multipath version: multipath v0.4.5 (16/06, 2005) kernel: Linux 2.6.9-22.ELsmp #1 SMP Mon Sep 19 18:32:14 EDT 2005 os: Red Hat Enterprise Linux ES release 4 (Nahant Update 2) Hello, Im new to multipath/devicemapper, so please excuse any misterminology or misunderstanding on my part : ) Basically, if i start up the multipathd service and run multipath to scan for devices, it finds (as it's supposed to) and emc entry (which i defined in /etc/multipath.conf). [root@cc1-86 dev]# multipath -v2 -l emc1 (36006016046861000625964d94cbbd911) [size=133 GB][features="0"][hwhandler="1 emc"] \_ round-robin 0 [active] \_ 1:0:0:0 sdb 8:16 [active] \_ 2:0:0:0 sdd 8:48 [active] \_ round-robin 0 [enabled] \_ 1:0:1:0 sdc 8:32 [active] \_ 2:0:1:0 sde 8:64 [active] [root@cc1-86 dev]# Now, originally we were running a previous version as a seperate admin mentioned here: <a href="https://www.redhat.com/archives/dm-devel/2005-August/msg00043.html">https://www.redhat.com/archives/dm-devel/2005-August/msg00043.html</a> , after lots of back and forth for this and other issues, our redhat support instructed us to use a updated version of multipath (ver listed above). back on the previous version (v0.4.4), i would be able to find the multipath node in /dev so that i could mount it. but now, i dont see anything in /dev, i do however see entries in /dev/mapper: [root@cc1-86 dev]# ls -l /dev|grep dm brw-r----- 1 root root 253, 0 Sep 29 13:11 dm-0 [root@cc1-86 dev]# ls -l /dev/mapper/ total 0 crw------- 1 root root 10, 63 Sep 29 09:08 control brw-rw---- 1 root disk 253, 0 Sep 29 13:11 emc1 [root@cc1-86 dev]# I've tried searching online for info, and i ran across this via <a href="http://christophe.varoqui.free.fr/wiki/wakka.php?wiki=FAQ">http://christophe.varoqui.free.fr/wiki/wakka.php?wiki=FAQ</a> : <h3> 5. I see my multipath nodes in /dev/mapper/ but not in /dev/ </h3> Verify you have a naming rule configured in udev *and* no bypass rule for dm-* devices. The naming rule may use dmsetup or multipath-tools'-provided devmap_name. <tt> # Commented out : # KERNEL="dm-[0-9]*", OPTIONS+="ignore_device" KERNEL="dm-[0-9]*", PROGRAM="/sbin/devmap_name %M %m", NAME="%k", SYMLINK="%c" </tt> Partition mapping through kpartx won't work unless devices appear in /dev/. Can someone tell me if this is what I need to do as well? If so, where would this file be located, so that I can update it? Thanks in advance, Andy.