27  pvs
   28  pvcreate /dev/sdb
   29  pvcreate /dev/sdc
   30  pvs
   31  vgcreate ssd /dev/sdc
   32  vgcreate rust /dev/sdb
   33   lvcreate -L500G -T rust/data
   34  lvcreate -L500G -T ssd/data
   35  lvs
   36  lvs -a
   37  lvextend -L8G rust/data_tmeta
   38  lvextend -L8G ssd/data_tmeta
   39  lvextend -l+100%FREE ssd/data
   40  lvextend -l+100%FREE rust/data