From mboxrd@z Thu Jan  1 00:00:00 1970
From: Hannes Reinecke <hare@suse.de>
Subject: Re: Multipath issues with kernel device errors
Date: Wed, 29 Aug 2007 08:14:39 +0200
Message-ID: <46D50ECF.6020701@suse.de>
References: <8CED8CEBA23FC0409E1A3009F7F47BE502471065@exchange.g2switchworks.com>	<1188333723.12737.7.camel@linuxchandra>	<8CED8CEBA23FC0409E1A3009F7F47BE502471086@exchange.g2switchworks.com>
	<1188338656.12737.18.camel@linuxchandra>
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Chandra Seetharaman wrote:
> You do not have the latest table.=20
> Try with the table below (converted from 0.4.8 version's hwtable.c)
> devices {
> 	device {
> 		vendor 		"COMPAQ"
> 		product		"MSA1000"
> 		path_grouping_policy	group_by_prio
> 		path_checker	tur
> 		prio_callout	"/sbin/mpath_prio_alua /dev/%n"
> 		getuid_callout	"/sbin/scsi_id -g -u -s /block/%n"
> 		failback	immediate
> 	}
> }
>=20
Errm. Not quite. My sources indicate that this machine
runs the older active/passive firmware, which requires
the 'hp_sw' hardware handler to run properly.

So better use this:
devices {
	device {
		vendor 		"COMPAQ"
		product		"MSA1000"
		hardware_handler	"1 hp_sw"
		path_grouping_policy	group_by_prio
		path_checker	hp_sw
 		prio_callout	"/sbin/mpath_prio_hp_sw /dev/%n"
 		getuid_callout	"/sbin/scsi_id -g -u -s /block/%n"
 		failback	manual
 	}
}

if mpath_prio_hp_sw is missing complain to Ben Marzinski :-)
Alternatively you can use

path_grouping_policy	failover

and omit the prio_callout altogether. But then only one path
per SP are used.

Cheers,

Hannes
--=20
Dr. Hannes Reinecke		      zSeries & Storage
hare@suse.de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 N=FCrnberg
GF: Markus Rex, HRB 16746 (AG N=FCrnberg)