Re: weird messages in blktrace pertaining to manor and minor

["Alan D. Brunelle" <Alan.Brunelle@hp.com>]

On Thu, 2009-07-30 at 18:24 +0530, Srinivasa R Chamarthy wrote:
> 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.
> 

What Linux version are you using? Issues in MD/DM mappings were fixed in
kernels post-RHEL5/SLES10 for example. 

Alan