor? 

    I have check basic networking everything is good.

    Did anyone faced this type of issues? or 

    Please guide me to troubleshoot!!!

    Take Care & Stay Safe.

    Pravin1CA



  • 2.  RE: iSCSI performance degraded

    Posted May 08, 2021 09:01 PM

    Added 7.0.2 Performance screenshot



  • 3.  RE: iSCSI performance degraded

    Posted May 09, 2021 09:48 AM

    Hello All,

    Updated ESXi

    ESXi version: 7.0.2

    ESXi build number: 17630552

    Still no improvement in performance

    Thanks, Pravin1CA



  • 4.  RE: iSCSI performance degraded

    Posted May 10, 2021 02:54 AM

    Hello,

    For this type of scenario, it is best to use the esxtop tool and validate the performance metrics at the storage level and thus have a clear vision of what we are looking for.

    I attach a reference link on performance metrics and storage troubleshooting so that you can compare them with the values that your ESXi returns.

    You can share the capture to give you more details of the metrics when you do the review,

    referral link.

    https://www.virtualizationhowto.com/2018/08/vmware-vsphere-esxi-storage-performance-troubleshooting/