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[nutznboltz <kstailey@xxxxxxxxx>]

When the server was first built as Lucid sdb not only faulted when it
was re-syncing, a replacement sdb also faulted during re-syncing.  The
second replacement drive worked fine once the server was rebuilt as
Hardy; I haven't retried the first one.

looking at the patch in
http://kerneltrap.org/mailarchive/linux-scsi/2010/4/26/6884716
it appears you are actually supposed to use blk_queue_update_dma_alignment()
but the difference it makes is trivial in reality.

diff -u mptscsih.c.DIST mptscsih.c
--- mptscsih.c.DIST     2010-05-12 10:35:04.326544905 -0400
+++ mptscsih.c  2010-05-12 16:23:40.948596315 -0400
@@ -2363,6 +2363,9 @@
                ioc->name,sdev->tagged_supported, sdev->simple_tags,
                sdev->ordered_tags));
 
+       blk_queue_update_dma_alignment(sdev->request_queue, 512 - 1);
+       printk(KERN_INFO, "sdev->request_queue->dma_alignment set to %d", sdev->request_queue->dma_alignment);
+
        return 0;
 }
 
but no joy.  The printk message shows up twice in the dmesg output but 

May 12 16:57:54 eeekamouse kernel: [  662.544667] sd 6:0:1:0: [sdb] Sense Key : Recovered Error [current] [descriptor]
May 12 16:57:54 eeekamouse kernel: [  662.544681] Descriptor sense data with sense descriptors (in hex):
May 12 16:57:54 eeekamouse kernel: [  662.544687]         72 01 00 1d 00 00 00 0e 09 0c 00 00 00 00 00 00 
May 12 16:57:54 eeekamouse kernel: [  662.544705]         00 00 00 00 00 00 
May 12 16:57:54 eeekamouse kernel: [  662.544715] sd 6:0:1:0: [sdb] Add. Sense: ATA pass through information available
May 12 16:57:54 eeekamouse kernel: [  662.570602] sd 6:0:1:0: [sdb] Sense Key : Recovered Error [current] [descriptor]
May 12 16:57:54 eeekamouse kernel: [  662.570616] Descriptor sense data with sense descriptors (in hex):
May 12 16:57:54 eeekamouse kernel: [  662.570621]         72 01 00 1d 00 00 00 0e 09 0c 00 00 00 00 00 00 
May 12 16:57:54 eeekamouse kernel: [  662.570640]         00 00 00 00 00 00 
May 12 16:57:54 eeekamouse kernel: [  662.570649] sd 6:0:1:0: [sdb] Add. Sense: ATA pass through information available

-- 
Karmic not working on a Dell 7400
https://bugs.launchpad.net/bugs/474207
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