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

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

#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

defaults {
        default_features "1 queue_if_no_path"

multipaths {
                #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

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!
Manuel Herr

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