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RE: [dm-devel] Multipath issues with kernel device errors



Are the errors in the kernel log normal:


Aug 28 10:30:15 rac02 kernel: end_request: I/O error, dev sdf, sector 513824
Aug 28 10:30:15 rac02 kernel: Buffer I/O error on device sdf, logical block 64228
Aug 28 10:30:15 rac02 kernel: Buffer I/O error on device sdf, logical block 64229
Aug 28 10:30:15 rac02 kernel: Buffer I/O error on device sdf, logical block 64230
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64231
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64232
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64233
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64234
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64235
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64236
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64237
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64238
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64239
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64240
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64241
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64242
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64243
Aug 28 10:30:16 rac02 kernel: Device sdf not ready.
Aug 28 10:30:16 rac02 kernel: end_request: I/O error, dev sdf, sector 513824
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64228
Aug 28 10:30:16 rac02 kernel: Device sdf not ready.
Aug 28 10:30:16 rac02 kernel: end_request: I/O error, dev sdf, sector 513824
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64228
Aug 28 10:30:16 rac02 kernel: Device sdf not ready.
Aug 28 10:30:16 rac02 kernel: end_request: I/O error, dev sdf, sector 514064
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64258
Aug 28 10:30:16 rac02 kernel: Device sdf not ready.
Aug 28 10:30:16 rac02 kernel: end_request: I/O error, dev sdf, sector 513680
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64210
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64211
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64212
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64213
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64214
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64215
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64216
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64217
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64218
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64219
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64220
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64221
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64222
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64223
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64224
Aug 28 10:30:16 rac02 kernel: Buffer I/O error on device sdf, logical block 64225
Aug 28 10:30:16 rac02 kernel: Device sdf not ready.


Thanks,

JB


-----Original Message-----
From: dm-devel-bounces redhat com [mailto:dm-devel-bounces redhat com] On Behalf Of Hannes Reinecke
Sent: Wednesday, August 29, 2007 1:15 AM
To: device-mapper development
Subject: Re: [dm-devel] Multipath issues with kernel device errors

Chandra Seetharaman wrote:
> You do not have the latest table. 
> 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
> 	}
> }
> 
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
-- 
Dr. Hannes Reinecke		      zSeries & Storage
hare suse de			      +49 911 74053 688
SUSE LINUX Products GmbH, Maxfeldstr. 5, 90409 Nürnberg
GF: Markus Rex, HRB 16746 (AG Nürnberg)

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