OCR backup file names become number strings

 I have been able to recover my 2-node RAC from SAN disks reformatted. Now I found one strange problem which puzzled me, it is the OCR backup:

[root@orarac1 ~]# ocrconfig -showbackup

orarac1     2011/04/21 12:15:35     /opt/oracle/webtech/product/crs/10.2.0.3/cdata/crs

orarac1     2011/04/21 08:15:32     /opt/oracle/webtech/product/crs/10.2.0.3/cdata/crs

orarac1     2011/04/21 04:15:30     /opt/oracle/webtech/product/crs/10.2.0.3/cdata/crs

orarac1     2011/04/20 00:15:13     /opt/oracle/webtech/product/crs/10.2.0.3/cdata/crs

orarac1     2011/04/11 16:13:07     /opt/oracle/webtech/product/crs/10.2.0.3/cdata/crs

[root@orarac1 ~]# ls -altr /opt/oracle/webtech/product/crs/10.2.0.3/cdata/crs
total 227468
drwxrwxr-x  4 oracle oinstall    4096 Jun  9  2008 ..
-rw-r--r--  1 oracle root       75324 Jun 10  2008 ocr_backup_06102008
-rw-r--r--  1 oracle root      117536 Jun 26  2008 ocr_backup_06262008
-rw-r--r--  1 oracle root     3047424 Mar 29 03:59 week.ocr