[Lustre-discuss] Debugging Lustre Client

[Jack David]

Hi All,

I want to print the tracing information on the lustre client. I tried
enabling the debugging information using

sysctl -w lnet.printk=-1

And then I am using

lctl debug_kernel <file_name>

to print the debugging log into a file.

I am mainly interested in the traces of LLITE and OSC. But I managed
to get theses traces only once. If I do "lctl debug_kernel" for next
runs, I am not getting calls made from osc_request.c files or
llite/file.c for any read/write.

I did "lctl clear" before running any read/write command (mainly "cp")
on lustre mount. Am I doing anything wrong?

Also, there are many LDLM message which I want to omit. Is there any
way to suppress LDLM messages?

Thanks,
J
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[Artem Blagodarenko]

Hi!

For getting filtered messages not only once you can do next steps:

1) sysctl -w lnet.printk=-1
2) #lctl debug_daemon start path_to_not_filtered_file
This enables debug capturing to specified file.
3) make needed actions
4) lctl debug_daemon stop
5) Configure filter with "show" and "filter" lctl's commands (you can get subsystems with "lctl debug_list subs"
for example, next commands filter all messages except lent
#lctl filter all_subs
#lctl show lent
6) filter you debug messages
#lctl debug_file path_to_not_filtered_file path_to_filtered_file

You can reconfigure filters in the way you want and call again.
#lctl debug_file path_to_not_filtered_file path_to_filtered_file

I hope I understand your question right way.

Best regards,
Artem Blagodarenko.