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Albert Widjaja
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Modifying ESXi hosts MaxHWTransferSize, IOPSValue and ATSMode to achieve best performance & reliability ?

Hi People,

This is another follow Up thread from: https://www.experts-exchange.com/questions/28974117/VMware-VMFS-datastore-LUN-PSP-and-settings-differences-across-different-ESXi-hosts.html

When I produce the report of the Best Practice in VMware ESXi deployment with All Flash Array (SSD), I noticed that there are two items I need to set:

The VAAI XCOPY MaxHWTransferSize for this host is incorrect: 4096
This should be set to 16386 (16 MB).

Some of the VMFS LUNs in the multiple ESXi hosts are displaying IOPSValue as N/A and some of them 1000
This should be set to 1. --> Why the value is changed significantly from 1000 into 1 ?

All of the VMFS LUNs in the entire ESXi hosts are displaying ATSMode as N/A.
This should be set to enabled.

Does any ofthose settings can cause any impact or outage to the Production environment or the VMs ?
I'm thinking to configure it just on one ESXi host and hten moving on to the other ESXi host the next day.

Any help and suggestion would be greatly appreciated.

VMwareVirtualizationStorage HardwareStorage

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Albert Widjaja

8/22/2022 - Mon