On Mon, 2007-08-27 at 23:01 +0200, Tore Anderson wrote:
> * Chandra Seetharaman
>
> > tur checker just sends a test unit ready to see if the path is good.
> > Whereas rdac sends a c9 page inquiry and determines the state of the
> > path.
>
> Okay. I'm not really sure if I understand what practical difference
> there is between the two, though... The TUR check seems to fail like
> it's supposed to if the path goes bad.
In RDAC mode, tur will always fail on the passive path. You do not see
that ?
>
> > That is true. But, I am wondering if what you have is based on the
> > LSI Engenio based controller (and hence the controller does not
> > understand the MODE_SELECT command).
>
> It's an Engenio 3994 that came with a sticker on it that says Sun
> StorageTek 6140.
>
> > What mode do you have your storage device configured in ? rdac or AVT
> > ?
>
> Host-type "Linux", which means RDAC (AVT is mostly unusable for
> clusters because of all the unwanted volume transfers it causes). It's
> supposed to be used with LSI's RDAC 09.01.B2.xx driver, but that one
> doesn't work with recent kernels unfortunately.
>
> > Where did you get mpath_prio_rdac from ?
> >
> > In 0.4.7 you could use mpath_prio_tpc instead (it behaves exactly as
> > mpath_prio_rdac in 0.4.8).
>
> I got it from the 0.4.8 sources - mpath_prio_tpc complained a lot
> about AVT mode being disabled, which screwed up my multipath -ll output
> so I just got the new version instead.
You mean mpath_prio_tpc from 0.4.7 ? I use it all the time in both RDAC
and AVT mode with no issues.
>
> > Can you apply the attached debug patch, repeat your test and send me
> > the log.
>
> Sure, but I think you forgot to actually attach the patch... (Happens
> to me too all the time!)
oops :)... attached
>
> Regards
--
----------------------------------------------------------------------
Chandra Seetharaman | Be careful what you choose....
- sekharan@xxxxxxxxxx | .......you may get it.
----------------------------------------------------------------------
Index: linux-2.6.22/drivers/md/dm-mpath-rdac.c
===================================================================
--- linux-2.6.22.orig/drivers/md/dm-mpath-rdac.c
+++ linux-2.6.22/drivers/md/dm-mpath-rdac.c
@@ -229,6 +229,13 @@ static void mode_select_endio(struct req
struct scsi_sense_hdr sense_hdr;
int sense = 0, fail = 0;
+ DMINFO("MODE_SELECT of %s returned error %d; host_byte 0x%x, "
+ "msg_byte 0x%x, status_byte 0x%x\n",
+ h->path->dev->name, error,
+ host_byte(req->errors),
+ msg_byte(req->errors),
+ status_byte(req->errors));
+
if (had_failures(req, error)) {
fail = 1;
goto failed;
--
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