Re: max_scsi_luns and 2.4.19-pre10.

From: Kurt Garloff (
Date: Wed Jun 26 2002 - 07:33:37 EST

Hi Austin,

enough guesses have been there not answering your questions ...

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.)

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.

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 ...

PS: The better list for such questions is


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

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