just found this:

http://forum.proxmox.com/threads/17306-New-3-10-0-Kernel

Quote Originally Posted by NStorm  View Post
Seems like it fails to start, because it tries to initialize LVM and RAID 
before AHCI devices are probed. When I've manually activate them with 'lvchange 
-a a pve' and Ctrl+D out of emergency shell the system finally booted. Will try 
to play with rootdelay kernel param later.
Yep, it looks as though the same holds for my sas2008i based server too. LVM 
initialization happens prior to first messages about sda.

'lvm vgchange -a y'
brings all the volumes online.

The fix for scsi users is to change the line in /etc/default/grub:
GRUB_CMDLINE_LINUX_DEFAULT
and add "scsi_mod.scan=sync"


----- Mail original ----- 

De: "Alexandre DERUMIER" <[email protected]> 
À: "alex.lu" <[email protected]> 
Cc: "pve-devel" <[email protected]> 
Envoyé: Vendredi 25 Avril 2014 11:37:20 
Objet: Re: [pve-devel] rhel7 rc kernel source 

>>yes, there is no lvs(pve-root/pve-data/pve-swap) in /dev/mapper 

Ok, I see /dev/sda .. so it's not related to perc driver ! 

seem to be a lvm problem 

can you try: 

#pvdisplay 
#pvscan 


----- Mail original ----- 

De: "alex.lu" <[email protected]> 
À: "Alexandre DERUMIER" <[email protected]> 
Cc: "pve-devel" <[email protected]>, "Dietmar Maurer" 
<[email protected]> 
Envoyé: Vendredi 25 Avril 2014 10:24:07 
Objet: Re: [pve-devel] rhel7 rc kernel source 






can you do an "ls /dev/" from the hanging initramfs ? 



yes, there is no lvs(pve-root/pve-data/pve-swap) in /dev/mapper 


http://mirrors.verycloud.cn/images/ramfsdev.png 
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