blocksize changed during write

[Johan Ekenberg]

After crashes I see a lot of these messages (RAID5):

www3 kernel: ll_rw_block: device 09:00: only 4096-char blocks implemented
(1024)
www3 last message repeated 226 times
www3 kernel: md0: blocksize changed during write

What do they actually mean?
The first one (only 4096-char blocks implemented)
totally fills my dmesg output.

/Johan Ekenberg