Hi, I have a host server running centos 7 and KVM for virtualization. i created a guest also running centos 7, and it works perfectly. however because my host server does not have a lot of space left on the drive, i added a second drive, on the host machine i typed virsh attach-disk centos7.0 /dev/sdb1 vdb and now on my guest server, i can see the second new drive. now to add this new drive to the / mount for /dev/centos/root i did the following: pvcreate /dev/vdb vgextend centos /dev/vdb (my lvm is called centos) lvextend -L+250G /dev/centos/root yum install xfsprogs.x86_64 --assumeyes xfs_growfs /dev/centos/root (I have to use this xfs, as centos 7 uses xfs and not ext3 or 4) everything worked great, i had 250 extra gb of space for my / mount i rebooted the guest server and it still worked great! however as soon as i rebooted the host server and tried to boot into the guest server, the server boots into emergency mode with the following error: buffer i/o error on device dm-2 logical block 73145654 any help would greatly be appreciated!