Well in RH 7.1, lk 2.4.2, the option already exist under SCSI
Support -> Maximum number of SCSI diasks that can be loaded as modules. I
haven't looked at a vanilla kernel so this may be a Red Hat addition.
Wayne
EMC Corp
Centera Engineering
4400 Computer Drive
M/S F213
Westboro, MA 01580
email: Berthiaume_Wayne@xxxxxxx
"One man can make a difference, and every man should try." - JFK
-----Original Message-----
From: Matt Domsch [mailto:Matt_Domsch@xxxxxxxx]
Sent: Thursday, July 25, 2002 5:10 PM
To: linux-scsi@xxxxxxxxxxxxxxx
Subject: [PATCH] SD_EXTRA_DEVS module option
On systems with large numbers of SCSI disks, the standard value for
CONFIG_SD_EXTRA_DEVS=40 is insufficient. On systems with few SCSI disks,
the value is too big. So, how about making it a module option to sd?
Any objections the the patch below, which creates an sd_extra_devs module
option, with the default value as provided in CONFIG_SD_EXTRA_DEVS? If
the given value is too large, the current code already validates this and
limits it appropriately.
Thanks,
Matt
--
Matt Domsch
Sr. Software Engineer, Lead Engineer, Architect
Dell Linux Solutions www.dell.com/linux
Linux on Dell mailing lists @ http://lists.us.dell.com
#1 US Linux Server provider for 2001 and Q1/2002! (IDC May 2002)
--- linux-2.4/drivers/scsi/sd.c.orig 2002-07-25 16:17:35.000000000 -0500
+++ linux-2.4/drivers/scsi/sd.c 2002-07-25 16:21:56.000000000 -0500
@@ -89,6 +89,10 @@
#define SD_TIMEOUT (60 * HZ)
#define SD_MOD_TIMEOUT (75 * HZ)
+static unsigned int sd_extra_devs = SD_EXTRA_DEVS;
+MODULE_PARM(sd_extra_devs, "i");
+MODULE_PARM_DESCRIPTION(sd_extra_devs, "Number of extra SCSI disks
allowed");
+
static Scsi_Disk *rscsi_disks;
static struct gendisk *sd_gendisks;
static int *sd_sizes;
@@ -1113,7 +1117,7 @@ static int sd_init()
return 0;
if (!rscsi_disks)
- sd_template.dev_max = sd_template.dev_noticed +
SD_EXTRA_DEVS;
+ sd_template.dev_max = sd_template.dev_noticed +
sd_extra_devs;
if (sd_template.dev_max > N_SD_MAJORS * SCSI_DISKS_PER_MAJOR)
sd_template.dev_max = N_SD_MAJORS * SCSI_DISKS_PER_MAJOR;
-
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