BIO_FLUSH and BBWC

[Toomas Aas]

Hello!

Using FreeBSD 7.0-BETA2 I created some UFS+gjournal filesystems on IBM 
ServeRAID 8k (aac) controller. When the filesystem is being mounted, I get 
this message:

GEOM_JOURNAL: BIO_FLUSH not supported by aacd1s2

OK, so aac driver doesn't support BIO_FLUSH. Is my understanding correct 
that BIO_FLUSH is the request that tells the controller to flush its cache, 
or is it about flushing some other cache?

If it is controller cache that can't be flushed, then am I correct in 
thinking that if my controller has battery-backed cache then this is 
actually not a major concern?

Another message that I don't understand which happens when mounting the FS 
is this:

WARNING: Expected rawoffset 0, found 514080

-- 
Toomas Aas