Re: iSCSI opcode 0x3c vendor specific

[The Lee-Man]

On Thursday, February 15, 2018 at 6:52:23 PM UTC-8, Jim Gunnarsson wrote:
>
> Hey
>
> I currently tweaking the configuration settings for open-iscsi on RHEL 7 
> with 
> Oracle Database 11g as load. It works, but can be improved. 
>
> During a tcpdump of the traffic flow I found an outbound, to me, unknown 
> iSCSI opcode 0x3c witch is denoted as vendor specific. 
>
> The PDU look like this:
>
>    bc 8f 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0010   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
> 0020   00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
>
> No initiator task is present. The final flag is set. The operation is
> requested reapeted number of times. The package size is 65228,
> with what looks alignment marks.
>
> Anyone who have idea what is requested ? 
> Is this opcode documented somethere ?
>
> Thanks 
> // Jim G
>
> I have seen this opcode before, though I can't find a reference at the 
moment.

Bottom line is that it's some vendor-specific check for something, and it 
should be harmless.

 

>  
>

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Re: 4.14.16 kworker deathspin if logged out without deleting scsi devices

[The Lee-Man]

On Thursday, February 15, 2018 at 2:41:11 PM UTC-8, Maxim Ivanov wrote:
>
> Investigating it further, it looks like it is working fine if multipathd 
> didn't start at all (unit is masked). If it was started, then stopped, 
> logout hangs.  
>

I just tested on Tumbleweek, using a 4.15 kernel. I tried various 
combinations of running multipathd and iscsid and logging into and out of a 
target. I never got a kernel spin.

My setup is from a VmWare virtual machine, talking to an iSCSI LIO target 
on my laptop (running Leap 42.2). I have only one target, and no multipath 
configured. 

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