Worrisome or no?

[Warner Losh]

I think I have something wrong with my system.  I'm not sure what, and
am trying to diagnose it.  I have a 19190 card with one drive on it.
The drive is connected via a cable that's believed good, through an
SCA adapter that's likely believed to be good to a 36GB drive that's
wide Ultra (40MB/s):

da0 at ahc0 bus 0 target 0 lun 0
da0: <FUJITSU MAF3364L SUN36G 1213> Fixed Direct Access SCSI-2 device 
da0: 40.000MB/s transfers (20.000MHz, offset 63, 16bit), Tagged Queueing Enabled
da0: 34732MB (71132959 512 byte sectors: 255H 63S/T 4427C)


Every so often (once every few hours) I'm getting the following in
dmesg:

(da0:ahc0:0:0:0): parity error detected in Data-in phase. SEQADDR(0x1a7) SCSIRATE(0x95)
(da0:ahc0:0:0:0): READ(10). CDB: 28 0 2 81 97 c7 0 0 80 0 
(da0:ahc0:0:0:0): CAM Status: SCSI Status Error
(da0:ahc0:0:0:0): SCSI Status: Check Condition
(da0:ahc0:0:0:0): ABORTED COMMAND asc:48,0
(da0:ahc0:0:0:0): Initiator detected error message received
(da0:ahc0:0:0:0): Retrying Command (per Sense Data)

What do these indicate?  A bad path to disk?  A bad disk?  A bad
controller?  Space alien fucking with me?

Warner