Commands Queued Output

[Randall Smith]

Sorry if this dups.  I didn't send in my confirmation in time, so the 
first attempt got rejected.

The following is a message I sent a while back to a list that no longer
exists.  The server discussed here crashed this morning with a kernel
panic and after a reboot the commands queued on Target 6 stands at 2.
The machine is a PowerEdge 2500 running Debian Sarge.  I don't know for
sure this is what caused the crash, but I'd like to understand it
regardless.  Any insight into what the Target 6 information means and
why it has a huge queue would be greatly appreciated.

Thanks.  -Randall

cat /proc/scsi/aic7xxx/0

is producing this output

---snip---
Target 5 Negotiation Settings
         User: 160.000MB/s transfers (80.000MHz DT, offset 127, 16bit)
Target 6 Negotiation Settings
         User: 160.000MB/s transfers (80.000MHz DT, offset 127, 16bit)
         Goal: 80.000MB/s transfers (40.000MHz, offset 32, 16bit)
         Curr: 80.000MB/s transfers (40.000MHz, offset 32, 16bit)
         Channel A Target 6 Lun 0 Settings
                 Commands Queued 26151289
                 Commands Active 0
                 Command Openings 1
                 Max Tagged Openings 0
                 Device Queue Frozen Count 0
---snip---

and I'm concerned because I don't know what it means.  I have a two disk
mirrored array setup.  I don't know what Target 6 is and why it has
commands queued or even what that means.  I'm guessing it isn't a good
thing.  Any help is appreciated.

--Randall

output of afacli:

AFA0> container list
Executing: container list
Num          Total  Oth Chunk          Scsi   Partition
Label Type   Size   Ctr Size   Usage   B:ID:L Offset:Size
----- ------ ------ --- ------ ------- ------ -------------
  0    Mirror 33.8GB            Valid   0:00:0 64.0KB:33.8GB
  /dev/sda             MIRROR_DWS       0:01:0 64.0KB:33.8GB

AFA0> disk list
Executing: disk list

B:ID:L  Device Type     Blocks    Bytes/Block Usage            Shared Rate
------  --------------  --------- ----------- ---------------- ------ ----
0:00:0   Disk            71132959  512         Initialized      NO     160
0:01:0   Disk            71132959  512         Initialized      NO     160

AFA0> disk show smart /all
Executing: disk show smart /all=TRUE

         Smart    Method of         Enable
         Capable  Informational     Exception  Performance  Error
B:ID:L  Device   Exceptions(MRIE)  Control    Enabled      Count
------  -------  ----------------  ---------  -----------  ------
0:00:0     Y            6             Y           N             0
0:01:0     Y            6             Y           N             0

AFA0> disk show defects 0
Executing: disk show defects (ID=0)

Number of PRIMARY defects on drive: 978

Number of GROWN defects on drive: 0

AFA0> disk show defects 1
Executing: disk show defects (ID=1)

Number of PRIMARY defects on drive: 112

Number of GROWN defects on drive: 0


result of lspci is

0000:01:02.1 RAID bus controller: Dell PowerEdge Expandable RAID
Controller 3/Di (rev 01)
0000:02:04.0 SCSI storage controller: Adaptec RAID subsystem HBA (rev 01)
0000:02:04.1 SCSI storage controller: Adaptec AIC-7899P U160/m (rev 01)
0000:03:06.0 SCSI storage controller: Adaptec AHA-3960D / AIC-7899A
U160/m (rev 01)
0000:03:06.1 SCSI storage controller: Adaptec AHA-3960D / AIC-7899A
U160/m (rev 01)