weird messages in blktrace pertaining to manor and minor numbers

[Srinivasa R Chamarthy <schamart@linux.vnet.ibm.com>]

Hello,

I am running blktrace against scsi disks on linux. I get the
following output which i am not able to infer some of the messages
in it.

2057,8440  1     8043     0.580951687  2047  A   W 14666 + 1 <-
(253,0) 14666
  8,0    1     8044     0.580951812  2047  Q   W 14666 + 1
[mkfs.ext3]
  8,0    1     8045     0.580952000  2047  M   W 14666 + 1
[mkfs.ext3]
2057,8440  1     8046     0.580953656  2047  A   W 14667 + 1 <-
(253,0) 14667
  8,0    1     8047     0.580953781  2047  Q   W 14667 + 1
[mkfs.ext3]
  8,0    1     8048     0.580953968  2047  M   W 14667 + 1
[mkfs.ext3]
2057,8440  1     8049     0.580955406  2047  A   W 14668 + 1 <-
(253,0) 14668
  8,0    1     8050     0.580955718  2047  Q   W 14668 + 1
[mkfs.ext3]

For some of the lines, it shows the list of major and minor numbers
(2057,8440) which are not there applicable to my system. I am not
able to understand the output pertaining to these numbers and i do
not find any documentation about them. Can anybody let me know what
this output means?

I have run blktrace as following:

blktrace -d /dev/sda /dev/sdb -o - | blkparse -i -

and ran mkfs.ext3 to the scsi disks.

-- 
Srinivasa R Chamarthy (schamart@linux.vnet.ibm.com)