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From: Alexander Motin <mav@FreeBSD.org>
Date: Tue, 15 Mar 2011 06:53:33 +0000 (UTC)
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Subject: svn commit: r219659 - projects/graid/head/sys/geom/raid
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Author: mav
Date: Tue Mar 15 06:53:33 2011
New Revision: 219659
URL: http://svn.freebsd.org/changeset/base/219659

Log:
  Prefer to use CONCAT transformation module for any array with only one disk.
  AMD/ATI RAID BIOS for some reason writes RAIDREADY disk as 1-disk RAID0,
  not as JBOD. Not sure Promise BIOS does the same to just map it at MD.
  1-disk RAID0 is also works fine, but CONCAT is more efficient there.

Modified:
  projects/graid/head/sys/geom/raid/tr_concat.c

Modified: projects/graid/head/sys/geom/raid/tr_concat.c
==============================================================================
--- projects/graid/head/sys/geom/raid/tr_concat.c	Tue Mar 15 06:07:02 2011	(r219658)
+++ projects/graid/head/sys/geom/raid/tr_concat.c	Tue Mar 15 06:53:33 2011	(r219659)
@@ -73,7 +73,7 @@ static struct g_raid_tr_class g_raid_tr_
 	"CONCAT",
 	g_raid_tr_concat_methods,
 	sizeof(struct g_raid_tr_concat_object),
-	.trc_priority = 100
+	.trc_priority = 50
 };
 
 static int
@@ -83,7 +83,9 @@ g_raid_tr_taste_concat(struct g_raid_tr_
 
 	trs = (struct g_raid_tr_concat_object *)tr;
 	if (tr->tro_volume->v_raid_level != G_RAID_VOLUME_RL_SINGLE &&
-	    tr->tro_volume->v_raid_level != G_RAID_VOLUME_RL_CONCAT)
+	    tr->tro_volume->v_raid_level != G_RAID_VOLUME_RL_CONCAT &&
+	    !(tr->tro_volume->v_disks_count == 1 &&
+	      tr->tro_volume->v_raid_level != G_RAID_VOLUME_RL_UNKNOWN))
 		return (G_RAID_TR_TASTE_FAIL);
 	trs->trso_starting = 1;
 	return (G_RAID_TR_TASTE_SUCCEED);