SMB poor performance after disabling SMB1

[markwilfan]

Hey guys

 

Anybody experiencing slow SMB performance after disabling SMB1? We have disabled it on the clients (Win 7) and Servers (Win 2012 R2, 2016) and now we have weird performance issues on the staff file server. All other servers seem fine but saving the a users N: from Office seems very slow. The server in question is our last remaining physical non-HyperV server and is sat their doing not much so it can't be a load issue.

 

Mark

[ZeroHour]

Does server to server have the speed issues?

If you happen to have a Windows 10 machine it may be worth testing that as well.

How did you disable SMBv1?

[mrwoberts]

Mark

 

I've had issues myself regarding disabling SMB1 - not least with a Ricoh MFP that will need changing over to FTP to restore scanning functionality.

 

However, here's the script I used to resolve the SMB1 for both Server (2008 R2) and Windows 7 clients.

REG ADD HKLM\SYSTEM\CurrentControlSet\services\LanmanServer\Parameters /v SMB1 /t REG_DWORD /d 0 /f
REG ADD HKLM\SYSTEM\CurrentControlSet\services\LanmanWorkstation\Parameters /v SMB1 /t REG_DWORD /d 0 /f

sc.exe config lanmanserver      depend= samss/srv2
sc.exe config lanmanworkstation depend= bowser/mrxsmb20/nsi

sc.exe config mrxsmb10  start= disabled
sc.exe config mrxsmb    start= auto
sc.exe config mrxsmb20  start= auto

sc.exe config srv       start= disabled
sc.exe config srv2      start= auto

net stop server
net stop mrxsmb10
net stop srv

net start mrxsmb20
net start srv2
net start server

[ZeroHour]

Mark

 

I've had issues myself regarding disabling SMB1 - not least with a Ricoh MFP that will need changing over to FTP to restore scanning functionality.

 

However, here's the script I used to resolve the SMB1 for both Server (2008 R2) and Windows 7 clients.

REG ADD HKLM\SYSTEM\CurrentControlSet\services\LanmanServer\Parameters /v SMB1 /t REG_DWORD /d 0 /f
REG ADD HKLM\SYSTEM\CurrentControlSet\services\LanmanWorkstation\Parameters /v SMB1 /t REG_DWORD /d 0 /f

sc.exe config lanmanserver      depend= samss/srv2
sc.exe config lanmanworkstation depend= bowser/mrxsmb20/nsi

sc.exe config mrxsmb10  start= disabled
sc.exe config mrxsmb    start= auto
sc.exe config mrxsmb20  start= auto

sc.exe config srv       start= disabled
sc.exe config srv2      start= auto

net stop server
net stop mrxsmb10
net stop srv

net start mrxsmb20
net start srv2
net start server

 

I was going to link him to your post in case it helped

[mrwoberts]

Bizarrely, the smb1 (mrxsmb10) driver/service was started on an updated Window 10 system; I imagine it would prefer SMB2+ but I ran the script on that and it hasn't caused any problems so far. Rebooted and mapped drives without a problem... Edited May 16, 2017 by mrwoberts

[markwilfan]

Does server to server have the speed issues?

If you happen to have a Windows 10 machine it may be worth testing that as well.

How did you disable SMBv1?

I use win 10 myself. No probs to the server in question. Server disk performance is good. Hadn't tried server to server yet.

[markwilfan]

I used https://www.techwhisperer.ca/2017/03/04/disable-smb1-with-powershell-and-sccm/ to disable site wide.

 

Like I said it is just 1 server with win 7 that is the issue. Perplexed

[markwilfan]

After loads of various tests last night I rebooted the server as soon as everybody had gone to bed and it seemed to have alleviated the slow performance. Really odd. Discovered that both the OS and DATA partitions are RAID5 joy of joys.