Re: max_scsi_luns and 2.4.19-pre10.

From: Austin Gonyou (
Date: Wed Jun 26 2002 - 09:18:45 EST

On Wed, 2002-06-26 at 07:33, Kurt Garloff wrote:
> Hi Austin,
> enough guesses have been there not answering your questions ...

Sure I hear that. But I posted an earlier question about QLA2200 and a
PV 660F and not seeing > 8 luns with 2.4.19-pre10.

> On Tue, Jun 25, 2002 at 07:46:25PM -0500, Austin Gonyou wrote:
> > This originally was asking for help regarding QLA2200's, but I've since
> > discovered it's a kernel param problem that I'm not sure how to solve.
> >
> > Using a default RH kernel (from SGI XFS installer) and passing
> > max_scsi_luns=128 in grub, and for scsi_mod, it seems to work.
> In 2.4.19pre1 a patch was merged into mainline which introduced a flag
> BLIST_LARGELUN and set it for EMC Symmetrix devices. Some distributors
> (incl. RH and SuSE) did ship kernels with this patch included.
> (An older patch for 2.4.16 exists as well.)

I'll take a look at that, and see if I can merge it into -aa4.

> The flag does allow a device to use more than 8 LUNs despite it reporting
> as SCSI Version 2 devices (which can not support more than 8 LUNs normally
> ...)
> The flag also needs to be set for some more devices, look for DGC, DELL, CMD
> and CNSi/CNSI devices that already have the BLIST_SPARSELUN flag.

This would be a DELL device, so I'll see about changing it from

> But as you did not post the output of /proc/scsi/scsi nor the syslog
> meesages from your SCSI subsystem nobody knows what devices you're using or
> what actually happens. Just speculations ...

There's nothing to post from /proc/scsi/scsi or the syslog other than
there's no more than 8 devices on my FC chain. I guess the real point
here is that if you're using FC, you're probably going to use more than
8 luns, even if not immediately. Especially for large Databases.

> PS: The better list for such questions is

That makes sense I'll post to that list immediately and see what I can
get. Sorry for the confusion.

> Regards,
> --
> Kurt Garloff <> Eindhoven, NL
> GPG key: See mail header, key servers Linux kernel development
> SuSE Linux AG, Nuernberg, DE SCSI, Security

Austin Gonyou <>
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