geom_journal - bio_flush not supported on disks connected via usb?

Hiho! :-)


During startup, I got this error (only once):


GEOM_JOURNAL: Journal 1159150689: da0 contains data.
GEOM_JOURNAL: Journal 1159150689: da0 contains journal.
GEOM_JOURNAL: Journal da0 clean.
(da0:umass-sim0:0:0:0): SYNCHRONIZE CACHE. CDB: 35 0 0 0 0 0 0 0 0 0 
(da0:umass-sim0:0:0:0): CAM Status: SCSI Status Error
(da0:umass-sim0:0:0:0): SCSI Status: Check Condition
(da0:umass-sim0:0:0:0): ILLEGAL REQUEST asc:20,0
(da0:umass-sim0:0:0:0): Invalid command operation code
(da0:umass-sim0:0:0:0): Unretryable error
GEOM_JOURNAL: BIO_FLUSH not supported by da0.


da0 is 250GB usb disk (using ehci(4)).

I do not understand completely what this means. Has the BIO_FLUSH
command only failed once and works now on subsequent tries?

Does BIO_FLUSH never work, because it's not implemented (or can't be
implemented) for disks connected via usb? And if thats the case, will
that affect geom_journal in any way? Is my data still being journalled
correctly? :-)


FreeBSD blah.blah 7.0-CURRENT FreeBSD 7.0-CURRENT #3: Mon Jul 30
10:12:24 CEST 2007


dmesg excerpt:

da0 at umass-sim0 bus 0 target 0 lun 0
da0: <WD 2500BB External 0108> Fixed Direct Access SCSI-0 device 
da0: 40.000MB/s transfers
da0: 238475MB (488397168 512 byte sectors: 255H 63S/T 30401C)



Thanks in advance!


Bye
Marc



-- 

"Come away, O human child!
To the waters and the wild
With a faery, hand in hand,
For the world's more full of weeping than you can understand."

W.B. Yeats, The Stolen Child