Re: Sparse LUN scanning - 2.4.x

[Michael Clark <michael@metaparadigm.com>]

Jim Zajkowski wrote:

> Hi there,
>
> We have an Apple Xserve RAID, connected through a FC switch.  The RAID 
> has LUN-masking enabled, such that one of our Linux boxes only gets 
> LUN 1 and not LUN 0.  We're running the 2.4.x kernel series now, since 
> this is under a RHEL envinronment.
>
> The problem is this: since LUN 0 does not show up -- specifically, it 
> can't read the vendor or model informaton -- the kernel SCSI scan does 
> not match with the table to tell the kernel to do sparse LUN 
> scanning... so the RAID does not appear.
>
> I can make the RAID show up by injecting a add-single-device to the 
> SCSI proc layer.  Trivially patching scsi_scan.c to always do sparse 
> scanning works as well.  No hokery with max_scsi_luns or ghost devices 
> works.
>
> I'm considering making a patch to add a kernel option to force sparse 
> scanning.  Is there a better way?
>
Add the Xserve with the BLIST_SPARSELUN flag into the blacklist/quirks 
table in drivers/scsi/scsi_scan.c

~mc