How to handle Test Unit Ready command

[Hongjiang Zhang]

Thanks Scott. It works for me.

You help resolve an issue which confused me for a long time. :-) Before that I have tried "CAM_DEV_NOT_THERE" for invalid LUN, but it blocks the scan for higher LUN than 7.

-----Original Message-----
From: Scott Long [mailto:scott4long at yahoo.com] 
Sent: Tuesday, August 16, 2016 1:57 AM
To: Hongjiang Zhang <honzhan at microsoft.com>
Cc: freebsd-scsi at freebsd.org
Subject: Re: How to handle Test Unit Ready command

The right way to do it in CAM is to respond with CAM_SEL_TIMEOUT.  If you respond with something like CAM_DEV_NOT_THERE, I think it’ll trigger error recovery, retries, and ugly console messages.  Probably should fix that if it hasn’t been done already.

Scott

> On Aug 15, 2016, at 3:01 AM, Hongjiang Zhang via freebsd-scsi <freebsd-scsi at freebsd.org> wrote:
> 
> Hi,
> 
> I'm developing the SCSI storage driver for FreeBSD on Hyper-V. When the host side hot removed a scsi disk from LUN 0, there will a TUR command issued from VM side. But what is the expected TUR response if the specified LUN is invalid?
> 
> Thanks
> Hongjiang Zhang
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