I am trying to simulate file system super block corruption. During this experiment I could not understand the difference between below super block corruption. Please help to know the difference. A DRBD device drbd1 is created on top of LV (Ex: LV1)Filesystem is created on top of DRBD device.VG -> LV -> DRBD -> Ext3 FS1) dd if=/dev/zero of=/dev/VG1/LV1 count=1 bs=40962) dd if=/dev/zero of=/dev/drbd1 count=1 bs=4096Is there any difference between above two commands? My understanding is that we should not use 1) command to corrupt the filesystem, if at all FS(filesystem) is created and associated with drbd.Please help to understand. 
correct method to corrupt super block in ext3 filesystem associated with drbd
linux;filesystems;lvm;ext3;drbd