Redologs with 4K Blocksize

Hello,
we are unable to create Redologs with 4k Blocksize.
Following system:
HP-UX 11.31
Oracle 11.2.0.3
NetApp Storage system

Filesystem is setup with 4K Blocksize

gdwprod:/u73/oradata1/GDAP/logA # /usr/sbin/fstyp -v /dev/vg_ora_gdap_log/lv_logAGDAP
vxfs
version: 7
f_bsize: 8192
f_frsize: 4096
f_blocks: 13103104
f_bfree: 11546234
f_bavail: 11365825
f_files: 2886576
f_ffree: 2886544
f_favail: 2886544
f_fsid: 1073872899
f_basetype: vxfs
f_namemax: 254
f_magic: a501fcf5
f_featurebits: 0
f_flag: 16
f_fsindex: 9
f_size: 13103104

But statement to create redolog throws error:

SQL> ALTER DATABASE ADD LOGFILE GROUP 17 ( '/u73/oradata1/GDAP/logB/redo17.log') SIZE 1024000K blocksize 4096;
ALTER DATABASE ADD LOGFILE GROUP 17 ( '/u73/oradata1/GDAP/logB/redo17.log') SIZE 1024000K blocksize 4096