multipath support ,initrd image and Red Hat V5.5

[aix tiger]

hi
 
I am working with an IBM storage to work with Red Hat enterprise Linux V5.5. I have been provided by IBM a special multipath.conf file which should replace the original multipath conf file in /etc directory.
 
Now as it is a SAN boot configuration , i think a new initrd image should be created with this new multipath file.
 
But question is how ? I tried mkinitrd command , but it is always failing. There is one initrd.elxx.img file present in /boot directory , but if i want to recreate this image file , what should be correct syntax for mkinitrd command for that purpose?
 
Regards

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