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lvs outputs "[$lvname_vorigin]" for the virtual snapshot lv (created with "--virtualsize"), and the original device pointed by "$lvname_vorigin" is just for lvm internal use, one should never use it. Per lvm's nameing rules, "[" is not valid as part of the vg/lv name. (man 8 lvm). <quote> VALID NAMES The following characters are valid for VG and LV names: a-z A-Z 0-9 + _ . - VG and LV names cannot begin with a hyphen. There are also various reserved names that are used internally by lvm that can not be used as LV or VG names. A VG cannot be called anything that exists in /dev/ at the time of creation, nor can it be called '.' or '..'. A LV cannot be called '.' '..' 'snapshot' or 'pvmove'. The LV name may also not con‐ tain the strings '_mlog' or '_mimage' </quote> So we can skip the set the lv's backingStore by checking if the name begins with a "[".