I knew this rang a bell and I managed to find an email I got a while back about another person with a similar issue, it might help: *Windows 2012R2 and slow VFP (Visual FoxPro database) applications*
We recently had a customer where we implemented a Windows 2012R2, Citrix XenApp 7.5 environment to replace a Windows Vista/2008 client server environment. After implementing the new Citrix XenApp environment the customer found a strange phenomenon where several applications where performing slower on the new XenApp servers then on the Vista workstations.When we ran several tests on the environment and found that on a server with only the OS installed the applications worked fine. But after installing the terminal server environment and the applications the applications that where using FoxPro databases (e.g. Accountview, Caseware etc.) where running significantly slower andcrashing more often than on the old Vista workstation environment when performing specific functions inside the applications.The customer then did a installer by installer implementation of the Citrix server while testing the application after each installer. During this time consuming test they found out that after the installation of the Citrix VDA agent the problem began and we could remove the VDA agent but the problem would still persist.We then started calling Citrix and the application vendors to solve this issue and after a while we found that the problem occurs when during the VDA installation the Terminal Services role is installed. During the installation there is a settings called Disk enablefairshare that is set in the registry [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\T- SFairShare\Disk\EnableFairShare] this has a setting of 1.disable fair disk share usage
This settings allows Windows to normalize Disk I/O for users so they all have their fair share of the resources. This is what caused the problem because the FoxPro applications require a lot of disk I/O to perform and will immediatly cause issues when they don’t receive data at a fast enough rate.After changing the value to 0 the environment performed as espected! (be aware that changing the registry can cause serious trouble, always create a backup!)There is a PowerShell command you can use to check the settings at a glance: gwmi win32_terminalservicesetting -N “root\cimv2\terminalservices”The setting you need to search for is called: EnableDiskFSS (Enable Disk fair sharing)There are also two other settings that could save your day if you disable them EnableNetworkFSS (Enable network fair sharing) EnableDFSS (Enable CPU fair sharing)powershell settings
And its also possible to change these settings via registry or PowerShell! this[1] article has for more information on that. -- Alan Bourke alanpbourke (at) fastmail (dot) fm
Links:
1. http://www.ryslander.com/disable-fair-sharing-in-windows-server/
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On Fri, Jun 23, 2017 at 6:35 AM, Alan Bourke alanpbourke@fastmail.fm wrote:
I knew this rang a bell and I managed to find an email I got a while back about another person with a similar issue, it might help:
"Fair Share" -- what a great Microsoft-ism: everyone gets mediocre performance so no one hogs all the resources. What a great way to split the baby!
Thanks Alan, we will give this a try.
-----Original Message----- From: ProfoxTech [mailto:profoxtech-bounces@leafe.com] On Behalf Of Alan Bourke Sent: 23 June 2017 11:36 To: profoxtech@leafe.com Subject: Attention Chris Davis - speed issue on Server 2012.
I knew this rang a bell and I managed to find an email I got a while back about another person with a similar issue, it might help: *Windows 2012R2 and slow VFP (Visual FoxPro database) applications*
We recently had a customer where we implemented a Windows 2012R2, Citrix XenApp 7.5 environment to replace a Windows Vista/2008 client server environment. After implementing the new Citrix XenApp environment the customer found a strange phenomenon where several applications where performing slower on the new XenApp servers then on the Vista workstations.When we ran several tests on the environment and found that on a server with only the OS installed the applications worked fine. But after installing the terminal server environment and the applications the applications that where using FoxPro databases (e.g. Accountview, Caseware etc.) where running significantly slower andcrashing more often than on the old Vista workstation environment when performing specific functions inside the applications.The customer then did a installer by installer implementation of the Citrix server while testing the application after each installer. During this time consuming test they found out that after the installation of the Citrix VDA agent the problem began and we could remove the VDA agent but the problem would still persist.We then started calling Citrix and the application vendors to solve this issue and after a while we found that the problem occurs when during the VDA installation the Terminal Services role is installed. During the installation there is a settings called Disk enablefairshare that is set in the registry [HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\T- SFairShare\Disk\EnableFairShare] this has a setting of 1.disable fair disk share usage
This settings allows Windows to normalize Disk I/O for users so they all have their fair share of the resources. This is what caused the problem because the FoxPro applications require a lot of disk I/O to perform and will immediatly cause issues when they don’t receive data at a fast enough rate.After changing the value to 0 the environment performed as espected! (be aware that changing the registry can cause serious trouble, always create a backup!)There is a PowerShell command you can use to check the settings at a glance: gwmi win32_terminalservicesetting -N “root\cimv2\terminalservices”The setting you need to search for is called: EnableDiskFSS (Enable Disk fair sharing)There are also two other settings that could save your day if you disable them EnableNetworkFSS (Enable network fair sharing) EnableDFSS (Enable CPU fair sharing)powershell settings
And its also possible to change these settings via registry or PowerShell! this[1] article has for more information on that. -- Alan Bourke alanpbourke (at) fastmail (dot) fm
Links:
1. http://www.ryslander.com/disable-fair-sharing-in-windows-server/
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