[Lustre-discuss] what are the meanings of collectl output for lustre

[Cliff White]

xiangyong ouyang wrote:
> hi all,
> 
> I'm running collectl to get profiling information about lustre.  I'm
> using lustre   "2.6.18-53.1.13.el5_lustre.1.6.4.3smp", and
> collectl V3.1.1-5 (zlib:1.42,HiRes:1.86)
> 
> Basically I want to see the metadata information on both client and MDS.
> 
> On client side, I run:   "collectl -sL  --lustopts M":
> # LUSTRE CLIENT DETAIL (/sec): METADATA
> #Filsy   KBRead  Reads SizeKB  KBWrite Writes SizeKB  Open Close GAttr
> SAttr  Seek Fsync DrtHit DrtMis
> datafs        0      0      0        0      0      0     3     0     0
>     0     0     0      0      0
> datafs        0      0      0    50169   3915     12     0     3     0
>     0     0     0   3912  12543
> datafs        0      0      0        0      0      0     0     0     0
>     0     0     0      0      0
> 
> What are the fileds "DrtHit" and "DrtMis" here?
> 
> But On MDS side, when I run
> [wci70-oib:~/tools]collectl -sL
> Error: -sL only applies to MDS services when used with --lustopts D
> type 'collectl -h' for help
> 
> Then I run:
> [wci70-oib:~/tools]collectl -sL --lustopts D
> Error: --lustopts D only applies to HP-SFS
> type 'collectl -h' for help
> 
> I want to see more detailed metadata information at MDS side, such as
> locks, cache hit/miss.  What are the options to do that on MDS?
> Thanks very much!

I would consult the Lustre manual. Some of this information is available 
  under /proc on the MDS, you can also enable lock tracing through the 
Lustre debug flags.
cliffw

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