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I have found the solution to my problem. I had to modify le line "filter" in the lvm.conf file.
I have put this :
filter = [ "r|/dev/cdrom|", "a|/dev/sda|", "r|/dev/sd.*|", "a|/dev/mapper/mpath.*|"...

I have seen this link.
I think that my problem is not in the multipath config but in the link between multipathing and the lvm layer.

I explain you my problem.

I create a lun on the server and...

hi
I tried to configure multipathing in ubuntu 12.04.
When I add new luns on the server, I show it with the multipath OK, but if I boot the server, I lost the multipath ( with dmsetup ls --tree, I...