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VMware vSphere Best Practices Guide for the Pure Storage® FlashArray

Quick Reference: Best Practice Settings 

This is the quick reference guide to our recommended changes.  If you would like a more in-depth explanation including where these settings reside, please continue to the VMware vSphere Best Practices Guide for the Pure Storage® FlashArray  document. 

 ESXi Parameters

 Recommended 

 Default 

 Description

VMware Tools

Install

Not Installed

VMware paravirtual driver, clock sync, increased disk timeouts, and graphic support are part of the tools hence it is crucial step.

HardwareAcceleratedMove

1

1

Enables and controls use of XCOPY on ESXi.

HardwareAcceleratedInit

1

1

Enables and controls use of Block Same AKA WRITESAME

VMFS3.HardwareAcceleratedLocking

1

1

Enables and controls the use of Atomic Test & Set (ATS)

MaxHWTransferSize

16384*

*Recommended for ESXi prior to 6.5.  In ESXi 6.5+ please use the default

4096

Controls the maximum size a single XCOPY SCSI command can describe, 16384 KB is the maximum

EnableBlockDelete (vSphere 6.x only)

1

0

Disabled by default.  Provides for end-to-end in-guest support for Space Reclamation/UNMAP

Path Selection Policy

Round Robin

MRU

Path selection policy for FC and iSCSI.

IO Operations Limit (Path Switching)

1

1000

How many IOPS until we switch to another path.

TCP Delayed ACK (iSCSI)

Disabled

Enabled 

 

iSCSI Login Timeout

30

5

 

Jumbo Frames (Optional)

 

9000 1500  Change at your discretion.
 Disk.DiskMaxIOSize  4096  32768

Dictates the largest IO the ESXi kernel will transmit. This must be lowered when using EFI-enabled virtual machines, or using VMware vSphere Replication.

 ESXi 5.5 UNMAP Block Count  1% of the free VMFS space  200 Refer to the VAAI or Best Practices document for more information.

You can download the PDF file here, or you can view the inline copy below:

If you are unable to see the PDF inline, you can click here to download the PDF file.