<html xmlns:o="urn:schemas-microsoft-com:office:office" xmlns:w="urn:schemas-microsoft-com:office:word" 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 11 (filtered medium)"> <style>  </style> </head> <body lang=EN-US link=blue vlink=purple> <div class=Section1> Hi,<o:p></o:p> With latest RHEL 4 DM modules and user space tools, when the Storage controller is rebooted and if “multipath –ll” is executed, the command is hung for a while (because of retries) and outputs the following status:<o:p></o:p> <o:p> </o:p> 3600508b400102a990000100000710000<o:p></o:p> [size=4 GB][features="0"][hwhandler="0"]<o:p></o:p> \_ round-robin 0 [enabled]<o:p></o:p> \_ 0:0:0:3 sdc 8:32 [faulty][active]<o:p></o:p> \_ 1:0:0:3 sdi 8:128 [faulty][active]<o:p></o:p> \_ round-robin 0 [enabled]<o:p></o:p> \_ 0:0:1:3 sdf 8:80 [faulty][active]<o:p></o:p> \_ 1:0:1:3 sdl 8:176 [ready ][failed]<o:p></o:p> <o:p> </o:p> IO is not exercised during the above test. I have tested the same by changing the Qlogic parameters for increasing the timeout/retry values. The following are the various options used for testing. Each line below have the Qlogic options which are used for building initrd images.<o:p></o:p> <o:p> </o:p> options qla2xxx ql2xretrycount=40 <o:p></o:p> options qla2xxx ql2xretrycount=60<o:p></o:p> options qla2xxx qlport_down_retry=10 ql2xretrycount=60<o:p></o:p> <o:p> </o:p> There is not much change in the time taken for executing “multipath –ll” command. Just that the command is hung for 40-60 sec.<o:p></o:p> <o:p> </o:p> If we have longer retry counts and if the controller takes less time like a minute to reboot, the status should have been updated as the contoller is back online within that time. But in the subsequent path verification daemon (multipathd) the path status gets updated properly. <o:p></o:p> <o:p> </o:p> The problem is when IO is running on these devices, after the controller reboots, <o:p></o:p> <o:p> </o:p> “dd” reports - <o:p></o:p> <o:p> </o:p> dd: reading `/dev/3600508b400102a990000100000710000’: Input/output error <o:p></o:p> <o:p> </o:p> This continues till the next path verification is done. Attached is the log file.<o:p></o:p> <o:p> </o:p> Why does the status not updated correctly? How should I be setting the HBA (Qlogic in my case) for retry counts and command timeouts ?<o:p></o:p> <o:p> </o:p> Thanks and regards<o:p></o:p> -Murthy<o:p></o:p> <o:p> </o:p> </div> </body> </html>