[OmniOS-discuss] intermittent SMB performance issues -- high NT Create AndX SRT

[Geoff Nordli]

On 16-05-25 09:11 AM, Geoff Nordli wrote:
> I just upgraded an OI server to Omniosr151018.
>
> I am having some intermittent issues with the smb service with Windows 
> 7 clients.
>
> Does anyone have a dtrace script/suggestions to try to isolate it.
>
> I am running wireshark one of the traces I have show SMB service 
> response time for NT Create AndX calls is very high, with a avg of 24 
> seconds.
>
> The other commands are good:
> Read AndX avg 0.0007
> Query_File_info avg:  0.000404
> Qeury_Path_Info avg 0.000512
>
>
> Network seems fine, iperf runs at wire speed.
>
> Large files through smb are at wire speed.
>
> I have tried both SMB and SMB2.
>
> iostat doesn't reveal any bad disks, nor are the disks busy, they are 
> actually pretty idle.
>
> Pool is only at 30% full
>
> There is a 40GB arc, and the arc hit rate is very high, so everything 
> really is in arc
>
> No dedup.
>

Just to be more clear here, the delay is caused when launching an 
application.  If I copy the file from Windows explorer, the performance 
is OK.

I looked at my wireshark trace when launching the application and I 
noticed that the NT Create AndX SRT for a lot of the files is 30 
seconds.  A round number like that normally means it is triggered by 
something.  Now I just need to figure out what.

thanks,

Geoff