Hi all, I'm wondering if anyone can help un-confuse me. =-) I've been through about every document I can find on the internet trying to chase down exactly how I'm supposed to configure devices for MPIO. I haven't seen the same answer twice. Everything is different. The most formal documentation I found was here: http://portal.suse.com/sdb/en/2005/04/sles_multipathing.html I've also been out to the multipath-tools resource page: http://christophe.varoqui.free.fr/ I really haven't gotten anything to work yet. =-) I also saw another issue addressed from this e-mail discussion board that said really all you need to do is uncomment some lines in /etc/multipath.conf and comment out some other lines and you're good to go. So, to clear things up with the device mapper piece of things. Is there any requirement of the multipath command that these devices have to be pre-built using dmsetup before multipath will recognize and built a path under /dev/dm-*? If so,...how do you setup two paths to one device in your target_file? What's confusing to me for setting up two devices in a "linear" fashion would seem like it's creating a concatenation of two separate devices instead of creating two paths to one device (i.e. "0 1028160 linear /dev/hda 0 1028160 3903762 linear /dev/hdb 0" from the dmsetup manpage). The only other options are to set them up as stripe or error devices. I'm not sure where to go next with this. I can see my two paths at /dev/sda and /dev/sdb. Whether I partition them or not, multipath won't pick anything up and display it with 'multipath -v2 -d' or 'multipath -l'. What I get from 'multipath -v2 -d' is an error like this: #multipath -v2 -d error calling out /bin/false error calling out /bin/false # Also, does multipathd or the multipath command itself update /etc/multipath.conf when multipath configures or recognizes a device,..or is it all a manual process? I can't say I've ever seen a device addressed like this before: 3600601607cf30e00184589a37a31d911 Coming from a Solaris background, I'm used seeing the WWNN and/or the WWPN. =-) I'm pretty new to the Linux world, so I understand that I'll have to get used to seeing things differently sometimes. Anyways, I'd appreciate any help anyone can offer. FYI, I'm running SLES 9 with SP2, multipath-tools 0.4.4 is installed, and I'm using a pair of Qlogic 2340 HBAs. The storage array controllers are configured as active/active. The Qlogic failover parameter is disabled due to my previous trials playing with mdadm's mpio features as well. Thanks, Dale Dale Fowle Seagate Technology Colorado Springs, CO 719-388-5584 -- dm-devel@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/dm-devel
