Looks like it may be FC related. the manual says that the Sense Key = 
0xb Errors are:

All 0xb sense key errors indicate that the disk drive aborted the 
command and that
the initiator may be able to recover by trying the command again.
Sense Key = 0xb Errors
TABLE 6
Asc Ascq Error Message Description
0x45 0x0 Select/Reselect
failure
This error implies that a parity error condition
0x47 0x0 SCSI Parity
occurred on the disk. This means that the disk
Error
has not received the FC packet correctly. The
possibile causes of a parity error condition
include:
1. The FC interface chip on one of the disks has
gone bad, resulting in FC frames being
corrupted (for example, a frame size error).
2. An internal circuit on one of the drives has
gone bad, resulting in the drive not being able
to sendor receive FC frames correctly. In this
situation, the drive receives data that does not
match the parity bit. The data is rejected and
an error is generated.
3. Some other component on the FC loop is
contributing to the noise on the loop, resulting
in this error.
It is difficult to identify the failing component
when a 0x47/0x0 error is found, because any
component on the FC loop might be the cause.
Consult a specialist for help when this error is
seen.
Note also that a 0x47/0x0 error may occur on
the host side of an array?that is, any component
on the FC loop on the host side may be causing
the problem. In this situation, consult a specialist
for help in identifying the failing component.


Viz. 
http://www.sun.com/products-n-solutions/hardware/docs/pdf/817-5918-10.pdf

Hope that helps.

Cheers!

--Chris



> Nbu 5.0 mp6 Solaris 9
>
> We have 2 NDMP drives that will not stay up. Is there a log that these 
> errors might get logged to that we can check? This is the sense error 
> we get form the NAS filer. But I wanted to know does netbackup also 
> log errors when drives will not stay up?
>
> 1503. 04/11/2006 17:12:10 0d00h08m36.91s CHK COND with Sense Key=0xB, 
> ASC=0x43, ASCQ=0x0 from SCSI LUN 3/0/1/0
> 1504. 04/11/2006 17:12:10 0d00h08m36.91s CHK COND with Sense Key=0xB, 
> ASC=0x43, ASCQ=0x0 from SCSI LUN 3/0/1/0
> 1505. 04/11/2006 17:12:10 0d00h08m36.91s CHK COND with Sense Key=0xB, 
> ASC=0x43, ASCQ=0x0 from SCSI LUN 3/0/1/0
> 1506. 04/11/2006 17:12:10 0d00h08m36.91s CHK COND with Sense Key=0xB, 
> ASC=0x43, ASCQ=0x0 from SCSI LUN 3/0/1/0
> 1507. 04/11/2006 17:14:05 0d00h10m31.74s CHK COND with Sense Key=0xB, 
> ASC=0x47, ASCQ=0x0 from SCSI LUN 3/0/1/0
>
>
> Greg
>
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