lvresize -r + long uptime + reboot = lost Volume Group ?

Hello,

I have recently experienced the same problem on two RHEL servers : after 
a clean shutdown of the system, the LVM Volume Group holding the root 
(/) partition is lost.

Each time I was able to recover the configuration by restoring the 
“/etc/lvm/backup/vgname” file from my backup software and executing a 
“vgcfgrestore” command from a Live CD.

The servers are in version 5.11 (uptime : 7 months) and 6.6 (uptime : 2 
months), both 64 bits.

They have a few things in common :

  - VMware 5.5 virtual machines

  - Only using RDM storage (no VMDK)

  - Physical Volumes were created directly on the disk (e.g. /dev/sdd), 
not on a classic partition with the LVM flag

  - /boot was located on a non-LVM ext2 partition (1GB disk)

  - The root partition was at one point increased online with the 
command “lvresize -r -l +100%FREE vgname/lvname”

Has anybody seen this problem before ? Does it means that I need to 
restart the server after an online resize of the root partition ? Can 
this be caused by a kernel or lvm2 update ?

Thanks for your help,

Nicolas

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