Hypervisor are in Up state but Data center shows as inactive. All the VM´s in the data center are down.

Issue

Hypervisor are in Up state but Data center shows as inactive. All the VM´s in the data center are down.

There were some maintenance work done on the storage. Whole RHEV environment was brought down before the maintenance work.

Before shutting down the server :

[root@host ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/live-rw   1.3G  369M  879M  30% /
/dev/mapper/HostVG-Config
                      7.8M  1.3M  6.1M  18% /config
tmpfs                  95G   12K   95G   1% /dev/shm
/dev/mapper/3600300570117770019e56169c63e31c3p3
                      237M  152M   73M  68% /dev/.initramfs/live
10.209.134.178:/ISO    25G  7.3G   17G  32% /rhev/data-center/mnt/10.209.134.178:_ISO
/dev/mapper/a20a5700--6ae8--4885--b97f--915b6f0e5f8e-master
                    1008M   34M  924M   4% /rhev/data-center/mnt/blockSD/a20a5700-6ae8-4885-b97f-915b6f0e5f8e/master

After starting up the Hypervisor :

root@host ~]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/live-rw   1.3G  369M  879M  30% /
/dev/mapper/HostVG-Config
                      7.8M  1.3M  6.1M  18% /config
tmpfs                  95G     0   95G   0% /dev/shm
/dev/mapper/3600300570117770019e56169c63e31c3p3
                      237M  152M   73M  68% /dev/.initramfs/live

/dev/mapper/a20a5700--6ae8--4885--b97f--915b6f0e5f8e-master 1008M 34M 924M 4% /rhev/data-center/mnt/blockSD/a20a5700-6ae8-4885-b97f-915b6f0e5f8e/master gone missing after the reboot..