diff -ru linux-orig/drivers/md/raid5.c linux-new/drivers/md/raid5.c
--- linux-orig/drivers/md/raid5.c	2009-04-14 08:11:38.000000000 +1000
+++ linux-new/drivers/md/raid5.c	2009-09-20 05:02:02.000000000 +1000
@@ -3595,10 +3595,16 @@
 	mddev->array_size =  mddev->size * (conf->previous_raid_disks -
 					    conf->max_degraded);
 
+	int stripe_size = conf->chunk_size * (conf->previous_raid_disks - conf->max_degraded);
+
 	/* in order to support large I/Os */
-	blk_queue_max_sectors(mddev->queue, conf->chunk_size * conf->previous_raid_disks >> 9);
-	mddev->queue->max_phys_segments = conf->chunk_size * (conf->previous_raid_disks - conf->max_degraded) >> PAGE_SHIFT;
-	mddev->queue->max_hw_segments = conf->chunk_size * conf->previous_raid_disks >> PAGE_SHIFT;;
+	blk_queue_max_sectors(mddev->queue, stripe_size >> 9);
+	/* KTVM: set default max_sectors the same as the max_hw_sectors set above */
+	mddev->queue->max_sectors = mddev->queue->max_hw_sectors;
+	printk("%s: setting max_sectors = %d, max_hw_sectors = %d\n", mdname(mddev), mddev->queue->max_sectors, mddev->queue->max_hw_sectors);
+
+	mddev->queue->max_phys_segments = stripe_size >> PAGE_SHIFT;
+	mddev->queue->max_hw_segments = stripe_size >> PAGE_SHIFT;;
 
 	/* raid5 device is able to do zcopy right now. */
 	mddev->queue->backing_dev_info.capabilities |= BDI_CAP_PAGE_CONSTANT_WRITE;