On Fri, Mar 20, 2009 at 08:04:56AM +0100, Ulrich Windl wrote:
> 
> Hi,
> 
> is it correct that a No-Op is handled entirely withing the iSCSI layer (i.e. 
> no 
> command is sent to the actual device), while a TUR (multipathd) is answered 
> by the 
> device?

Correct.
> 
> I saw that the Microsoft Initiator is using No-Ops. Using TUR with Linux, I 
> had 
> some cases where the reply timed out. So that could be a network problem or a 
> device problem. If the No-Op is handled without the device, I could change 
> the 

Likely a device problem. That is if you don't see any reconnection/connection
errors in the dmesg. If you do that is the Nop-out not getting received
within the right timing windows (10 seconds by default).

> test to find out what part is causing the delays.
> 
> Regards,
> Ulrich
> 
> 
> 

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