diff -pur linux-2.6.18-53.orig/drivers/md/raid5.c linux-2.6.18-53/drivers/md/raid5.c
--- linux-2.6.18-53.orig/drivers/md/raid5.c	2007-12-06 17:23:39.000000000 +0800
+++ linux-2.6.18-53/drivers/md/raid5.c	2007-12-06 17:24:14.000000000 +0800
@@ -57,7 +57,7 @@
  * Stripe cache
  */
 
-#define NR_STRIPES		256
+static int raid5_nr_stripes = 256 * 8;
 #define STRIPE_SIZE		PAGE_SIZE
 #define STRIPE_SHIFT		(PAGE_SHIFT - 9)
 #define STRIPE_SECTORS		(STRIPE_SIZE>>9)
@@ -3230,7 +3230,7 @@ static int run(mddev_t *mddev)
 	else
 		conf->max_degraded = 1;
 	conf->algorithm = mddev->layout;
-	conf->max_nr_stripes = NR_STRIPES;
+	conf->max_nr_stripes = raid5_nr_stripes;
 	conf->expand_progress = mddev->reshape_position;
 
 	/* device size must be a multiple of chunk size */
@@ -3821,6 +3821,7 @@ static void raid5_exit(void)
 
 module_init(raid5_init);
 module_exit(raid5_exit);
+module_param(raid5_nr_stripes, int, 0644);
 MODULE_LICENSE("GPL");
 MODULE_ALIAS("md-personality-4"); /* RAID5 */
 MODULE_ALIAS("md-raid5");
Only in linux-2.6.18-53/drivers/md: raid5.c.orig
Only in linux-2.6.18-53.orig/include/linux/raid: .raid5.h.swp