Hi People I just updated a CentOS 5.2 Server that is a Guest inside VMware ESX 3.50 Server using "yum update". As far as I can tell the only three packages were updated Jul 24 16:37:49 Updated: php-common - 5.1.6-20.el5_2.1.i386 Jul 24 16:37:50 Updated: php-cli - 5.1.6-20.el5_2.1.i386 Jul 24 16:37:50 Updated: php - 5.1.6-20.el5_2.1.i386 But when I rebooted the Server one of my Volume Groups VolGroup01 would not mount. By removing all references to VolGroup1 in /etc/fstab I was able to get a system that boots. Unfortunately I am not that familiar with LVM but using the following commands it looks like all the information about my logical volumes on VolGroup01 is gone is this correct? Is there likely to be any chance of recovering from this ? vgscan Reading all physical volumes. This may take a while... Found volume group "VolGroup01" using metadata type lvm2 Found volume group "VolGroup00" using metadata type lvm2 pvs --units=h PV VG Fmt Attr PSize PFree /dev/sda2 VolGroup00 lvm2 a- 9.88G 0 /dev/sda3 VolGroup00 lvm2 a- 90.00G 0 /dev/sdb1 VolGroup01 lvm2 a- 19.97G 19.97G lvdisplay --- Logical volume --- LV Name /dev/VolGroup00/LogVol00 VG Name VolGroup00 LV UUID cEWsVM-8M8w-0gWY-FFoh-bGLT-sf0M-sbosUD LV Write Access read/write LV Status available # open 1 LV Size 98.00 GB Current LE 3136 Segments 2 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:0 --- Logical volume --- LV Name /dev/VolGroup00/LogVol01 VG Name VolGroup00 LV UUID B8Y0UO-LATT-ohl2-kvfZ-bO1W-4cP8-3a6pVz LV Write Access read/write LV Status available # open 1 LV Size 1.88 GB Current LE 60 Segments 1 Allocation inherit Read ahead sectors auto - currently set to 256 Block device 253:1 Thank you for any advice you may have relating to this.