[dm-devel] Re: multipath v0.4.5, nodes not appearing in /dev/

[andysayshi]

skimming thru the dm-devel archives , i came upon this, so it seems with
v0.4.5 the nodes are in /dev/mapper.

https://www.redhat.com/archives/dm-devel/2005-September/msg00064.html

that answered my question. : )

On 9/29/05, andysayshi <andysayshi at gmail.com> wrote:
>
> 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 at 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 at cc1-86 dev]#
>
> Now, originally we were running a previous version as a seperate admin
> mentioned here:
> https://www.redhat.com/archives/dm-devel/2005-August/msg00043.html , 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 at cc1-86 dev]# ls -l /dev|grep dm
> brw-r----- 1 root root 253, 0 Sep 29 13:11 dm-0
> [root at 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 at cc1-86 dev]#
>
> I've tried searching online for info, and i ran across this via
> http://christophe.varoqui.free.fr/wiki/wakka.php?wiki=FAQ :
>  5. I see my multipath nodes in /dev/mapper/ but not in /dev/ 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.
>
> # Commented out :
> # KERNEL="dm-[0-9]*", OPTIONS+="ignore_device"
> KERNEL="dm-[0-9]*", PROGRAM="/sbin/devmap_name %M %m", NAME="%k",
> SYMLINK="%c"
>
> 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.
>
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