[dm-devel] persistent device names on rhel4

[lnx dm]

I am using multipathing on rhel4 u3 x86_64 with
EVA4000 and HSV200 controller.

I had a few questions:

1. lsmod shows the below modules 

dm_mirror              29017  0
dm_round_robin          4929  1
dm_multipath           21841  2 dm_round_robin
dm_mod                 67457  9 dm_mirror,dm_multipath

Do need to insert "multipath" module also ?
If yes then what it is for ?

without using multipath module I can see multiple
paths in multipath -v2 -l output

2. How do I ensure that the same device gets mounted
across reboots ?
I verified that across the reboots mpath6 refers to
the same device, wwid is same for mpath6 across
reboots

# multipath -v2 -l
mpath6 (3600805f300176640a435a927359c0003)
[size=440 GB][features="0"][hwhandler="0"]
\_ round-robin 0 [active]
 \_ 2:0:0:1     sdag 66:0   [active][ready]
 \_ 0:0:0:1     sda  8:0    [active][ready]

I have /dev/mapper/mpath6 in /etc/fstab and it works
correctly.

# ls -l /dev/mpath/mpath6
lrwxrwxrwx  1 root root 7 Jul 18 06:13
/dev/mpath/mpath6 -> ../dm-6

What is the difference if I use /dev/dm-6 ?

which will be better ?

Thanks.

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