#FSUTIL DISABLEDELETENOTIFY UPDATE#
#FSUTIL DISABLEDELETENOTIFY WINDOWS#

With my client's situation fresh on my mind I quickly tried applying the DisableDeleteNotify=1 settings and the problem went away immediately. We are on Dell-customized 6.5.0 build 8935087. We immediately began having file I/O problems that felt very similar to those that my client had on their system a couple weeks ago, described above.

#FSUTIL DISABLEDELETENOTIFY UPDATE#

Then this past Sunday morning I installed two Microsoft updates to our primary file and print server ( KB890830 – Malicious Software Removal Tool and KB4480961 – Cumulative Update from January 8).

#FSUTIL DISABLEDELETENOTIFY WINDOWS#

Windows Server OS on the problematic server is 2016. It's been a couple of weeks now and the performance has been great. After running both the NTFS and the ReFS commands and rebooting the server the file I/O problem was GONE. Therefore I was skeptical that setting DisableDeleteNotify to 1 would correct the problem. The article linked above describes the problem as being corrected in 6.5 U1. The client's system runs Dell-customized ESXi 6.5.0 Build 8294253, which is 6.5 U2. After a little more testing and a call to VMware the first thing that was suggested was to try the DisableDeleteNotify settings mentioned above in this thread. Next we migrated our test machine to be on the same host as the new, problematic server and the file I/O was great. We then tested from a VM and saw the same thing. We first confirmed the behavior from a physical machine. However when there was any file I/O initiated from a physical machine where the file resided on this new VM, the file I/O was so poor as to be unusable. Other existing VMs (brought over from the old vSphere 5.5 system) were running fine. Therefore if you find yourself in a 'Very poor file I/O performance with Windows 2016 and VMware ESXi 6.5' (any version, I say) then these commands are worth a try.įirst a client called us with a problem on a brand new VM that was built on their brand new VMware 6.5 platform on their brand new SAN and host hardware. The crux is that the 'DisableDeleteNotify' settings corrected the problems in both occurrences. This thread was very useful to me recently, but the issue has some differences with some of the situations described in other posts and in this article. If you disable In-Guest unmap but you can unmap on VMFS with vmfstools command manually.:) If you want to rollback to Windows unmap function execute belowsįsutil behavior set DisableDeleteNotify NTFS 0įsutil behavior set DisableDeleteNotify ReFS 0

disable unmap and trim on NTFS & ReFS v1įsutil behavior set DisableDeleteNotify NTFS 1įsutil behavior set DisableDeleteNotify ReFS 1 These commands will disable Windows In-Guest unmap and trim on NTFS, ReFS v1, v2.

In Windows command shell with administrative right then execute belows. Use fsutil command in Windows Guest OS - Windows Server 2012 or above. If you downgrade VM hardware version 10 you will escape from high disk usage.īut you can't never use In-Guest unmap function.Ġ2. Use a VM Hardware verwion 10 (ESXi 5.5 compatible) that doesn't support In-Guest unmap. This function works well under Hyper-V environment but doesn't works well with VMware's one.Ġ1. That function cause a problem with VMware's new In-Guest unmap support. Windows Server 2012 or above can support In-Guest unmap and trim. Here are some resolution but it's not a VMware's official one.

Fsutil disabledeletenotify