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<TITLE>Avoid Error Messages in /var/log/messages EMC CX300</TITLE>
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<P><FONT FACE="Arial">Hi there,</FONT>
<BR><FONT FACE="Arial">i get Error Messages in my logfiles when I boot the System and then, approx. every 10 Minutes, or during an hwinfo.</FONT>
<BR><FONT FACE="Arial">The Server is connected to an EMC CX 300 through 1 Qlogic HBA.</FONT>
<BR><FONT FACE="Arial">The Messages only appear for the failover Device. In my Example for /dev/sdh. </FONT>
</P>
<P><FONT FACE="Arial">#multipath -ld</FONT>
<BR><FONT FACE="Arial">sapdata (36006016040321900600487993216db11)</FONT>
<BR><FONT FACE="Arial">[size=133 GB][features="1 queue_if_no_path"][hwhandler="1 emc"]</FONT>
<BR><FONT FACE="Arial">\_ round-robin 0 [active]</FONT>
<BR><FONT FACE="Arial"> \_ 3:0:1:6 sdp 8:240 [active][ready]</FONT>
<BR><FONT FACE="Arial">\_ round-robin 0 [enabled]</FONT>
<BR><FONT FACE="Arial"> \_ 3:0:0:6 sdh 8:112 [active][ready]</FONT>
<BR><FONT FACE="Arial">*snip*</FONT>
</P>
<P><FONT FACE="Arial">#fdisk -l /dev/sdp</FONT>
<BR><FONT FACE="Arial">Disk /dev/sdp: 143.0 GB, 143034155008 bytes</FONT>
<BR><FONT FACE="Arial">255 heads, 63 sectors/track, 17389 cylinders</FONT>
<BR><FONT FACE="Arial">Units = cylinders of 16065 * 512 = 8225280 bytes</FONT>
</P>
<P><FONT FACE="Arial"> Device Boot Start End Blocks Id System</FONT>
<BR><FONT FACE="Arial">/dev/sdp1 1 17389 139677111 83 Linux</FONT>
</P>
<P><FONT FACE="Arial">#fdisk -l /dev/sdh</FONT>
<BR><FONT FACE="Arial">--> Generates this Error in /var/log/messages</FONT>
<BR><FONT FACE="Arial">Sep 27 12:17:44 saptf2 kernel: end_request: I/O error, dev sdh, sector 0</FONT>
<BR><FONT FACE="Arial">Sep 27 12:17:44 saptf2 kernel: Buffer I/O error on device sdh, logical block 0</FONT>
</P>
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<P><FONT FACE="Arial">Configuration:</FONT>
<BR><FONT FACE="Arial">/etc/multipath.conf</FONT>
<BR><FONT FACE="Arial">defaults {</FONT>
<BR><FONT FACE="Arial"> default_features "1 queue_if_no_path"</FONT>
<BR><FONT FACE="Arial">}</FONT>
</P>
<P><FONT FACE="Arial">multipaths {</FONT>
<BR><FONT FACE="Arial"> multipath</FONT>
<BR><FONT FACE="Arial"> {</FONT>
<BR><FONT FACE="Arial"> #mountpoint /sapdb/PF1/sapdata</FONT>
<BR><FONT FACE="Arial"> wwid 36006016040321900600487993216db11</FONT>
<BR><FONT FACE="Arial"> alias sapdata</FONT>
<BR><FONT FACE="Arial"> }</FONT>
<BR><FONT FACE="Arial">*snip* (some more aliases for other LUNs) *snip*</FONT>
<BR><FONT FACE="Arial">}</FONT>
<BR><FONT FACE="Arial">devices {</FONT>
<BR><FONT FACE="Arial"> device {</FONT>
<BR><FONT FACE="Arial"> vendor "DGC "</FONT>
<BR><FONT FACE="Arial"> product "*"</FONT>
<BR><FONT FACE="Arial"> path_grouping_policy group_by_prio</FONT>
<BR><FONT FACE="Arial"> getuid_callout "/sbin/scsi_id -g -u -s /block/%n"</FONT>
<BR><FONT FACE="Arial"> path_checker emc_clariion</FONT>
<BR><FONT FACE="Arial"> features "1 queue_if_no_path"</FONT>
<BR><FONT FACE="Arial"> hardware_handler "1 emc"</FONT>
<BR><FONT FACE="Arial"> failback immediate</FONT>
<BR><FONT FACE="Arial"> prio_callout "/sbin/mpath_prio_emc /dev/%n"</FONT>
<BR><FONT FACE="Arial"> no_path_retry 300</FONT>
<BR><FONT FACE="Arial"> }</FONT>
<BR><FONT FACE="Arial">}</FONT>
</P>
<P><FONT FACE="Arial">Loaded Modules:</FONT>
<BR><FONT FACE="Arial">dm_emc 23808 1</FONT>
<BR><FONT FACE="Arial">dm_round_robin 20480 1</FONT>
<BR><FONT FACE="Arial">dm_multipath 38800 3 dm_emc,dm_round_robin</FONT>
<BR><FONT FACE="Arial">dm_mod 77536 23 dm_multipath</FONT>
<BR><FONT FACE="Arial">qla2300 141696 0</FONT>
<BR><FONT FACE="Arial">qla2xxx 356192 33 qla2300</FONT>
</P>
<P><FONT FACE="Arial">#modinfo qla2300</FONT>
<BR><FONT FACE="Arial">version: 8.01.02-sles DBB4213CE377B7165AFB8AC</FONT>
</P>
<P><FONT FACE="Arial">#modinfo qla2xxx</FONT>
<BR><FONT FACE="Arial">version: 8.01.02-sles F6D31250031AEB3A3B9138A</FONT>
</P>
<P><FONT FACE="Arial">Kernel: </FONT>
<BR><FONT FACE="Arial">2.6.5-7.282-smp X86_64</FONT>
</P>
<P><FONT SIZE=2 FACE="Arial">I searched the mailing Lists for other examples, but i didnt find any Suggestions to solve this.</FONT>
<BR><FONT SIZE=2 FACE="Arial">Thanks for help!</FONT>
<BR><FONT SIZE=2 FACE="Arial">Regarding </FONT>
<BR><FONT SIZE=2 FACE="Arial">Manuel Herr</FONT>
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