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

[xiangyong ouyang]

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!