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[dm-devel] Multipath on boot and root partition with Redhat5.0


I have a SAN Eva 5000 HP And I have installed a redhat 5.0 on my server with "linux mpath", so far all is fine.
I have an os device multipathed as follow :

> multipath -ll
mpath0 () dm-0 COMPAQ,HSV110 (C)COMPAQ
\_ round-robin 0 [prio=0][active]
\_ 3:0:0:1 sdb 8:16  [active][ready]
\_ 4:0:0:1 sdc 8:32  [active][ready]

But when I presents a new lun to my host and scans again the scsi lun, I am losing the multipath on the disk (/ and /boot)
(possibly because the name of device is changed from sdb/sdc to sdc/sde ? )

Here's an extract of my multipath.conf:

multipath {
             wwid                    3600508b40000c1c50001c000000b0000
             path_grouping_policy    group_by_serial
             rr_weight               uniform
             prio_callout            /bin/true
             alias                   os_lun
But it's seems that on boot the mutlipath.conf file is not read. Am I right?
When the system is booted, multipathd cannot use the boot device ...
What can I do to fix the boot device name persistence? Where is supposed to be configuration file that defines the multipath options of the boot device ?

Right now, the server can boot because my fstab is like this:
LABEL=/1 / LABEL=/boot /boot

Thanks you for your help

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