Dit is een FAQ voor systeembeheerders 🙂

Als je Alexion CRM traag werkt en je maakt gebruikt VMwere op Windows Server 2012 of hoger dan is er een mogelijkheid dat te versnellen.

Here are some resolution but it’s not a VMware’s official one

Windows Server 2012 or above can support In-Guest unmap and trim.

That function cause a problem with VMware’s new In-Guest unmap support.

 

This function works well under Hyper-V environment but doesn’t works well with VMware’s one.

  1. Use a VM Hardware verwion 10 (ESXi 5.5 compatible) that doesn’t support In-Guest unmap.
    If you downgrade VM hardware version 10 you will escape from high disk usage.
    But you can’t never use In-Guest unmap function.
  2. Use fsutil command in Windows Guest OS – Windows Server 2012 or above –

In Windows command shell with administrative right then execute belows.
These commands will disable Windows In-Guest unmap and trim on NTFS, ReFS v1, v2.

Disable unmap and trim on NTFS & ReFS v1

fsutil behavior set DisableDeleteNotify NTFS 1

Disable unmap and trim on ReFS v2

fsutil behavior set DisableDeleteNotify ReFS 1

 

If you want to rollback to Windows unmap function execute belows

fsutil behavior set DisableDeleteNotify NTFS 0
fsutil behavior set DisableDeleteNotify ReFS 0