FreeBSD multi Lun detection query

[Desai, Kashyap]

> -----Original Message-----
> From: Kenneth D. Merry [mailto:ken at freebsd.org]
> Sent: Wednesday, April 04, 2012 8:58 PM
> To: Desai, Kashyap
> Cc: freebsd-scsi at freebsd.org; McConnell, Stephen; gibbs at freebsd.org
> Subject: Re: FreeBSD multi Lun detection query
> 
> On Wed, Apr 04, 2012 at 11:03:04 +0530, Desai, Kashyap wrote:
> > Hi,
> >
> > Our test team has one test case, where they need to verify multi lun
> detection by FreeBS8.2 OS.
> > Here are the steps to reproduce.
> >
> > Step 1: Configured Multi-Luns in RBOD (DOTHILL) and map to controller
> which is booted with FreeBSD
> > Step 2: Issue the command "camcontrol rescan all" and "camcontrol dev"
> >
> > Expected Result: the command should display all the configured luns
> >
> > Actual Result: Only the first Lun is discovered
> >
> > Note: When we issue explicit scan using "camcontrol rescan
> bus:target:lun", it detects that specific lun.
> >
> > Query: How does FreeBSD detect multi luns ? Driver issue
> XPT_BUS_RESCAN and expect OS should detect both the luns.
> > Is there any limitation associated with multi lun in FreeBSD ?
> 
> A couple of questions:
> 
>  - Do you have change 231716 in your version of the driver?  The max_lun
>    field of the path inquiry CCB was set to 0, which disabled multiple
> LUN
>    scanning.  I set it to 8, but in reality it needs to be set to the
>    maximum LUN supported by the chip.

Hi Ken, This is very good information. I was not aware of this max_lun field.
We used FreeBSD-8.2-RELEASE. I can ask test team to verify with latest upstream.(rev 231716)

What about FreeBSD-9-RELEASE ? Is max_luns are set to non-zero. ?

> 
>  - What LUN numbers do you have configured on the array?

Not sure what is correct answer for this. _but_ we have created two luns. And expected to see lun 0 and lun 1.

~ Kashyap

> 
> Ken
> --
> Kenneth Merry
> ken at FreeBSD.ORG