[dm-devel] Avoid Error Messages in /var/log/messages EMC CX300

[Edward Goggin]

These errors are caused by Linux system applications, (e.g., blkid(8),
hwinfo(8)), which issue read/write i/o directly to target device paths
(i.e., /dev/sdh in your example) which are in a passive/standby state.
 
Although the errors are benign, there can be a lot of them and it makes
it difficult to discern the ones which are not benign.


________________________________

	From: dm-devel-bounces at redhat.com
[mailto:dm-devel-bounces at redhat.com] On Behalf Of Herr, Manuel
	Sent: Wednesday, September 27, 2006 6:27 AM
	To: dm-devel at redhat.com
	Subject: [dm-devel] Avoid Error Messages in /var/log/messages
EMC CX300
	
	

	Hi there, 
	i get Error Messages in my logfiles when I boot the System and
then, approx. every 10 Minutes, or during an hwinfo. 
	The Server is connected to an EMC CX 300 through 1 Qlogic HBA. 
	The Messages only appear for the failover Device. In my Example
for /dev/sdh. 

	#multipath -ld 
	sapdata (36006016040321900600487993216db11) 
	[size=133 GB][features="1 queue_if_no_path"][hwhandler="1 emc"] 
	\_ round-robin 0 [active] 
	 \_ 3:0:1:6 sdp 8:240 [active][ready] 
	\_ round-robin 0 [enabled] 
	 \_ 3:0:0:6 sdh 8:112 [active][ready] 
	*snip* 

	#fdisk -l /dev/sdp 
	Disk /dev/sdp: 143.0 GB, 143034155008 bytes 
	255 heads, 63 sectors/track, 17389 cylinders 
	Units = cylinders of 16065 * 512 = 8225280 bytes 

	   Device Boot      Start         End      Blocks   Id  System 
	/dev/sdp1               1       17389   139677111   83  Linux 

	#fdisk -l /dev/sdh 
	--> Generates this Error in /var/log/messages 
	Sep 27 12:17:44 saptf2 kernel: end_request: I/O error, dev sdh,
sector 0 
	Sep 27 12:17:44 saptf2 kernel: Buffer I/O error on device sdh,
logical block 0 


	Configuration: 
	/etc/multipath.conf 
	defaults { 
	        default_features "1 queue_if_no_path" 
	} 

	multipaths { 
	        multipath 
	        { 
	                #mountpoint /sapdb/PF1/sapdata 
	                wwid 36006016040321900600487993216db11 
	                alias sapdata 
	        } 
	*snip* (some more aliases for other LUNs) *snip* 
	} 
	devices { 
	        device { 
	                vendor                  "DGC  " 
	                product                 "*" 
	                path_grouping_policy    group_by_prio 
	                getuid_callout          "/sbin/scsi_id -g -u -s
/block/%n" 
	                path_checker            emc_clariion 
	                features                "1 queue_if_no_path" 
	                hardware_handler        "1 emc" 
	                failback                immediate 
	                prio_callout            "/sbin/mpath_prio_emc
/dev/%n" 
	                no_path_retry           300 
	        } 
	} 

	Loaded Modules: 
	dm_emc                 23808  1 
	dm_round_robin         20480  1 
	dm_multipath           38800  3 dm_emc,dm_round_robin 
	dm_mod                 77536  23 dm_multipath 
	qla2300               141696  0 
	qla2xxx               356192  33 qla2300 

	#modinfo qla2300 
	version:        8.01.02-sles DBB4213CE377B7165AFB8AC 

	#modinfo qla2xxx 
	version:        8.01.02-sles F6D31250031AEB3A3B9138A 

	Kernel: 
	2.6.5-7.282-smp X86_64 

	I searched the mailing Lists for other examples, but i didnt
find any Suggestions to solve this. 
	Thanks for help! 
	Regarding 
	Manuel Herr 


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