<html xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" xmlns:x="urn:schemas-microsoft-com:office:excel" xmlns:p="urn:schemas-microsoft-com:office:powerpoint" xmlns:a="urn:schemas-microsoft-com:office:access" xmlns:dt="uuid:C2F41010-65B3-11d1-A29F-00AA00C14882" xmlns:s="uuid:BDC6E3F0-6DA3-11d1-A2A3-00AA00C14882" xmlns:rs="urn:schemas-microsoft-com:rowset" xmlns:z="#RowsetSchema" xmlns:b="urn:schemas-microsoft-com:office:publisher" xmlns:ss="urn:schemas-microsoft-com:office:spreadsheet" xmlns:c="urn:schemas-microsoft-com:office:component:spreadsheet" xmlns:odc="urn:schemas-microsoft-com:office:odc" xmlns:oa="urn:schemas-microsoft-com:office:activation" xmlns:html="http://www.w3.org/TR/REC-html40" xmlns:q="http://schemas.xmlsoap.org/soap/envelope/" xmlns:D="DAV:" xmlns:mt="http://schemas.microsoft.com/sharepoint/soap/meetings/" xmlns:x2="http://schemas.microsoft.com/office/excel/2003/xml" xmlns:ois="http://schemas.microsoft.com/sharepoint/soap/ois/" xmlns:dir="http://schemas.microsoft.com/sharepoint/soap/directory/" xmlns:ds="http://www.w3.org/2000/09/xmldsig#" xmlns:dsp="http://schemas.microsoft.com/sharepoint/dsp" xmlns:udc="http://schemas.microsoft.com/data/udc" xmlns:xsd="http://www.w3.org/2001/XMLSchema" xmlns:sub="http://schemas.microsoft.com/sharepoint/soap/2002/1/alerts/" xmlns:ec="http://www.w3.org/2001/04/xmlenc#" xmlns:sp="http://schemas.microsoft.com/sharepoint/" xmlns:sps="http://schemas.microsoft.com/sharepoint/soap/" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:udcs="http://schemas.microsoft.com/data/udc/soap" xmlns:udcxf="http://schemas.microsoft.com/data/udc/xmlfile" xmlns:udcp2p="http://schemas.microsoft.com/data/udc/parttopart" xmlns:wf="http://schemas.microsoft.com/sharepoint/soap/workflow/" xmlns:dsss="http://schemas.microsoft.com/office/2006/digsig-setup" xmlns:dssi="http://schemas.microsoft.com/office/2006/digsig" xmlns:mdssi="http://schemas.openxmlformats.org/package/2006/digital-signature" xmlns:mver="http://schemas.openxmlformats.org/markup-compatibility/2006" xmlns:m="http://schemas.microsoft.com/office/2004/12/omml" xmlns:mrels="http://schemas.openxmlformats.org/package/2006/relationships" xmlns:spwp="http://microsoft.com/sharepoint/webpartpages" xmlns:ex12t="http://schemas.microsoft.com/exchange/services/2006/types" xmlns:ex12m="http://schemas.microsoft.com/exchange/services/2006/messages" xmlns:pptsl="http://schemas.microsoft.com/sharepoint/soap/SlideLibrary/" xmlns:spsl="http://microsoft.com/webservices/SharePointPortalServer/PublishedLinksService" xmlns:Z="urn:schemas-microsoft-com:" xmlns:st="" xmlns="http://www.w3.org/TR/REC-html40"> <head> <meta http-equiv=Content-Type content="text/html; charset=us-ascii"> <meta name=Generator content="Microsoft Word 12 (filtered medium)">  <style>  </style>  </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1> I actually tried doing that by doing a mkinitrd /boot/initrdfile –preload=scsi_dh_rdac kernelversion and booted using the initrd and it still seemed to crank out quite a few errors. With doing it this way, should I still expect to see a good deal of I/O errors or should they pretty sparse?<o:p></o:p> <o:p> </o:p> <div> <div style='border:none;border-top:solid #B5C4DF 1.0pt;padding:3.0pt 0in 0in 0in'> From: dm-devel-bounces@redhat.com [mailto:dm-devel-bounces@redhat.com] On Behalf Of Moger, Babu Sent: Tuesday, April 14, 2009 11:38 AM To: device-mapper development Subject: [dm-devel] RE: Dell MD3000i issues with dm mp<o:p></o:p> </div> </div> <o:p> </o:p> Yes, this could happen during the boot where the scsi_dh_rdac handler is not yet loaded. You might want to try adding scsi_dh_rdac in the initrd. This will help to cut short all your error messages. I don’t see any problem with your multipath.conf. <o:p></o:p> <o:p></o:p> <div> Thanks<o:p></o:p> Babu Moger <o:p></o:p> </div> <div> <div class=MsoNormal align=center style='text-align:center'> <hr size=2 width="100%" align=center> </div> From: dm-devel-bounces@redhat.com [mailto:dm-devel-bounces@redhat.com] On Behalf Of Kurt Bechstein Sent: Tuesday, April 14, 2009 9:54 AM To: dm-devel@redhat.com Subject: [dm-devel] Dell MD3000i issues with dm mp<o:p></o:p> </div> <o:p> </o:p> Greetings everyone, I have a RHEL 5.3 host attached to two Dell MD3000i storage arrays via iscsi. I’m having some interesting issues upon bootup in this setup. Between the two arrays I’m accessing 24 luns so after my iscsi service kicks in I get tons and tons of I/O error messages going across the screen. This can go on for 15-20 minutes or longer. It would appear that some I/O is being sent to the passive paths and they are returning errors. It would seem the scsi layer is doing its thing to scan for partitions and probably causing the I/O that is being seen. Is there any way to suppress/avoid this scenario? Also, I thought I would post my multipath.conf file just to have some other eyes have a look at it and make sure I’m not missing something obvious so that is below. Thanks in advance!<o:p></o:p> <o:p> </o:p> <o:p> </o:p> devices {<o:p></o:p> device {<o:p></o:p> vendor "DELL"<o:p></o:p> product "MD3000i"<o:p></o:p> features "0"<o:p></o:p> getuid_callout "/sbin/scsi_id -g -u -s /block/%n"<o:p></o:p> prio_callout "/sbin/mpath_prio_rdac /dev/%n"<o:p></o:p> hardware_handler "1 rdac"<o:p></o:p> path_grouping_policy group_by_prio<o:p></o:p> failback immediate<o:p></o:p> path_checker rdac<o:p></o:p> prio "rdac"<o:p></o:p> <o:p> </o:p> }<o:p></o:p> }<o:p></o:p> multipaths {<o:p></o:p> mulitpath {<o:p></o:p> device {<o:p></o:p> vendor DELL<o:p></o:p> product MD3000i<o:p></o:p> }<o:p></o:p> }<o:p></o:p> }<o:p></o:p> </div> </body> </html>