Here is a update on my situation. I downloaded the md-mp patch and tried to apply it to the Red Hat kernel source 2.4.9-27enterprise kernel, this did not patch correctly. I then downloaded the 2.4.22 kernel and applied with success. The box now fails over in a matter of seconds instead of minutes it still doesn't failback but that's no big deal. My next question is how can I apply this patch to the red hat supplied kernel 2.4.9-27 enterprise so I will still have red hat support on this kernel? Also is there away with this patch applied to get failback? Thanks, Doug >>> Lars Marowsky-Bree <lmb@suse.de> 09/11/03 03:43AM >>> On 2003-09-10T18:55:41, Doug Griswold <griswld@cio.sc.gov> said: > Alright I got md/multipath to failover with 2 emulex hba's on red hat > advanced server 2.1 kernel version 2.4.9-27enterprise. My next new > problem is that it took five minutes to fail over from when I yanked one > of the fibre channel cables. Where could this timeout come from? I > have tried several times but each time it takes 5 minutes to failover. > Also it won't failback. Any ideas out there. The plain md multipath can't do failback automatically. People's opinion on whether that is a good idea do differ ;-) The timeout is the time needed until the damn (sorry) Linux Kernel SCSI layers give up retrying and then pass the error code up to md for handling. You can maybe try tuning some emulex parameters to fix that. If you want load balancing for the md multipath, you could try checking out my patch at ftp://ftp.suse.com/pub/people/lmb/md-mp/ vs 2.4, it adds some features to md and also makes it quite a bit more robust. Sincerely, Lars Marowsky-Brée <lmb@suse.de> -- High Availability & Clustering ever tried. ever failed. no matter. SuSE Labs try again. fail again. fail better. Research & Development, SuSE Linux AG -- Samuel Beckett - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html - To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
